Bang & Olufsen Beovox MS150 (DENMARK 1981)
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The Beovox MS150 loudspeakers were designed with Bang & Olufsen’s Uni-Phase technology, ensuring linear phase and amplitude response for exceptionally accurate, distortion-free sound. Built to deliver true high-fidelity performance, the MS150 reproduces every detail of your music exactly as intended. With a 150W RMS power rating and an advanced overload protection circuit, these speakers confidently handle high listening levels. Their performance is the result of B&O’s integrated loudspeaker design approach, combining Fourier analysis, computer-aided simulation, and laser holography to refine cabinet resonance control, crossover precision, and driver integration. The MS150 features a monitor-grade subwoofer, an 8-inch bass driver, and a 64-litre cabinet, producing deep, clean, and powerful low frequencies. A 3-inch dome midrange—aperiodically tuned for optimal accuracy—delivers lifelike vocals, while the dedicated super tweeter ensures outstanding high-frequency clarity. Perfectly balanced across the full audio spectrum, the Beovox MS150 excels with all music genres, from delicate acoustic passages to dynamic, high-energy recordings. These speakers pair beautifully with the Beolab 8000 system and other premium hi-fi setups.
Specifications: RMS power handling: 150W | Impedance: 8ohm | Subwoofer: 25cm | Woofer: 21cm | Phase-link unit: 7,5 cm dome | Tweeter: 2,5cm dome | Dimensions: 36 × 83.5 × 34 cm | Weight: 30kg | Original sale price in Germany: 1400 DM per piece | Finish: Rosewood, White |
Designer: Jakob Jensen
Specifications: RMS power handling: 150W | Impedance: 8ohm | Subwoofer: 25cm | Woofer: 21cm | Phase-link unit: 7,5 cm dome | Tweeter: 2,5cm dome | Dimensions: 36 × 83.5 × 34 cm | Weight: 30kg | Original sale price in Germany: 1400 DM per piece | Finish: Rosewood, White |
Designer: Jakob Jensen
CORAL CX-77 (JAPAN 1976)
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CORAL CX-77, Naturally beautiful, High Linear Sound from 1976. Proper balance among tweeter, squawker, and woofer is crucial when assembling a good speaker system. Cone paper, the heart of the woofer, must possess high Young's modulus and be fully flexible. The woofer in the CX-77 speaker system features Coral's own specially developed micro-crystal cone paper, the surface of which is coated with fine hollow crystal grains 0.1mm in diameter and with a specific gravity of 0.3. Thus partial vibration has been greatly enhanced, refining the transient characteristics of the lower and bass ranges. The rest of it, too the free edge with full linearity, diecasting frame absolutely without resonance, powerful magnetic circuit help all contribute to some of the richest, most listenable low frequency sounds available. The tweeter flawlessly reproduce the delicate high-range sound properties of every musical instrument. Coral's is a hard dome-type super-tweeter that uses a diaphragm of 18-micron-thick ultra-thin Super Duralmin having a crossover frequency of 7,000Hz. The expanded high-range frequency response of 40,000Hz easily reproduces everything within the normal audible frequency of 20,000Hz with outstanding directivity. The sound quality is amazing. There is also an attenuator that enables continuous variation of the mid- and high-frequency ranges independently. The x-over network is a Low-loss design employing a Mylar film capacitor and a coil featuring a high permeability reluctance ferrite core, which refuses to cause linear distortion even under large input. The design brings out the maximum transient characteristics of each speaker. CORAL, having developed its own exclusive method for molding highly rigid titanium speaker domes, is now able to provide the audiophile with the most superb mid-range speakers ever. The voice coil in these speakers features CCAW winding and flawlessly maintains optimum balance of mass, extending the high range limit and largely improving transient characteristics. The aluminum bobbin boasts large input resistivity, and a spacious back cavity easily expands the frequency response of the lower range to efficiently cover everything from 700Hz to 7,000Hz. Clear, faithful sound. What more could one ask? The higher the performance of the speakers, the more important the quality of their enclosure becomes. The CX-77 system uses a bass-reflex enclosure, which features a highly condensed multi-layer particle board, eliminating unwanted vibration. The side, baffle and back boards are strongly reinforced. The speakers are symmetrically mounted to achieve optimum directivity. Beautifully finished with UVD coating, the CX-77 system enclosure symbolizes the perfection of the system. Specifications: Enclosure Bass-reflex type | Speakers: 30cm woofer, 5cm titanium dome squawker, 2cm hard dome tweeter | Frequency response: 30-40,000Hz | Crossover frequency 700Hz, 7,000Hz | Output sound pressure level. 94dB | Program source input 80W | Impedance. 8 Ohms | Dimensions 390mm(W) x 650mm(H) x 320mm(D) | Weight 22kg
DENON SC-1200 (JAPAN 1984)
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High quality, high-performance loudspeaker. Not what you'd first think of if, you mention the name Denon. The SC-2000 presented here was made by Denon in 1984 using a loudspeaker manufactured by "Gauss America". Gauss was an American (U.S.A.) speaker manufacturer founded by former retired JBL employee (Bert Loncansey, Ed May). This is however not the first Denon "Studio Monitor" nor the first cooperation between Gauss and a Japanese manufacturer (more about this later). Anyway, the model presented here is using a Gauss 3588 coaxial 2-way unit. The woofer section is using a specially treated paper cone with multi-corrugations and a diameter of 38cm. The high frequency unit is a horn-shaped unit with a unique curved horn designed by computer design...with a a 50mm diaphragm. This coaxial unit provided excellent localization , and it also had the characteristics of a monitor speaker. Technical Data: 2-Way Bass Reflex | Max. Input: 200 W | Frequency Range: 30Hz-20.000Hz | Impedance: 8ohm | Woofer: 38cm Pure coaxial type | Dimensions: 590x960x454mm (WxHxD) | Weight: 66kg
DUAL CL-730 (GERMANY 1979)
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The CL-730 was the top model of the 700 Series from Dual and it was introduced in 1979. The most prominent feature of the CL-730 (and its' smaller siblings) is the so called "Thermo Float" technology. This is an aluminum die-cast cooling system with concentric cooling fins mounted in the center of the woofer which is considered to be necessary for the increased dynamic range of the future Digital technology. For a "crisp and clear" sound the CL-730 features dome midrange and dome tweeter drivers. Technical Data: 3-Way Closed | Music Power: 150 W | Nominal Power: 120 W | Frequency Range: 20Hz-25.000Hz | Impedance: 4/8 ohm | Woofer: 24,5cm - Midrange: 5cm Dome - Tweeter: 2,5cm Dome | Dimensions: 330x590x250mm (WxHxD) | Weight: 17kg | Available in Black and Oak | Optional Speaker Stand LF 2 | Original sale price: 650 DM
GRUNDIG MONOLITH 8500 (GERMANY 1988)
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The Monolith 8500 from Grundig was introduced in 1988 however the same model was available since 1986 and it was initially simply called Fine Arts. The shown model is the luxurious real wood veneer version but there was also a black version with the same specifications. Technical Data: 3-Way Closed | Max. Input: 150 W | Nominal Power: 100 W | Frequency Range: 25Hz-25.000Hz | Impedance: 4ohm | Woofer: 24,5cm Cone - Midrange: 3,7cm Dome - Tweeter: 2,5cm Dome | Dimensions: 330x530x310mm (WxHxD) | Weight: 15kg | Available in Black or Walnut
JAMO CBR 200 (DENMARK 1986)
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The CBR 200 introduced by Jamo of Denmark in 1986 was part of their so called Digital Monitor Series. This series has an unusual asymmetric construction with NCC (Non Coloration Compound) front panel and a very unique bass reflex syste, the CBR (Center Bass Reflex). With this system the reflex port surrounds the whole contour of the bass speaker instead of a more conventional reflex tube. Specifications: System: 3-way CBR | Bass unit: 25cm dual magnet - Midrange unit: 13cm - Treble unit: 25mm dome | Rated power: 200W | Frequency range: 28-24.000Hz | Impedance: 4-8 ohm | Dimensions: 82x40x35cm | Weight: 25kg
ONKYO D-5 (JAPAN 1981)
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Just as musical styles evolve, so do the trends in sound reproduction. Onkyo’s approach to speaker design has always focused on natural expressiveness—creating sound that stays true to the original recording without coloration or distortion. A speaker’s true character depends on the quality of its diaphragm, and Onkyo has achieved remarkable purity with its innovative Delta Olefin diaphragm. Unlike conventional materials, Delta Olefin offers minimal resonance and fast decay characteristics, delivering smooth, accurate sound reproduction across all frequencies. In technical terms, it provides a low Q factor and quick transient response—but from a musical perspective, it means the speaker “breathes” naturally, resonating only with the music itself. The result is a clear, detailed, and emotionally engaging sound that faithfully reflects every nuance of the performance. This advanced three-way speaker system showcases Onkyo’s commitment to high-fidelity engineering:
Low frequencies: 28 cm cone-type woofer with a Delta Olefin diaphragm and dust cap. Equipped with a four-layer voice coil and Capton bobbin for improved power handling and precise bass control. Midrange: 10 cm cone driver, also crafted from Delta Olefin, housed in a dedicated 1-liter sealed enclosure to eliminate interference and ensure pure midrange reproduction. High frequencies: 2.5 cm soft-dome tweeter made from specially developed chemical fibers with uniform thickness, achieving up to 2–3 dB higher efficiency than conventional designs. Fine-tuning: Independent level controls for both midrange and high frequencies allow personalized sound adjustment. The result is the distinctive “Delta Olefin Sound”—a long-awaited breakthrough that meets the demands of discerning music enthusiasts. With exceptional clarity, natural tonality, and sensitivity to every genre, this Onkyo loudspeaker stands at the forefront of modern high-fidelity audio. Maximum power: 120W | Frequency range: 33-30.000Hz | Impedance 6ohm | Size: 350x630x325mm (W/H/D) | Weight: 16,5kg
Low frequencies: 28 cm cone-type woofer with a Delta Olefin diaphragm and dust cap. Equipped with a four-layer voice coil and Capton bobbin for improved power handling and precise bass control. Midrange: 10 cm cone driver, also crafted from Delta Olefin, housed in a dedicated 1-liter sealed enclosure to eliminate interference and ensure pure midrange reproduction. High frequencies: 2.5 cm soft-dome tweeter made from specially developed chemical fibers with uniform thickness, achieving up to 2–3 dB higher efficiency than conventional designs. Fine-tuning: Independent level controls for both midrange and high frequencies allow personalized sound adjustment. The result is the distinctive “Delta Olefin Sound”—a long-awaited breakthrough that meets the demands of discerning music enthusiasts. With exceptional clarity, natural tonality, and sensitivity to every genre, this Onkyo loudspeaker stands at the forefront of modern high-fidelity audio. Maximum power: 120W | Frequency range: 33-30.000Hz | Impedance 6ohm | Size: 350x630x325mm (W/H/D) | Weight: 16,5kg
ONKYO D-77XX (JAPAN 1987)
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The D-77XX is constructed with extremely low-coloration components, including high-quality speaker units designed for high rigidity and zero resonance, a high-strength cabinet, and a high-quality network. Furthermore, vibration analysis technology thoroughly eliminates unnecessary vibrations, ensuring a highly responsive system that responds sensitively to the characteristics of the other components it is combined with. Therefore, when creating a system, careful consideration should be given to the selection of other equipment. Using high-quality cables and pin cords will allow you to more clearly hear the differences between the components. The amplifier and CD player are particularly important. Using an amplifier with a robust power supply and clean amplification circuitry, along with a CD player with natural, transparent sound quality, will allow you to directly demonstrate the D-77XX's dense sound field creation capabilities. The D-77XX does not include a level control attenuator in order to thoroughly simplify the network. The tradeoff for achieving high-purity sound quality is the need to adjust the low-frequency settings to achieve a balanced sound. Generally speaking, bass tends to increase the closer the speaker system is placed to the floor, left and right walls, and rear wall. Fine-tuning while checking the reproduction of bass instruments from sources familiar to the ear will produce good results. The D-77XX also features a bass reflex duct on the rear of the system, which may not function properly if placed too close to the wall. Setting it more than 5cm away presents almost no problems. Regarding mid- and high-frequency reproduction, sound waves can be reflected by hard surfaces like window glass, creating a harsh sound. In such cases, using the sound-absorbing properties of curtains or other devices to suppress the primary reflection of sound waves is an effective technique. Technical Data: 3-Way Bass Reflex | Max. Input: 230 W(EIAJ)
Nominal Power: 75 W(EIAJ) | Frequency Range: 28Hz-45.000Hz | Impedance: 6ohm | Woofer: 31cm Pure Cross-Carbon Cone - Midrange: 12cm Pure Cross-Carbon Cone - Tweeter: 2,5cm Plasma-Carbonite-Titanium Dome | Dimensions: 380x670x363mm (WxHxD) | Weight: 34kg | Available in Black or Walnut | Speaker Stand AS-77DX Dimensions: 390x220x355mm (WxHxD) Weight: 7.5kg | Original sale price: 2800 DM/pair in Germany
Nominal Power: 75 W(EIAJ) | Frequency Range: 28Hz-45.000Hz | Impedance: 6ohm | Woofer: 31cm Pure Cross-Carbon Cone - Midrange: 12cm Pure Cross-Carbon Cone - Tweeter: 2,5cm Plasma-Carbonite-Titanium Dome | Dimensions: 380x670x363mm (WxHxD) | Weight: 34kg | Available in Black or Walnut | Speaker Stand AS-77DX Dimensions: 390x220x355mm (WxHxD) Weight: 7.5kg | Original sale price: 2800 DM/pair in Germany
PIONEER CS-3000A (JAPAN 1973)
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The original CS-3000 was introduced by Pioneer in 1971. It was highly praised for its excellent mid and high-range reproduction, but bass reproduction was said to be a weak point of the CS-3000. To solve this problem Pioneer introduced the CS-3000A with an inprowed woofer. The newly developed woofer had the same 30cm diameter, but the magnet was equipped with a large 200mm diameter ferrite magnet. The center pole was covered with a pure copper cap, just like the CS-3000, to suppress distortion caused by the nonlinearity of magnetic materials. The frame had a sturdy structure made of die-cast aluminum, eliminating resonance. This cone paper was newly developed for the CS-3000A, and the center cap was made of the same material as the cone paper, with wavy bumps to increase its strength. The cone edge was made of foamed urethane, just like the CS-3000. The cone neck inside the center cap had a new mechanism that used a special open-cell foam. It suppressed nonlinear distortion caused by air circulation inside the cap, and also acted as a mechanical filter to prevent abnormal sounds caused by concentrated compliance in the neck. The damper had a symmetrically arranged double damper structure, which improved the linearity and reliability of the suspension. The voice coil was edgewise wound with aluminum ribbon wire, just like the CS-3000, and the aluminum foil ribbon, heat-curing epoxy resin, and short winding effect improved the heat dissipation effect and improved input resistance. As described above, the CS-3000A is a model that strengthens the bass section of the CS-3000, and is a powerful unit that realizes stronger bass reproduction capabilities to match the excellent mid- and high-range sounds. The midrange was equipped with a 6.5 cm diameter dome-shaped unit. The 6.5 cm diameter dome-shaped diaphragm made of duralumin kept the amplitude small, reduced IM distortion, and ensured low-frequency reproduction capability up to 700 Hz. The tweeter was a 2.0cm diameter dome type. It was a combination of a duralumin dome with a diameter of 20mm and a thickness of 30μ, a double-layered urethane foam edge, and an edgewise wound voice coil with aluminum ribbon wire. The network was equipped with a 700 Hz and 6000 Hz crossover with an attenuation of 12 dB/oct. The feature of this network is that the impedance rise at the fo of the midrange and tweeter was corrected by a compensation circuit, and the impedance of each speaker was made flat, which resulted in a straightforward cutoff characteristic and improved phase characteristics. The level control was performed by simultaneous switching of the coil step-down and compensation resistor, and the midrange could be switched in four steps of 2 dB, and the high range could be switched in five steps of 2 dB. The enclosure was a completely sealed type (air suspension type) and used a combination of 25 mm thick hard particle board and lauan plywood. Instead of the conventional rod-shaped reinforcement, the internal reinforcement was a flat plate with four small holes, which reinforced the front, back, left and right sides while preventing standing waves. In addition, 800g of glass wool was built in, providing effective internal treatment. The enclosure baffle surface was flat, and the grill net was also designed to prevent deterioration of the playback characteristics. The surface was finished with Brazilian rosewood, giving it a high-class feel. The CS-3000A could be single, bi or tri amplified. Specifications: 3-way Infinite Baffle | Drive units - 30cm Bass - 6,5 Dome midrange - 2,5 Dome tweeter | Frequency range: 30-20.000Hz | Power rating 100W | Impedance 8ohm | Size (WxHxD): 360x630x327mm | Weight: 33kg
ReVox BX350 (SWISS 1978)
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Linear phase system. The unique shape of the new REVOX loudspeaker plays an important functional role. The staggered loudspeaker arrangement compensates for the different response times of the various drivers and restores the original phase position within listening distance. This will give excellent impulse reproduction and therefore clean transient response and increased transparency in the width and depth of the sound image. To improve bass reproduction, ReVox came up with something unconventional: four small bass drivers instead of one large one. For bass and mid-range there are four long-throw woofers, each of which has a diameter of just 122 mm. The advantage of this solution: lower distortions, because the individual membranes only have to make comparatively small deflections. Because of the low moving mass of the individual chassis, even medium frequencies can be radiated cleanly. With this concept, Revox was able to do without a separate midrange driver and design the BX350 as a two-way speaker. The four low-midrange drivers cover the entire frequency range up to 3200 Hertz. This is where the dome tweeter comes in. Revox engineers therefore installed the four woofers on a slightly concave baffle: Each of the four systems radiates in a different direction, which is intended to significantly improve the omnidirectional radiation behavior in the mid range. In order to avoid phase shifts, the four cone speakers and the tweeter are mounted so that the front edges of all voice coils are in one plane.
Technical Data: 2-Way Closed | Music power: 100 W | Nominal power: 80 W | Frequency Range: 30Hz-20.000Hz | Impedance: 4ohm | Bass-mid: 4x122 mm Rubber surround, die-cast chassis - Tweeter: 25 mm dome | Dimensions: 350x520x295mm (WxHxD) | Weight: 14kg
Technical Data: 2-Way Closed | Music power: 100 W | Nominal power: 80 W | Frequency Range: 30Hz-20.000Hz | Impedance: 4ohm | Bass-mid: 4x122 mm Rubber surround, die-cast chassis - Tweeter: 25 mm dome | Dimensions: 350x520x295mm (WxHxD) | Weight: 14kg
SANSUI SP-20000 (JAPAN 1973)
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Sansui has three good things (and one bad thing) to tell you about the SP-20000 three-way, floor standing speaker system introduced in 1973. First, the bad thing: if you play bad music through it, you hear bad music from it. What could be more fair? The SP-20000 is a full-bodied speaker system entirely without a "personality" of its own. That's good. The sound waves it puts out are exact conversions of the electrical impulses it receives from your amplifier or receiver. Thus, good or bad, the material you feed it is reproduced accurately and objectively as the medium of high fidelity can achieve. When you hear the results, you'll definitely agree that this is good thing number one. Good thing number two is the fact that two of its three active speaker drivers employ a revolutionary Sansui development called the Direct-Drive Ring Diaphragm - or DDRD for short - to improve phase response, transient response and frequency response. The tweeter and midrange units in the SP-20000 are the first commercially available speakers to use this unique system where the voice coil is the diaphragm, and vice versa. Good thing number three is that the total design of the SP-20000 is integrated right down to the most minute detail. A precision-engineered "passive radiator" woofer is included to smooth and enrich the lows. The crossover and level control system are accurate and extremely flexible. The long-excursion, free-surround woofer is capable of very flat (linear) response at all input levels with reduced intermodulation distortion. And to wrap it up, the SP-20000's sensitivity (93dB/m/W, which is high but not too high) means that inputs from the exceptionally big peak of 100 watts clear down to low-power signals are handled efficiently at any listening level. The clean and linear musical reproduction of the SP-20000 goes for any kind of music, from bubblegum to Bartok and from jug bands to symphonies. Sansui markets the SP-20000 by the pair, the right-channel unit is a mirror-image of the left-channel unit in terms of speaker placement. Each matched pair of SP-20000 comes with a pair of two-way speaker stands of attractive and strong aluminum tubing. Speakers may be positioned flat or on a slight angle. Technical data: Woofer - 255 mm cone, Passive radiator - 255 mm cone, Midrange - 90 mm horn, Tweeter - 40 mm horn | Power rating 100 W (Max.) | Impedance 8 ohms | Sensitivity 93 dB/W | Frequency range 25 to 40,000 Hz | Crossover 1.500Hz, 7.000Hz 12dB/oct. L-C parallel type | Dimensions without stand 376 W x 786 H x 320 D mm | Weight 30 kg.
Sansui XL-900C (JAPAN 1983)
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With the advent of Compact Discs and other digital programs, conventional speaker diaphragms were found to be not up to the task. Response was not fast enough, and they couldn't handle the powerful transients and extra wide dynamic range. What was needed was a diaphragm material that was light yet rigid, anti-resonant, and able to absorb vibrations - properties that were thought to be mutually exclusive. Sansuis' research efforts led to the develop-ment of two radically new diaphragm designs that provide nearly ideal proper-ties. They are TCCF (Tri-Composite Carbon Fiber) and PM-C (Polypropylene, Mica and Carbon). Enter the XL-900C TCCF 3-Way Speaker System. Thanks to the light yet rigid TCCF (Tri-Composite Carbon Fiber) woofer diaphragm, this speaker system is ideal for new digital program material. Transients and presence are both superb, making listening an exciting new sonic experience. Bass thunders when it is asked to, and treble is sparklingly clean. It is equipped with a 320mm TCCF cone woofer, Low-mass 60mm ceramic hard dome midrange and a 25mm Super Titanium hard dome tweeter for flat response, wide frequency range and wide dispersion. Rounded cornered front baffle for low diffraction and better sound definition. Low-loss, low-coloration network. Maximum input, 180 watts. Specifications: 3-way bass reflex type | Woofer: 32cm TCCF diaphragm cone type - Midrange: 6cm HS ceramic hard dome type - Tweeter: 2.5cm super titanium hard dome type | Frequency Response: 30-35,000Hz | Impedance: 6 ohms | Maximum Input: 150W | Output Sound Pressure Level: 93dB/W/m | External dimensions: 390W x 690H x 330D | weight: 26,5kg
SANYO SX-Z3000 (JAPAN 1990)
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The main feature of the SX-Z3000 from Sanyo is the Twin-Drive woofer system. This is a completely new type of speaker using a completely new method that uses two drive units installed in front and behind of the the flat diaphragm to drive-it in a push-pull manner. When one drive unit pushes out the diaphragm, the other one pulls it in, and vice versa. This new woofer design uses drive energy more efficiently equalizes uneven magnetic flux density, equalizes the damper's diaphragm control force, and eliminates rolling phenomena, resulting in significantly improved linearity. This method makes possible to achieve lower distortion and less heat generated. For maximum rigidity all the elements are mounted in a aluminum die-cast frame. The cabinet is made of high-density particle board with rounded edges for less diffraction. As a result of Fisher being owned by Sanyo another version was sold as Fisher STE-555. Technical Data: 3-Way Bass Reflex | Music Power: 300 W | Nominal Power: 100 W | Frequency Range: 25Hz-40.000Hz | Impedance: 8 ohm | Woofer: 32 cm Flat-Honeycomb Twin-Drive - Midrange: 13cm Hybrid Dome-Cone - Tweeter: 2,5cm Titanium Dome | Dimensions: 421x778x520mm (WxHxD) | Weight: 51kg | Optional Speaker Stand APS-Z3000 | Original sale price: 4500 DM (Germany)
SONY SS-G7 (JAPAN 1976)
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An ambitious offering developed by Sony’s audio business group, which had just been formed. The speakers effectively updated the Sony image in this category, with features such as carbon cones, an inline speaker layout (arranged on the same vertical and horizontal axes), and a grooved baffle to prevent standing waves for better acoustics. Audiophiles will also notice other details in the original style, such as the way the woofer edge protrudes from the baffle. The 38cm woofer with a voice coil of 100mm diameter and with low-distortion magnetic circuit reproduces deep and rich bass sound. The 3.5cm tweeter and 10cm mid-range of balanced-drive type has an excellent performance and high linearity that will reproduce a well-balanced sound in high and mid frequencies. The baffle board is grooved in lattice pattern to improve the acoustical effects and directivity. In accordance with your personal preference and the room acoustics, the tweeter and mid-range levels can be adjusted by front panel controls. Specifications: Three-way bass-reflex, 38cm Carbocon woofer, 10cm balanced mid-range, 3.5cm balanced dome | Impedance 8 ohm | Power: 100W Nominal, 200W Maximum | Sensitivity 94 dB (1W, 1m) | Frequency range 27 Hz to 25,000 Hz (+4/-8 dB DIN) | Dimensions 510x940x445 mm | Weight 48 kg.
TECHNICS SB-7000 (JAPAN 1975)
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This Classic model was released in Japan in 1975 and it was simply called Technics7. Later, when it was added to their export programme it was renamed SB-7000. In order to obtain linear phase response, the travel time of the sound from the speaker to the listener must be the same for each driver. The Technics SB-7000 therefore is built with its drivers staggered in such a way that their acoustic centers are equidistant from the listener's position. Technics developed three drivers of very, very wide frequency range to be used in the SB-7000, so that only the linear phase portion of each driver's range could be combined in a 3-way system of exceptionally linear overall phase response. The woofer is an extra-large 35cm triple-layer TC cone with blended aramid fibers to reduce doppler effect distortion. The 12cm midrange driver uses the same TC/aramid fiber-blended cone structure. The 32mm dome tweeter is a special high efficiency, low distortion dome driver, using a rectangular-shaped magnet, and a special dome-shaped diaphragm of heat-molded expanded polyurethane on a silk cloth base. The midrange unit operates in a sealed and damped enclosure while the woofer is loaded by two resistively-coupled cavities occupying the volume of the main cabinet leading out to a slot port below. The crossover unit is mounted at the rear of the midrange unit. The standard SB-7000 came with black grilles and black laminate surfaces with simulated wood for the side. Two more versions existed, the SB-7000MP with real wood veneer on the sides and the SB-7000W all white with green grilles. All versions are equipped with heavy duty carrying handles and protection bars around the woofer grille. Technical Specifications: 3-way 3-speaker bass reflex | Impedance 6 ohm | Instantaneous maximum input power 150W | Crossover frequencies 700Hz, 6kHz | Frequency range 37Hz-22kHz (-10dB) | SPL 90.5 dB/W (1m) | Dimensions 480x845x410 | Weight 33kg.
TELEFUNKEN TLX 3 PROFESSIONAL
(GERMANY 1978)
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Introduced in 1978 the TLX Professional series from Telefunken featured a series of high-tech solutions. The largest model of this series was the TLX 3 Professional which was later replaced by the slightly upgraded TLX 33 model. While the enclosure of the TLX 3 is a traditional particle board with either "metallic-brown" or matte black finish, the front baffle was made of a new type of composite material - a blend of wood particles reinforced with glass-fiber for lower resonance. Built as a 4-way sealed speaker the TLX 3 features a 245 mm long-throw woofer, 65 mm mid-bass dome, 33 mm mid-high dome and a 25 mm dome tweeter. All the dome drivers feature a ferrofluid cooling system borrowed from space technology that helped increasing power handling and damping. The 25 mm dome tweeter is a 3-layer sandwiched material with aluminium as the middle layer. Additionally, the tweeter and midrange can be adjusted to adapt reproduction to ambient conditions and to the frequency characteristics of the amplifier and sound sources, the LED bass and treble overload indicator helps you to safely operate the loudspeaker while the tweeter has an additional "Sensistor" protection. Technical data: 200 W Music 120W Nominal power handling | Impedance 8 ohm | Frequency range 22-25000 Hz | Cross-over frequencies 500/2700/5000 Hz | Dimensions: 35,5x54x27 cm | Weight: 19kg | Original sales price: 750 DM.
TRIO-KENWOOD LS-1000 (JAPAN 1981)
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The LS-1000 (LS-1800 on some markets) was the largest model in the Linear Response Speaker System lineup introduced by Trio-Kenwood in 1981. The LS-1000 has a high-rigidity enclosure with angled and reinforced back panel (no sound absorbing material inside), mirror imaged construction and separate enclosure for the midrange and tweeter. The 28cm woofer has a high-rigidity ribbed cone paper, die-cast frame and it uses a special mounting method. Instead of the usual screw mounting they are installed utilizing a bayonet mounting similar to the one used for photo camera lens. The 10cm acrylic resin flat diaphragm mid-range and the 3.6cm carbon fibre tweeter are mounted on a die-cast front panel while the cross-over frequencies are at 800Hz and 6kHz. If you look closer at the speaker terminal of the LS-1000 you will notice an extra set of terminals labelled "Sigma Drive". This enables the loudspeakers to be used with Kenwood's "Sigma Drive" amplifiers. Kenwood's exclusive patented "Sigma Drive" ignores traditional amplifier-speaker relationships by extending the amplifier's negative feedback loop past the output terminals, all the way to the speaker terminals. "Sigma Drive" ties a speaker's behavior directly to the amplifier's performance, which produces an unprecedented damping in excess of 600 at the speaker terminals and literally forces a speaker to behave in perfect sync with the amplifier. Technical data: 3-way, 3-speaker, linear suspension system | Power: 180W Max, 120W Rated | Frequency response: 32Hz-25kHz | Impedance: 8ohm | Dimensions: WxHxD 360x680x326mm | Weight: 33.5 kg.
Victor SX-55 (JAPAN 1977)
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Based on the success of the SX-3 (from 1972) Victor introduced the "double number series" SX-55 in 1977. This is a closed type 3-way speaker system featuring a 30cm KDU-cone woofer manufactured by Kurt Muller in Germany, a 6.5cm soft dome midrange and a 3 cm soft dome tweeter. There are two types: Scandinavian oak finish (SX-55N) and rosewood finish (SX-55R). Technical Data: 3-Way sealed (closed) type | Max. Input: 80 W | Frequency Range: 25Hz-20.000Hz | Impedance: 4ohm | Crossover frequency: 700Hz, 5.500Hz | Woofer: 30cm KDU-cone - Midrange: 6.5cm soft dome - Tweeter: 3cm soft dome | Dimensions: 640x360x325mm (WxHxD) | Weight: 19kg
YAMAHA NS-1200 classics (JAPAN 1987)
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Released by Yamaha in 1987 the NS-1200classics features a 30cm diameter cone type woofer, a pulp cone rather than the new materials such as cross carbon that were mainstream at the time . In keeping with Yamaha's style, spruce wood was used as the raw material. Spruce is often used for piano soundboards, and is said to have a beautiful sound. Yamaha chose spruce from among the various trees in the world, and after much effort, completed an original 100% spruce pulp cone for the company's famous NS-690III in 1980. The woofer of the NS-1200classics inherited that technology. The magnetic circuit that drives the woofer uses an alnico magnet. The squawker was equipped with an 8 cm soft dome type unit. This soft dome unit was made of cotton as the base material, impregnated with phenolic resin, and thermoformed, achieving beautiful mid-range reproduction with excellent reproduction of acoustic instruments. |
The squawker's magnetic circuit used an internal magnet type with an alnico magnet, just like the woofer. The tweeter was equipped with a 3cm soft dome type unit. It was made of the same material as the squawker. In addition, the magnetic circuit was also an internal magnet type with an alnico magnet, like the woofer and squawker. The cabinet was a sealed type, heavy and sturdy, with a total weight reaching 42kg. All five sides except the back were finished with natural American walnut boards, with a mirror finish with urethane gloss paint, giving it a beautiful and calm appearance design. In addition, a dedicated speaker stand SPS-1200 was available separately. Technical data: Format: 3-way closed type |
Speakers: 30cm cone woofer - 8cm soft dome squawker - 3cm soft dome tweeter | Crossover Frequency: 400Hz (12dB/oct) 4kHz (12dB/oct) | Frequency response: 40Hz to 30kHz | Impedance: 6 ohms | Input Power: 75W | Music Input Capacity: 150W | Output Sound Pressure Level: 88dB/W/m | External dimensions: 375W x 740H x 380D mm | Weight: 42kg
Speakers: 30cm cone woofer - 8cm soft dome squawker - 3cm soft dome tweeter | Crossover Frequency: 400Hz (12dB/oct) 4kHz (12dB/oct) | Frequency response: 40Hz to 30kHz | Impedance: 6 ohms | Input Power: 75W | Music Input Capacity: 150W | Output Sound Pressure Level: 88dB/W/m | External dimensions: 375W x 740H x 380D mm | Weight: 42kg
