Technics SB-1000
220,000 Yen per piece（1974）
Currently, the cost of AC according to the CPI index will be equal to 875,000 Yen = 8,750 $
In 1974, this speaker, as they say now, was completely innovative.
It used new GGs, new materials, new approaches to their processing, a new approach to reducing vibrations and the signal-to-noise ratio in the low-frequency range.
The basis was a 30 cm conical woofer EAS-30L100S. The diffuser is made of a mixture of paper and material with a high Young's modulus; under high pressure, 3 layers of material are compressed into one. As a result, the frequency response was achieved with virtually no distortion. Also, the symmetrical double suspension structure neutralizes second-order distortion. To reduce the running resistance of the diffuser, there is a large hole in the magnet, which also removes heat well.
In the midrange, the EAS-18KM100S GG with a 4.5 cm dome, also made of three-layer material, operates. To reduce losses, a core made of a sheet of special electrical steel with high magnetic induction is used. A voice coil with an increased stroke of +/- 7 mm is also used. The system has no magnetic flux loss and has unique linearity.
HF GG EAS-12KH100S with a 1.9 mm dome is made of ultra-thin titanium alloy with a thickness of 20 mK. It is 30% lighter than similar aluminum and has better transient characteristics. The magnet is made of Fe-CO alloy with high resistivity and an incredible magnetic flux density of 19000 Gauss. The reduction of distortion is also facilitated by a silicon alloy choke with a steel E-shaped base, which gives ultra-low, less than 0.1% per 100W output power.
The housings of all GGs are mounted on a die-cast aluminum frame and have multi-point internal fastening.
The 36mm body is made of three layers of extra-thick plywood, three layers of inner 9mm, middle 18mm, outer extra-hard plywood 9mm. The body is absolutely free of resonances.
The connection can be made through the built-in crossover or each GG separately.
The outside of the housing is covered with a vibration-damping, black, matte paint coating that is resistant to external influences.
As you will see in the measurement graphs, the work of Matsushita’s brilliant engineers was not in vain. The measured and presented characteristics of the speakers are unique. No speaker in the world can boast of the same. All this has a direct bearing on music playback. There is no point in saying anything about this sound. You need to listen to him!
| Form | 3-way closed type speaker |
| GG | LF：30cm cone（EAS-30PL100S） MF：4.5cm dome（EAS-18KM100S） HF：1.9cm dome （EAS-12KH100S） |
| Frequency | 20Hz～30000Hz |
| Impedance | 8Ω |
| Sensitivity | 90dB/W/m |
| Max output power | 100W |
| Crossover frequency | 500Hz、5000Hz |
| Adjustment | MF：+2～0～-6dB HF：+2～0～-6dB |
| Dimensions | W 392 × H 582 × D397mm |
| Weight | 52kg |
Measurements made by R. Sanchez
Dependence of the amplitude and phase of the impedance on frequency (green - amplitude, yellow - phase; on the left along the ordinate - Ohms, on the right - degrees)
Amplitude-frequency anechoic characteristic on the main axis (smoothing - 1/10 octave) (yellow; green - for comparison, frequency response taken in the NEAR field)
Lateral amplitude-frequency anechoic response (smoothing - 1/3 octave) (green; yellow - axial frequency response for comparison)
Frequency response
Impulse response
Step response
Acoustic phase
expanded
rolled up
Total nonlinear distortion (green - HF, yellow - MF, red - LF)
Amplitude-frequency response on the main axis (smoothing - 1/10 octave) (green - total, yellow - LF GG contribution)
Group detention time
The result of the interaction of acoustics with the room of Raul Sanchez
No measurements taken
Pulse energy versus time (Blackman-Harris weighted)
