ALTEC LANSING 729A
Price unknown (released in 1970)
¥ 622,000 (around 1977)
Commentary
Acousta-Voicette's active equalizer was developed to improve the acoustic characteristics of listening rooms.
The Acousta-Voicette uses a special filter with sharp shoulders to achieve a bandwidth as narrow as 1/3 octave compared to conventional graphic equalizers. The audio frequency band can be divided and adjusted finely according to the sound field characteristics of the room and the characteristics of equipment.
The 729A has 24-element blocks stacked in 2 ch for stereo.
Model Rating
| Type | Active equalizer |
| Format | 2-Channel, 1/3 Octave Band, 24-Element Active Filter Used |
| Frequency characteristic | 20 Hz to 20 kHz ± 1 dB |
| Number of filters | 2 channels, 48 pcs |
| Maximum Insertion Loss | -14dB at center frequency |
| Maximum reinsertion gain | 17dB |
| Input level | Maximum 4.5 Vrms (minimum gain control) |
| Output level | 4.5 Vrms (at 10k Ω load) |
| Input impedance | 100k Ω |
| Noise level | 80 dB (Maximum rated output or less) |
| Channel separation | 60 dB or more |