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Spectro Acoustics P-101

Stereo Pre Amplifier / Equalizer

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Spectro Acoustics P-101


The Spectra Acoustics P-101 has been designed and constructed to offer the true audiophile uncompromised performance and versatility at the lowest possible price. Its performance, both on the test bench and in the sound room, is comparable, if not superior, to any product available today at any cost.

The P-101 is the only totally monolithic preamplifier/equalizer available. The audio signal is internally processed by three dual channel integrated circuits, which have been specially designed for this application to insure the lowest possible noise and distortion.

These integrated circuits contain a total of 165 transistors and 15 diodes. To complement the operation of this integrated circuit signal path, nine specially selected silicon devices are employed, including two fets, six diodes and one light emitting diode.

Although we recommend using the P-101 in conjunction with a Spectro Acoustics power amplifier for optimum performance, we have taken care to insure that the P-101 is compatible with all commercially available power amplifiers, tuners, tape decks, receivers, speakers and magnetic cartridges.

Not only is the P-101 compatible with existing systems, but its studio quality graphic equalizer will allow the user to compensate for deficiencies in room acoustics and various equipment shortcomings. The equalizer circuit is a state of the art version of the standard L-C symmetrical boost and cut arrangement which, besides being totally reliable and repeatable, is properly designed with 6 dB/octave slopes for minimum phase distortion and ringing. A recording studio analysis has shown that the P-101 equalizer has no detectable degradation of sound color due to phase distortion, whereas a similar unit which boasts 12 dB/octave filters produced definite and audible phase distortion.

Dips and peaks in the listening system and acoustic environment can be gently smoothed to a response which is more realistic, or to the listener's taste, therefore, without adding any audible distortion or phase shift.

Standard features include push-button selection of any of four inputs, phone, aux, tuner and tape. Also featured is push-button mode selection for mono - stereo and tape monitor systems. Volume and balance controls are of the linear slide type, as well as the five graphic tone controls. These special control elements provide smooth, silent operation with guaranteed tracking between left and right channels.


Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.05%

Input sensitivity: 5mV (MM), 350mV (line)

Signal to noise ratio: 88dB (MM)

Output: 1V (Pre out), 10V (Pre out Max)

Semiconductors: 3 x IC, 15 x diodes, 2 x FET, 4 x power diodes, 2 x zener diodes, 1 x LED

Dimensions: 15 x 6 x 8.5 inches


instruction/owners manual   English - Pyroil

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This website is not affiliated with or sponsored by Spectro Acoustics. To purchase P-101 spares or accessories, please contact the company via their website or visit an authorised retailer.