Blaupunkt PSA-168
The Blaupunkt PSA-168 is a car audio power amplifier from the late 1980s. Nearly everything known about it comes from a handful of period magazine reviews. Surviving documentation is thin.
Audio (May 1989, p.43) called the PSA-168 a "Sound Amplifier" and described its look as clean and utilitarian. The top panel carries the Blaupunkt name, trademark, and model number. It comes off to show a recessed area with multi-position adjustment controls. Hooked up as received, the amplifier's frequency response was flat throughout and beyond the audio spectrum, down only 0.15 dB at 20 Hz and 20 kHz. Bench testing showed 40 watts per channel. At that output, total harmonic distortion plus noise (THD+N) measured 0.085% at mid-frequencies and 0.12% at 20 kHz. Low frequencies were less clean. THD+N rose to 0.85% at 20 Hz and peaked at 1.8% around 120 Hz. Dropping the output to 35 watts per channel brought low-frequency THD down to just over 0.1% (Audio, May 1989, p.47).
The PSA-168 belonged to a small family of Blaupunkt power amplifiers that included the PSA-108. High Fidelity (November 1988, p.19) noted that a system built around the PSA-108 had been reviewed earlier that year in a Buick LeSabre, placing the PSA-168 within the same late‑1980s product generation. Beyond the measurements and a brief design note, no production years, original pricing, or further specifications have turned up in the available record.
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