Elite SP-91D Surround Sound Processor

The SP-91D Digital Sound Processor was introduced by Pioneer in 1989. It was, in the words of Stereo Review magazine, "...a digital sound processor designed to simulate a variety of acoustic characteristics, or sound fields, in a listening room to enhance the sound of stereo reproduction."

The features of the SP-91D included:

• Sixteen factory present sound-field programs sixteen memory presets of user-selected programs.
• Dolby Pro Logic decoding with eight program modes.
• Adjustable for initial delay, room size, liveness, reverb time, HF reverb, front and rear EQ.
• Four-channel and six-channel modes
• Seven-band digital graphic equalizer; independent settings for front and rear processed signals.
• Motor-driven volume control
• Display of complete system operating status
• Infrared remote control for all adjustments. 

Stereo Review tested the SP-91D in the December 1989 issue, and that test is reproduced below. What impressed the editors the most was the subtle effect the unit had on listening to music and the profound effect it had on the sound quality without it. M.S.R.P. was $1000.00.

SP-91D Test Report (Dec. 1989 Stereo Review):

Click on the thumbnail image to enlarge.

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