The Bose Spatial Control Receiver (Model 551) is a highly sought-after, rare vintage stereo receiver released in 1979. Manufactured by Panasonic for Bose, it is uniquely engineered to pair with Bose 901 speakers by featuring a built-in active equalizer and 100 watts of power per channel.
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Built-in Equalizer: It includes a dedicated equalizer optimized specifically for the Bose 901 (Series I through VI) speaker systems.
Spatial Control: A proprietary feature that allowed listeners to adjust spatial properties (controlling the directionality of the drivers) to alter the perceived size and shape of the performing environment, specifically designed for 901 Series III and IV speakers.
Design: It features a clean wooden case with a motorized or flip-down front panel that hides advanced controls, and an on/off touch sensor located directly on the Bose logo.