Yamaha DSP-A700 (1990)
Seven channels of amplification, Dolby Pro Logic, and a chip full of sampled concert halls - the component that tried to put a jazz club in your living room.
Overview
The pitch fit on a magazine page. A listener presses a button on the Yamaha DSP-A700 and his one-bedroom apartment becomes an opera house, a stadium, a jazz club, a cathedral. Yamaha's own advertising for the DSP-A700 leaned hard on that idea. Engineers were supposedly sent around the world to sample "dozens" of entertainment environments, digitally recorded onto a computer disk and packed onto a single chip. Marketing copy is not a verdict, but it shows what Yamaha thought it had built. This was not another surround decoder. It was a Digital Soundfield Processor with seven channels of amplification, Dolby Surround, Dolby Pro Logic, and YST (Active Servo Technology) all in one chassis.
The price was $1,099, and the press took notice. HiFi-Stereo (April 1990, p.60) described the DSP-A700 as "a complete seven-channel amplifier and surround-sound processor," which is the cleanest one-line summary anyone managed. The "up to seven" phrasing matters because Yamaha sold the DSP-A700 as a system hub, not a stereo amp with a decoder bolted on.
The front panel promised the soundfield concept, and the spec sheet could not capture it. Yamaha's Cinema DSP was the combination of Digital Sound Field Processing and Dolby Pro Logic. The company spent the next several years promoting it as a milestone, and the DSP-A700 sits at the front of that story. HiFi-Stereo (April 1996, p.27), looking back six years later, framed it plainly: "1990, the 7-channel DSP-A700 is..." The sentence trails off in the OCR, but the placement is clear. This was the component Yamaha pointed to when it wanted to explain where Cinema DSP came from.
The practical appeal was flexibility. Audio's 1990 survey of the home-theater market noted that manufacturers were "refining components for high-quality home theater systems," and cited the DSP-A700 as a good example. It was a box that could take Dolby-encoded videotapes and laser discs and spread them across a multi-speaker array. The same survey noted that the DSP-A700 could be paired with Yamaha's YST-SE10 deep-bass effects channel speaker, so the intended installation was not a two-channel affair. Owners were expected to run surrounds, a center, and a subwoofer off this thing.
The catch, as with any first-generation surround flagship, is that the technology dates fast. Dolby Pro Logic was superseded by discrete digital formats within a few years, and the seven channels of amplification were designed around the speaker layouts and source material of 1990. Collectors today treat it as a period piece, an early and ambitious statement of the Cinema DSP idea rather than a daily-driver home-theater receiver. Yamaha kept invoking the DSP-A700 in its own advertising years later, which says something about how central the model was to the brand's self-image. It says less about whether the unit still makes sense in a modern system.
Condition and completeness are the usual concerns with a component this old and this complex. The DSP-A700 is a multi-channel amplifier with digital processing inside, so there is more to go wrong than in a plain stereo integrated. The fact sheet for this page is thin on service history, failure modes, and current market values, so treat any specific reliability claim with suspicion until it can be checked against a unit in hand. What is documented is the original price ($1,099), the feature set (seven channels, Dolby Surround, Dolby Pro Logic, YST, Digital Sound Field Processing), and the companion AVS-700 selector at $299.
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