Yamaha M1500
A Yamaha mixing console line whose paper trail is almost entirely advertising, and whose identity is tangled in the archives.
Overview
The Yamaha M1500 is one of the more confusing designations in the company's pro-audio catalog. Anyone researching one hits a wall almost immediately. The surviving documentation is thin, and much of what looks like a review is actually a manufacturer advertisement placed in the trade press.
The M1500 was a mixing console series. The period advertising confirms that much. Recording-Engineer (December 1984, p.95) ran a Yamaha advertisement headed "And now a message on Yamaha's M1500 series mixing consoles," and a near-identical placement followed in Recording-Engineer (February 1985, p.101). Those are ads, not independent tests, so they say nothing about how the console behaved in a room. What they do show is that Yamaha was promoting an M1500 series through the mid-1980s, and that the company positioned it as a line rather than a single box.
The "series" framing points to the central difficulty with this model. A surviving Yamaha console brochure describes a family of three mixers built around the same platform: a 16-channel M1516A, a 24-channel M1524, and a 32-channel M1532. According to that document, all three consoles share remote rack-mounted power supplies and were pitched at fixed or portable sound reinforcement and broadcast work.
"M1500" has been used across Yamaha's catalog for more than one kind of product. Any research on a specific unit needs to confirm what it actually is before applying specs. The mixing-console identification is the one supported by the period advertising, but a buyer should verify the chassis in front of them rather than trust a model number alone.
There is a further trap. A substantial body of M1500 documentation in circulation is not Yamaha's at all. It belongs to the TASCAM M1500, a completely different 8-track recording mixer from TEAC's brand. Those TASCAM materials describe sweepable midrange EQ, four-buss architecture, in-line monitoring, and a comprehensive monitoring matrix, and they are frequently misfiled under "M1500" in scanned archives. None of that applies to the Yamaha console, and repeating it as Yamaha specification would be an error. The two products share a number and nothing else.
What the Yamaha M1500 sounded like, what it cost, how many channels the base model carried, and when production ended are all undocumented in the available record. Pro-audio consoles of this era were sold into install and touring markets, used hard, and rarely preserved with the care given to home hi-fi, so the paper trail thins out fast. Owners chasing service information should expect to work from the unit itself and from whatever Yamaha professional-audio documentation can be located, because the trade-press record offers little beyond the advertisements.
The advertising establishes the M1500 as part of Yamaha's mid-1980s console push, and the brochure confirms a modular family with outboard supplies built for reinforcement and broadcast duty. Everything past that - the actual circuit topology, the channel count of the specific unit, the condition of the power supply - has to be established by inspection.
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