Lexicon SPX-90
The Lexicon name on the front, the Yamaha name on the back - a naming collision that has confused buyers for decades.
Overview
Start with the name, because it's wrong. The SPX-90 is a Yamaha product, not a Lexicon one. Lexicon's own rack units from the same era carried designations like PCM70, LXP-1, and 224XL. A "Lexicon SPX-90" does not appear in the manufacturer's line, and no period documentation supports the combination.
What does exist is a well-documented mix-up between two brands that shared studio rack space constantly. The SPX-90 was everywhere in the 1980s and early '90s. It shows up in equipment inventories alongside Lexicon units so often that the two names got tangled in the secondary market. A 1989 Mix-Magazine (May 1989, p.48) piece describes the SPX-90 as one of the most-requested effects units at a major rental house. For around $600 a buyer got "three delay lines, four different reverbs, compressors, equalizers, all in one device." That price and that feature set belong to Yamaha's box, not to any Lexicon model.
This matters if you're shopping today. Listings that describe an "SPX-90" as a Lexicon product are almost certainly mislabeled, either by a seller confusing the two brands or by a listing aggregator merging search results. Lexicon built excellent digital reverb and effects processors, and the SPX-90 built a reputation of its own, but they are different machines from different companies. Buyers who want the Yamaha unit should search under Yamaha's name. Buyers who want a Lexicon should look at the PCM or LXP lines.
Because the documentation for a "Lexicon SPX-90" as such does not exist, this page does not list specifications, production years, original prices, or design details. Doing so would mean attributing Yamaha's specs to a Lexicon product, or inventing a Lexicon model that was never made.
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