![]() Technical Design The SPX900 uses an 8-bit microprocessor the HD6306, which is a derivative of the Motorola 6800 running at 4Mhz and with a 32kbyte ROM chip holding the main OS. I managed to straighten them out but they have cracks in the metal now. It is always important to protect rack ears when packing a unit to avoid this. The SPX900 arrived without much packaging and the rack ears were bent back. The SPX990 is a 20-bit version of the SPX900, with the same DSP chip but more memory and effect types. With only a mono analog input and multiplexed stereo output it was eclipsed by the more powerful SPX1000 in 1989, which has 4x the sound memory and digital I/O but at twice the second hand price. Launched in 1988 (at overĀ£700) the SPX900 was Yamahas first full bandwidth effects processor with 16-bits at 44.1Khz. ![]() ![]() The plan is to refurbish the SPX, and use it for delays with pitch shifting and the Symphonic preset. Introduction I bought a used Yamaha SPX900 multi-effects unit in December 2021 to complete the FX rack for my main analog console, the Soundcraft 22MTK which has five AUX sends. ![]()
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