Onkyo ES-600PRO (circa 1993)
Little is documented about the Onkyo ES-600PRO, and most of what is known comes from a single period source. HiFI-Stereo's 1993 signal-processor roundup (p.125) lists it as a "Surround Processor Amp" with a Dolby Pro Logic and Dolby Surround decoder, discrete output stages, and a "Hall" surround mode. The OCR cuts the entry off mid-description. It appeared alongside Onkyo's FX-3000, a $300 surround processor. That suggests the ES-600PRO sat above it in the line, and the ES-600PRO was listed at $1,695.
No production years, full specifications, or owner documentation for the ES-600PRO have surfaced. Around the same period, Onkyo's own advertising in Audio (March 1992, p.63) and HiFI-Stereo promoted its A/V separates approach - dynamic power into low-impedance loads and adjustable rear-channel digital delay. Those are brand-wide claims, not confirmed ES-600PRO specs.
If more documentation exists, it hasn't made it into the Archive yet.
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