My Sega CD PCB Works

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Richmond, CA
A Sega CD on top of a Sega Tera Drive on top of a PCjr on top of a PVM playing the Sonic CD intro The PCB I designed that makes it possible to connect a Sega CD to a Tera Drive

My PCB works and I've already discovered that the output audio levels from the Sega CD are much too low.

Does anyone have a reliable idea of what the 32X outputs Vpp? To be correct, I need an amplifier to match that. Best source I have is "+/- 2V" which is probably +4dBu or 3.472Vpp. The voltage level of the Sega CD is pretty exactly regular line level, but the cartridge input expects something larger.