Fell down a Quadraphonic rabbit hole a few years ago, and this is where the setup is at now : r/vintageaudio

Customer Reviews: Cambridge Audio AXR85 Stereo receiver with

CDs & Online Albums New Adventures in Sound Art

HiFi News 2013, PDF, Loudspeaker

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Muzishare tube amplifier I need some help troubleshooting my X7

Emperor of Test Equipment - Home

diyAudio

diyAudio

Average White Band - AWB (Quadio) (Blu-ray Audio)