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Harman kardon 680i verses Pioneer SX980 — Polk Audio Forum
Harman kardon HK 680i Vintage receiver hi-end - audioweb
HK 680i Prospekt
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Harman kardon 680i verses Pioneer SX980 — Polk Audio Forum
Harmon Kardon hk680i : r/vintageaudio
Harman/Kardon HK 680i | hifi-wiki.com
New receiver. HK 680i : r/vintageaudio
