Alright, just measured my RCA #3 (underseat woofer left). Test tone (sine wave) playing 63Hz. HU volume around 45 clicks. MS-8 volume -10dB. Digital VM in AC mode, reading 0.02V.
Do this on your end, then report back.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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