Even with sub set to off a sub signal is still sent out. I tried with speakers on lg/sm and with sub on off/LFE only/LF+sub(obviously this one will always send a signal)
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Sonus Faber Grand Piano mains/center
Outlaw Audio LFM-1 x2
Definitive Technologies Protower400 surrounds
Outlaw 990 and 7500
Signal Cable speaker cable
outlaw audio interconnects