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