I received this Yamaha NS-SW050BL subwoofer today. Connected, system calibrated, tested. This is a fantastic little subwoofer for my space (about 15ft x 30ft). I raised it to the THX reference level and it hasn't changed. None of the drivers on my system sounded because of this. I've set other speakers to roll off at 85Hz. These are not THX speakers, but the amp treats them as such due to the bass roll-off. Everything sounds clear, detailed and warm. Happy with my purchase!
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