Good for the ultra lows. Not good for the mid lows. I have a 1234; 465 watt Polk that fills in the middle. I also have 4 6.534; woofers in my JBL towers to broaden the sound stage. If you only have this woofer you will work it really hard. You have to turn the gain way up and then it will sound nice for about 1/3-2/3 of the time. I would recommend using another smaller subwoofer with and blending the two together. It is perfect for that scenario. For $180.00 a sure fire hit. Just don't expect too much. It is wonderful when used as part of a BASS ARMY but so good as an Army of One.