That XTZ sub works well for music, but looks are what they are. Like most other commercial subwoofers.
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Buy two.
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Dynavoice has entered the HiFi market by offering affordable, good HiFi stuff:
Dynavoice Challenger Sub-10 är ett perfekt val för dig som vill ha en kraftig och lån...
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Edit:
Maybe goes down to around 30 Hz, which is enough to listen to most music.
Small sealed subwoofers have to work hard. I wouldn't have chosen one with a 180 W amp like it has, but two such pieces can be good. It depends on what volume you usually play at.
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Edit:
It applies to the entire solution. The amp and speaker driver (in the small box) have to work hard with a small sealed sub. Increased risk of driving the amp into clipping (if there is no built-in limiter) plus the speaker element together with the solution can distort (fortunately we are less sensitive to distortion in the lower registers, but sooner or later the distortion becomes audible).
(amp clipping sounds much worse than speaker distortion, normally)