A subwoofer is a more specialised woofer unit. It's capable of producing even lower-pitched sounds than a standard woofer.
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Yamaha True X Surround 90A review

At £2499 / $3500 / AU$4499, the True X Surround 90A is a pricey bit of home cinema kit. You can forget the likes of the ...
Voice, touch and automated triggers blend invisibly with the architecture in the Modern Lakefront Intelligent Estate, ...