Unlock the full potential of KEF Custom Installed subwoofers with the DSP controlled KASA500 Class-D Dual 250WPC amplifier. Our Rough-In-Fames reserves the perfect space for the speakers during a new construction build. When constructions or building codes dictate, our metal rear enclosure is available for easy installation. Rear enclosures may help to mitigate some mid and high frequency sound transfer into other rooms.