KEF PSW 4000 Subwoofer

The impressive KEF PSW 4000 subwoofer is although finished with unnatural veneer, but looks respectable due to the black polished top panel and high chrome-plated support cones. Both the 30-cm driver and the giant curved bass-reflex port are on the bottom. Amplifier is 500W, pulse. Here are balanced and linear inputs (outputs are not provided), frequency response and filter slope selector, and a smooth phase control. With such a choice of settings and switching capabilities, problems with matching should not arise, and in fact, it is the guarantee of high-quality bass.

And so that exactly how it happened: KEF PSW 4000 turned out to be powerful, but at the same time pedantic assistant, both when working with closed speakers and bass-reflex systems (thanks to the switchable filter slope). I think that you also will have no problems with large outdoor loudspeakers that reproduce bass from 40 Hz.

Switching the subwoofer to the Cinema mode presented a not very pleasant surprise: the room roared with resonances falling on the same frequency. In my opinion, this mode is not suitable even for Hollywood effects. In Music position everything came into harmony again, self-control came back to the subwoofer. "Breathing" of the bass-reflex is not audible at all, and the presence of resonance at the port setting frequency will unlikely worsen the reliability of the lower-case reproduction, because there are almost no such bottoms in a real musical signal.