The latest Dynaudio amplifier technology is mated to the exceptionally large woofer of the Sub 600. Delivering 300 Watt output power, the amplifier circuit features select components and was developed in collaboration with the Dynaudio Professional team, itself responsible for some of the finest active monitor speakers available in the studio market. In addition to the high quality and performance, the amplifier circuit incorporates a selectable Auto on-off function, variable gain setting, a variable Low-Pass Filter (50 Hz to 150 Hz), and a selectable phase switch (0º or 180º). The signal can be fed from an AV Receiver's subwoofer or LFE output into the Sub 600's LFE input (1 x RCA), or from a Stereo Amplifier's Pre-Out into Sub 600's Sat/Sub stereo input (2xRCA) A selectable High-pass Filter (Flat, 60 Hz, or 80 Hz) enables the Sat/Sub input to facilitate a seamless crossover integration between the main speakers and the Sub 600. Incorporating a subwoofer to augment the low frequency performance of any stereo or multi-channel loudspeaker system offers an additional benefit: by reducing the strain on the speakers in terms of reproducing extreme bass information, the overall quality of lower midrange frequencies and the overall soundstage reproduction can be greatly improved.