This low-frequency energy and stereo image enhancement system provides planet-rattling bass while simultaneously causing the vocals to stand out in a mix and spreading the stereo image. Sub-harmonic (QUAKE) processor watches the source material, analyzes the bass, then generates additional low frequencies an octave below it. It tracks the original bass without the mud of other bass processors and tunes to your speaker size for best performance. The QUAKEs activity is indicated by an LED. Fully adjustable output level. Additional bass boost circuit -- THUD -- is tuned an octave above the sub-harmonic range and can be used to fill in and fatten out the low end. The left/right stereo image can also be intensified with the XPANSE control, which gives improved separation and clarity (atmosphere). All inputs and outputs are balanced. Input gain control, 0 dBu green signal LED and +10 dBu red signal LED assist in input level setting. The subwoofer output has its own crossover and level control which supplies an equalized bass signal for systems with subs. The effects (including the added QUAKE and THUD signals sent to the subwoofer) can be bypassed.

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