This multiband sound enhancer adds harmonics to the audio, which significantly improves the definition, warmth and transparency of the music. Soft or Tight bass processing: improves bass punch considerably! Enhancer/Exciter with multiband tuning from 1kHz to 8kHz. Separate surround processor for a wider stereo experience. Separate mono subwoofer output with adjustable (80 → 250Hz) cutoff frequency. Subwoofer phase inverter switch. Balanced XLR inputs/outputs.