AudioSource Preamp 5.1 Modular Preamplifier Dual-channel stereo preamplifier for connecting modular amps and equalizers to source component Gives listener greater control over system configuration and audio performance 10 Hz to 100 kHz frequency response; total harmonic distortion of 0.008 percent 2 XLR/balanced inputs and outputs and 2 RCA/unbalanced inputs and outputs Includes system volume, bass, treble, and balance controls; 7.13 by 16.5 by 2.25 inches (W x H x D)