The VS-880 inputs are UNBALANCED, and are susceptible to noise. Keep the cables to the VS-880 inputs as short as absolutely possible.
The input impedance (Z) of the VS-880 is on the order of 10,000 to 20,000 ohms (low-Z), which means that a pre-amp is recommended to help preserve the tone of high impedance instruments such as guitar and bass.
Nick G.
1997/12