The Rolls RA163 is an eight channel distribution amp. It has independent volume attenuation for each channel, and 1X8(mono) or 2X4(stereo) compatibility. Balanced XLR jacks for all inputs and outputs. The RA163 also has volume knobs on the front panel and access to the stereo/mono switch. The chassis is made of powder coated steel and uses an IEC 120V power cord, no wall wort adapter with this professional grade distribution amp. Designed for installations where you need to send a line level signal to more than one amplifier with NO SIGNAL LOSS or impedance issues.