Updated version of one of the most popular rack mount guitar power amplifiers that was designed to provide great flexibility and high reliability. It provides 55 W of power per channel into a 4 ohm load, or 40 W per channel into an 8 ohm load. The amplifier utilizes thermal protection circuitry, along with protection from over voltage, under voltage or any shorts to the power supply. This allows reliable performance night after night without the stress of losing the sound. A front panel power switch and two front panel volume control knobs make operation as easy as possible. The Channel 1 Level knob adjusts the output level (or overall volume) of channel one. The Channel 2 Level knob adjusts the output level of channel two. The Resonance control particularly beefs up the lower range, giving the amplifier extra performance at the low end of the sonic spectrum. The Presence control opens up the treble and higher end, offering more "voice" for solo playing. The amplifier is also designed for easy operation. Replacing a fuse is a simple procedure as well and a compartment is provided for storing a spare fuse. Input impedance: 10k Ohms. Maximum input: +20 dBu. Maximum gain: 26 dB. Dynamic range: over 100 dB. Frequency response: +/-1 dB, 20 Hz-20 kHz. Dimensions: 19”single rack space, 190 mm deep. Weight: 4.53 kg.