Low Down HD750 Bass Amplifier 750 watts of power at 4 ohms 5 Incredible Bass Amp Models: Clean, R&B, Rock, Brit, and Grind; 5 Essential Bass Effects: Synth, dedicated studio-grade Compressor, Envelope Filter, Octaver, and Chorus; Deep Switch with special tone shaping for supreme fatness 2 Neutrik four-pole mono speaker outputs; XLR direct out with exclusive Line 6 A.I.R. processing; Headphone out; CD/MP3 1/8 input for working out parts on the bus or in the hotel; Footswitch jack for FBV Express or FBV Shortboard Built-in chromatic tuner; 4 programmable channel memories, 36 with FBV Shortboard 20 lbs; 19" W x 5 1/4" H x 9 1/2" D; 3U rackmount 750 watts of power at 4 ohms 5 Incredible Bass Amp Models: Clean, R&B, Rock, Brit, and Grind; 5 Essential Bass Effects: Synth, dedicated studio-grade Compressor, Envelope Filter, Octaver, and Chorus; 2 Neutrik four-pole mono speaker outputs; XLR direct out with exclusive Line 6 A.I.R. processing; Headphone out; CD/MP3 1/8 input for working out parts on the bus or in the hotel; Footswitch jack for FBV Express or FBV Shortboard Built-in chromatic tuner; 4 programmable channel memories, 36 with FBV Shortboard 20 lbs; 19" W x 5 1/4" H x 9 1/2" D; 3U rackmount