All the tight punch and moaning sustain of the original 350, including sidechain effects loop, effects blend control, limiter with defeat, cooling fan with defeat, and tuner send. Now with added Mo'Bass-type SubWave suboctave and variable XLR. 350W RMS into 4 ohms, 450W into 2 ohms. EQ with variable mid for precision tone control. For professional use, the 350x is designed for easy installation in ATA rack cases. 19"W x 3-1/2"H x 12-1/4"D. 17 lbs.