Silent practicing is also possible if you disconnect the speaker output and use only your headphones. Features: ultra-portable, lightweight bass amplifier head solid state design, class D amplifier circuitry 200 W at 4 ohms / 130 W at 8 ohms 3 band EQ with /15 dB cut/boost per band 6.35 mm (1/4") headphone output for silent practice post EQ balanced XLR DI output with switchable ground lift more than 10 Mohms input impedance provide maximum sensitivity for passive pickups front panel controls for Gain, Bass, Middle, Treble, Master rear mounted Ground Lift switch rear mounted Power On / Off switch front connections for 6.35 mm (1/4") instrument input and 6.35 mm (1/4") headphone output rear connections for mains in (IEC socket), 6.35 mm (1/4") speaker out and balanced XLR DI out dimensions (L x W x H) 170 x 118 x 45.5 mm / 6 11/16" x 4 41/64" x 1 51/64 weight 0.96 kg / 2.12 lbs incl.