This bass amp is from the Marshall brand, arguably the most famous amp maker. It features two channels, MODERN and CLASSIC, allowing for a wide range of sound creation. With a single 10-inch speaker, it gives the impression of producing a sound that firmly covers the bass frequencies. With a 30W output, it can be used at home as well as in small live performances. I have actually connected a bass and confirmed that it produces sound, and all controls work without any crackling. There is some dirt on the control panel and some lifting of the exterior on the back, but it is generally in a clean condition. Shipping is free! Please consider it. m(__)m The following is a reprint from the official website: Similar to the MB15, it has a 2-channel specification and is equipped with one 10" speaker. It is ideal as a practice amp, but it also demonstrates outstanding power in small gigs. The MB30 is equipped with "Voice Shift" and an effects loop, allowing for a more diverse sound creation. You can switch channels with a separately sold footswitch. SPEC General MODEL MB30 (Discontinued) RANGE MB TECHNOLOGY SOLID STATE CHANNELS 2 Electronics WATTAGE 30W INPUTS 1 (+AUDIO) CONTROLS VOLUME x 2, COMP, GAIN, BASS, VOICE SHIFT, VOICE, TREBLE Speakers SIZE 1 x 10" OUTPUT POWER 30W NAME IMPEDANCE Valves N/A Footswitch & Accessories FOOTSWITCH CABLES POWER Dimensions WEIGHT (KG) 14.8 DIMENSIONS in mm (W x H x D) 440 x 410 x 260 Other MASTER VOLUME EFFECTS EFFECTS LOOP YES UNIQUE LINE OUT, HEADPHONES OUT, FX LOOP