The Max 158 bass combo amp is a 20 watt 1x8" bass practice amp loaded with features, including 1/4" input and Volume with TransTube distortion boost and psycho-acoustic low end enhancement, a 3-band EQ, chromatic tuner and 1/8" jacks for phones output and auxiliary input. The Max 158 also includes Peavey-exclusive DDT speaker protection. 20 watts (rms) into 4 ohms 8 inch speaker Low, Mid, and High EQ controls Volume control with TransTube® distortion boost Psycho-acoustic low end enhancement 1/8" phones output 1/8" aux input Built-in chromatic tuner DDT™ speaker protection