PEAVEY MAX 158 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. - 8" SPEAKER - VOLUME CONTROL WITH TRANSTUBE DISTORTION BOOST - 3-BAND EQ - PSYCHO-ACOUSTIC LOW AND ENHANCEMENT - 1/8" PHONES OUTPUT - 1/8" AUX INPUT - CHROMATIC TUNER - DDT SPEAKER PROTECTION - TONE, POWER AND PORTABILITY!!!