On Order. 45 Day Lowest Price - 100% Satisfaction Guarantee. The Power Engine 60 is 1x12 open-back, extension cabinet. It packs 60 watts of transparent power and has a special design speaker, individual level control, 3-band active tone controls, and balanced XLR input, 1/4" input and balanced XLR output. The Power Engine 60 matches and complements our Trademark 60 two-channel, combo amp.