this amp will run on 18650 li ion battery's - 15 of them . it will also have a built in crossover ( switchable so you may bypass that) to utilize a tweeter if you'd like. a tweeter is good when you use a modeler . this is not a tube tone vintage amp . it is a powered speaker for use ONLY with an amp modeler and a cab sim . i tested this speaker cabinet with a tonemender circuit and a class d amp with a tweeter and it sounded good . the plan is to build all of that crap into this smaller more sensible battery powered all in one ( except for the tweeter and the amp modeler) portable package. if you are looking for tube tone you are in the wrong place .