I would give this 5 stars but the fact you cant plug an AC block into it a a big deterrent. I play bass but have been fiddling with Bi amping and this really does a great job. Im going to try and find a way to connect a wall charger to it as Im pretty DIY handy and know how to solder. You will get a tiny bit of noise when both amps are hooked up but nothing unbearable for the price point