Well I have a few questions that may seem amusing, but i'll ask them anyways. First off, is there any way you can you run a speaker cabinet off of a Sans Amp bass driver D.I.? If an amp is rated at 400 watts does that mean at 8ohms/4ohms, or what?Also if you have an 8 ohm speaker in your amp and you change it with a 4 ohm speaker will that double yor volume, or at least make you louder? What makes an amp ported? And finally, lets say an amp pulls 400 watts of power and only gives out like 150 or so, when they rate an amp in Musicians Friend do they give the actual watts of sound, or just what it takes in electricity to run (ie:400watts=150 in actual sound). I'd appreciate answers to any of these questions.