Here's a hypothetical that I need a reading on from you amp tech gurus (apologies in advance if this has been answered at some point in another thread, but searches didn't turn anything up): I have a 350w RMS @ 4 ohms, 450w @ 2 ohms, combo amp which has 2x10 drivers rated at 4 ohms. I plug in an extension cab rated at 4 ohms, so the combo's head is now running at 2 ohms. Then I hit the "internal speaker defeat" switch, silencing the 2x10s while keeping power to the extension. Here are the questions: 1. Is the head still running at 2 ohms or 4 ohms? and 2. Is the extension drawing 225 watts, 350, or 450? I can actually disconnect the internal 2x10s at the speaker jack, and if I do then presumably the head is running at 4 ohms and the extension is drawing 350 watts. I'm just wondering if by killing the speakers with the switch but leaving them plugged in, it's possible to "cheat" the system, running the head at 2 ohms and directing the full 450 watts to the extension. My guess is that it's not and that it's still only getting 225w, but the signal sounds much cleaner at higher volume with the 10s defeated, so I thought I'd ask. Thanks!