I donut understand. Here's the scoop...I'm trying to run a cheap 10" speaker off my PV nitro head for practice situations. The head is rated for 180 w into 8 ohm and the 10 is an 8 ohm, 180w RMS full range driver. I set it up in a nice big ported box tuned to 42 Hz. Now I turn the preamp gain on the old nitro up to about 3 (I leave the power gain on 9) and the ddt (clipping) light comes on at low frequencies (mostly low E and below). My question is what causes this? a) The amp b) The speaker c) The combination of the two d) The alignment of the Planets in the cosmos e) Carrots Any more specific and technical confusion you can add will be greatly appreciated.