Well today I was setting my amplifier up in my car. To do this I was using a Tektronic O-scope from work. I found that when playing my Test CD(Autosound 2000) at 40Hz 0dB, everything at flat and at 0 on the D3. The preamps don't clip at full volume (40). The D3 puts out right around 4.1 V pk-pk (1.4 Vrms). I didn't check to see at what volume the internal speaker amp starts to clip, but by the sound of the music I'm sure it starts to clip sooner then full volume. So for all of you out there at don't use the internal speaker amp, you can set your amplifiers up at full volume (40). Tomorrow or maybe later tonight if I get bored I will go and see at what volume the internal amp starts to clip at.