When using a ha3500 head and a 410xl cab, i get 240w @8ohms. if the load is 4ohms I get 350w (as im sure you are aware). My query is this: how should I attach the extra cab (to total 4ohms - two 8ohm cabs)? the amp has two outputs, but using the spare output would just give 240 through another 8ohm cab, no? The 410xl has TWO inputs, and I heard that by putting the extra cab (say a 210xl) in the spare speaker input would equal 4ohms. but would the 210 sound louder than the 410? the sockets on the 410xl are not labelled, so does it matter which i puug into what? the amp works through either. I have typed this in a bit of a hurry and I hope it makes sense! If you know what the hell im going on about, please help. Cheers, chris.