It looks like the P7 is a multi-channel pre-amp, again I am only looking for a 2 channel.
Also the 2100 only has 1 set of main outs, I am looking for 2 sets of main outs, and a sub out.
Also the 2100 only has 1 set of main outs, I am looking for 2 sets of main outs, and a sub out.