A quick questions in regards to Amps. The audio installer is recommending the JL 4 channel amp rather then the PDX 5 for powering 4 speakers and a sub. He's saying that even though the PDX 5 is a 5 channel, the JL 4 channel can handle the JL C-5s (75rms), C-2s (35rms), and JL sub (250RMS); and...