Now that I bought the Yamaha 1400, I wished I should have went pre/pro instead. Can I just add an amplifier to it and just use the yamaha 1400 as my processor instead of buying another one. If so, what pre amp can I pair with the yamaha 1400. Will it make a big difference in sound? Is it worth doing it? All comments are welcome and appreciated whether positive or negative. And if there is a link for this subject matter please let me know. Thank you.