I put this up on AVSforum, and I figured I would see what the members here thought also.\nI was trying to answer another member's question about getting an amplifier vs. just using the receiver. I looked up the power needed for my speakers using the Peak SPL Calculator (hometheaterengineering.com) that is recommended. So putting just two speakers in the calculator and adjusting the watts until I got down to 60db at listening position, I got to .008 watts needed. I used 60db as I listen usually around -15db. Calibrated at 75db, so -15 from 0 would be 60db. He answered, correcting me, that the test tone in the receiver is recorded -30db from reference, so I would need to be at 90db at my listening position, instead of 60db. Reference being 105db, if calibrated at 75db. In that case, I would be at 8 watts to get 90db at listening position with 2 speakers. He also stated I should use only one speaker in the spl calculator. I didn't want to hijack his thread, so I am starting a new one.\n\nQuestions are:\nShould I use one speaker in the calculator to get the closest needed wattage rating?\nOnce a movie is started, is it at 105db at reference, so 90db for me, or is that accounting for peaks?\n\nHopefully, it is not too confusing.\nThanks.