I have not yet set levels using an SPL meter...I just got one last night and will do that this Sunday when I return home. I have verified using the Harman Kardon reciever test tones that all speakers are connected correctly. I am using Harman Kardon RB-25's in the front and RS-25's for surround and the center is an RC-25 (so all should match). I am using an optical cable from my Sony 5 disc DVD player (which is setup using the menus for dolby digital, DTS, etc.) and when playing DVD's, I am getting Dolby Digital (LCD on reciever shows Dolby Digital and all five speaker location are highlighted and letters are in each speaker). The DVD player is a little over a year old. Could it be the DVD player? Also, all speaker sizes and crossovers, etc. are done with the reciever (when connecting the DVD player to a reciever using an optical cable, those menus are disabled on the DVD player). Speakers are set to small and crossover is set at 80Hz.

I am pretty much stuck with placement of the speaker. The left and right speakers are about 14 apart with the center channel off center to the right about 4 feet from the front right speaker...this is where my tv sits because of a fireplace in the middle of the front wall. I am not sure if my HK AVR-635 has a center channel EQ...I don't beieve so.