why would one front speaker have a 70hz drop and other 124hz drop

[rexscates]

why would one front speaker have a drop at 70hz and other drop at 124hz. both drops are about 15-18 Db's. When I average the two together its close to combined reading but not the same.The average has drops of only 5 dB or so. the combined does not have either drop but a small drop at 100hz as explained below.

i swapped speakers and the drop is depenedent on the speaker location not the speaker itself.
I moved the sound meter it had only minor effect.
I opened the door to the treated theater and it had only minor effect
I only had one speaker on each time when measured so its not a effect on each other.

when i had both fronts and the sub on the drop as at 100hz. which is exactly half way between both speakers drop. now I was using the ramp up sine wave part of rew (standard mesurement effect from program) so i dont think that is the isssue.

the amp has no equalizer function set. I will confirm that. I think i have it all eq effects turned off.

any ides? its a treated theater. with 4 corner base traps, and all alls have 1" 304 insulation up to ear level. with front the 304 all the way to the celling. The one window has treating.
weird I can figure out why one side is so differnt than other.

any ideas before i expend more brain power.

ttyl
rex scates

[brucek]

i swapped speakers and the drop is depenedent on the speaker location not the speaker itself.

That's to be expected. You've answered your own question.

Certainly you can design a room with an even distribution of the various modes, and treatment helps to smooth the response, but its tough to remove every null and peak location in the room. You'll have to try and move the speakers around a bit to get the best spot for them. You can also move the listening position..

brucek

[rexscates]

well thats a relief. well kinda
so a balanced center listening position is not allways the best? I will need to move the sound meter round and check out other locations. I tried to make sure both sides of the room were built the same and that the room was equally sealed.

also what I may be observing is the result of reflections and not true direct sound from the speakers themselves? If so I didnt expect it to be tht big of a effect on the REW program

thanks

rex