Help with dip and peak

[bryankes]

Hi,

New REW user here. After sufficient practice was able to get representative SPL measurements with REW and UMIK. Measurements were pretty flat when taken directly in front of each speaker. Setup is 19' x 13' rectangular room with high ceiling, speakers on long axis (no choice) 74" from side walls, 72" apart, 35" from back wall, and about 96" from listening seat.

Ignoring the ugly humps at 45 and 65 Hz for a moment, I can't seem to make a dent in that dip between 90 and 300 Hz by even extreme speaker movement- from all the way against the back wall, to 5 feet out into the room, to even moving the mic only 6 feet away. Assume this is due to floor bounce? Have a heavy rug but maybe not heavy enough? Any ideas would be most welcome. Thanks very much,

Bryan

 

[Sonnie]

The response should change with speaker movement, at least some, but it could be the listening position.

Can you move your listening position forward a bit? What does the seating and room look like?

miniDSP maybe to add PEQ filters, unless you can create and load them in your software.

 

[JStewart]

I can't seem to make a dent in that dip between 90 and 300 Hz by even extreme speaker movement- from all the way against the back wall, to 5 feet out into the room, to even moving the mic only 6 feet away. Assume this is due to floor bounce?

I think that area is to wide to be from floor bounce exclusively.
What model of speakers are they?
To Sonnies point, if the response doesn't change much from moving the speakers, move the mic closer to the speakers and see what you get. It may provide a clue. Also measuring each speaker separately may provide a clue.
When saving REW graphs you can use the camera icon and the legend will be saved as well. Some more detail in the low end on the graphs may also be useful. You can use the variable smoothing option.

 

[Johnnie]

Hi,

New REW user here. After sufficient practice was able to get representative SPL measurements with REW and UMIK. Measurements were pretty flat when taken directly in front of each speaker. Setup is 19' x 13' rectangular room with high ceiling, speakers on long axis (no choice) 74" from side walls, 72" apart, 35" from back wall, and about 96" from listening seat.

Ignoring the ugly humps at 45 and 65 Hz for a moment, I can't seem to make a dent in that dip between 90 and 300 Hz by even extreme speaker movement- from all the way against the back wall, to 5 feet out into the room, to even moving the mic only 6 feet away. Assume this is due to floor bounce? Have a heavy rug but maybe not heavy enough? Any ideas would be most welcome. Thanks very much,

Bryan

Is your sound running through Audyssey or another software calibration? If so you can get and run the calibration through the app and change your curves afterwards to make adjustments

 

[perceval]

One more thing...

Do not try to adjust the dips... you will run into distortion trouble fast.
Instead, lower all the peaks so that the dips blend in. That will be clean sound.

And follow the suggestions above, try to also change your listening position.