Yes, single sweep of both speakers would tell a different story.
Can you repost that graph without lowering response of both speakers (plz apply 1/6 smoothing)? I think you have phase cancellation here:
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REW-Moving Microphone Method Help
- Thread starter Dj7675
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Yes, single sweep of both speakers would tell a different story.
Can you repost that graph without lowering response of both speakers (plz apply 1/6 smoothing)? I think you have phase cancellation here:
DanGuitarMan
Member
Sure:
Nope. Something is wrong again. You have to have app 6dB of difference between both channels and single channel response with LF and app 3dB in HF if all 3 measuremens are done with the same volume level.
It should look something like this:
DanGuitarMan
Member
I might have recorded these in different sessions while changing the gain. I'll double check.
DanGuitarMan
Member
The Left and Right were recorded one after another. Then the gain was adjusted down for the measurement of both. I aimed for 75dB for each measurement.
You can adjust your current graph easilly: make your left and right channel overlapped at HF and increase both channel response 3dB higher than L and R at HF.
DanGuitarMan
Member
And there's the phase cancellation betweeen channels so they are not adding up correctly and you're loosing bass:
Are you using EQ?
DanGuitarMan
Member
I am using subtractive eq to tame peaks, and a maximum of 3dB boost to fill in dips. They are shown with psychoacoustic smoothing, but you get the idea. Here's a corrected response and the eqs applied:
I see. So your previous graph showing L, R and Both is uncorrected? Can you post corrected version of L, R and Both?
DanGuitarMan
Member
Here it is with Var smoothing so you can better see the huge dip at 55Hz. I always chalked this dip up to room/speaker interaction and never tried to boost it. When I tried, I wasn't satisfied.
DanGuitarMan
Member
Do you have measurement of Both speekrs response with correction to add to that graph?
That dip may be due to speaer's positoning as well. Do you have a photo to show position?
Can you plz lower both speakers response so it is 3dB higher than L and R at 10kHz?
If phase of left and right speaker would be matched the response would look like this:
Unfortunately you cannot correct phase with PEW filtering, so re-positioning the speakers may be your only option. How close are they to the walls/corner?
DanGuitarMan
Member
DanGuitarMan
Member
Nice room!
What is the distance between the speakers and the distance from speakers to your LP?
Maybe you can try shifting them apart and putting them as close to the rear wall as you can.
DanGuitarMan
Member
Thank you! I'd love to try that. There are a few impediments: 1. WAF 2. We have a corner mounted TV that swings out and would cover the speaker if I were to do that.
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