Some questions about generating PEQ filters for a sub - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 04-04-2020, 09:33 AM - Thread Starter
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Some questions about generating PEQ filters for a sub

Hi everyone, I am using a MiniDSP 2x4 HD to integrate an REL T9i with a pair of LS50s for a desktop setup. I am using REW and a UMIK for setup. My steps so far have been to independently measure the left and right speaker and generate some filters for under 1000hz. Overall and Individual Max boost are set at 0. Allow narrow filter below 200hz is checked and so is Vary max Q above 200hz. I have a house curve file added.

Question #1 : Since the sub is essentially doing bass management, when I go to measure in REW should my output be set to L+R and not just one channel? I definitely measure louder when I select L+R. When I press calculate target level from response it is fairly low when only selecting one channel. I made sure to calibrate the L +R speakers to around 75dB before testing. How do I properly figure out what my sub level should be. It is slightly higher than 75dB if i select L+R for the measurement.

Question #2 : When I am equalizing the sub, is is it ok to leave the overall and individual max boost at 0? I understand that those setting are basically just 'cutting off' the peaks but I seem to get better looking graphs if I allow boosts. The boosts aren't actually boosting any nulls or anything, it just appears that the boosts are being used to balance out some of the other filters.

Question #3 : Is this the correct process: measure one speaker at a time, generate EQ, Import EQ settings, turn on crossovers.

I have attached a picture of my EQ settings. The measurement you are seeing is an averaged response from 3 sweeps. No smoothing.
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post #2 of 5 Old 04-05-2020, 08:32 AM
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#2 – boosts are fine as long as it isn’t a null.

As for the rest, you can get all the help you need at this thread:

https://www.avsforum.com/forum/showt...0#post59449910

Regards,
Wayne A. Pflughaupt


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post #3 of 5 Old 04-05-2020, 10:54 AM
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I would start off by reading this awesome PDF guide by AustinJerry.
Post all your questions in respective threads.

https://www.avsforum.com/forum/91-au...l#post22823228

Then head over to this thread and watch the video (House curve starts at about 57:00)
https://www.avsforum.com/forum/113-s...k-through.html

If you ever end up having a theater with capable subs then you should try BEQ.
https://www.avsforum.com/forum/113-s...ed-movies.html

what-i-d-do-differently-next-timehttps://www.avsforum.com/forum/19-ded...l#post55641388
Epson Projector Power Supply Failure.https://www.avsforum.com/forum/68-dig...lure-rate.html
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post #4 of 5 Old 04-06-2020, 01:00 PM - Thread Starter
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Quote:
Originally Posted by avtvhdbass View Post
I would start off by reading this awesome PDF guide by AustinJerry.
Post all your questions in respective threads.

https://www.avsforum.com/forum/91-au...l#post22823228

Then head over to this thread and watch the video (House curve starts at about 57:00)
https://www.avsforum.com/forum/113-s...k-through.html

If you ever end up having a theater with capable subs then you should try BEQ.
https://www.avsforum.com/forum/113-s...ed-movies.html
Thanks for the links. I've read over most of the guide and I dont think I saw an answer to one of my main questions. Since REW is not capable of seeing my sub since im not using an AVR, im not sure if I should be choosing one channel or both channels when I try to set my levels for conducting a sweep. Im aware that I can just mute the other channels so they do not directly influence the test but that does not entirely solve the issue. There is definitely a difference of several dBs when I swap between L or L+R. If I was using REW with an AVR I could set to output to just the sub channel but Im not able to do that here.
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post #5 of 5 Old 04-06-2020, 01:48 PM
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Using L+R is definitely going to get more SPL. However, that is not the same as actual frequency response. Your L+R graph should look the same as the L measurement, only higher on the graph scale. So it doesn't matter which way you do it. I mean, you could do L-only and boost the signal level and get the same result.

Regards,
Wayne A. Pflughaupt


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