Generating Simple Frequency Response Correction Filters using Room EQ Wizard 

Thanks. I really think that this is easy to do but the knowledge isn't common to many people who would be willing and able to take advantage of it. I'll keep making content in hopes that it reaches more people.

@@davidbrancato Your approach and explanations are very well done. I think anyone who watches your videos will benefit.

Cool I am glad this was helpful.

I have a video here that shows how I am currently using correction filters for two channel stereo with JRiver Media Center. I have not yet tried doing anything beyond 2.1 stereo, so for the time being it's just for any two channel setup. No bass management process yet.

Ah but I didn't export the original measurements to a wav file. Watch it again closely...

I have always made them the same. It never made sense to me to make them different!

I have. As it turns out, none of the methods I came up with that used FDW produced filters that sounded as good as these filters do. I think that simply using the psychoacoustic smoothing model on the measurements evens things out well enough.

@@davidbrancato Got it. Many thanks!

​@@davidbrancatodid you also try other levels of smoothing?

@@l.s.1709 Oh yes. The smoothing levels I'm using are the ones I've found to work best for me.

The use of a convolver is not necessary, no. However, if you want the best quality you are not going to get it without a hi-res impulse response in a high quality convolver. I used to use Equalizer APO when I got started. It has a built-in equalizer that does import the settings from text files. When I was new to this I thought that was great. I didn't even know that we could use impulse responses to get the job done. However, once I learned how to implement convolution I heard the difference immediately. It was like night and day. There was no comparison. Impulse responses fed into top-tier convolvers deliver pristine sound quality that those text-fed equalizers can't match. Additionally, with convolution you can correct the time domain as well as the frequency domain. That isn't even possible if you are only working with text data for eq bands.

@@davidbrancato yea, makes total sense. I am merely a home theater enthusiast trying to calibrate my system using a Denon 8500HA receiver/MULTEQ-X/MiniDSP 2x4HD; nonetheless, I think your view is worth exploring. I will let you know how it goes Thanks

​@@davidbrancatobut EAPO can also do convolution where you import wav files instead of text files

@@l.s.1709 It probably can, but I have always found Equalizer APO to be a clumsy and inefficient way of implementing DSP. The platform doesn't allow us to see what's happening in real time, only what's shown in "captures" of your settings.

@@davidbrancato which (free) tools do you suggest in that case? I'm still pretty new to DSP and installed EAPO on my PC and HTPC.

You're welcome. Yes I have seen what he's doing. I do this a little differently, though. I am still inverting the signal, just not the same way. I prefer to generate correction based on a smoothed response, either around 1/6 or psychoacoustic. My filters all end up as impulse responses, so the fact that they are generated with REW's bi-quad filters isn't relevant.

A convolver is a processor that takes an input signal and translates it through an impulse response. The process is called convolution. Usually this is used as a studio reverb effect to place a sound source into another acoustic space without actually having to go to the physical location. Take a look at Altiverb and you'll get the idea. The convolved IR is blended with the dry signal as a reverb effect. What we are doing with room correction is essentially the same. We take our input signal and process it through an impulse response of the correction needed to fix the issues our speakers exhibit in the room. The only difference between this and the reverb effect is that we do not want any of the dry signal. All we want is the corrected "wet" signal. That's basically what's going on.