Does the auto EQ really work? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 13 Old 05-20-15, 09:35 AM
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Re: Does the auto EQ really work?

Quote:
Glimmie wrote: View Post
Right, we should just ignore these entries in the list. However it does point to a bug in the software, hopefully harmless.

I was trying to EQ a large peak downward and REW only suggested 2 filters, both of which had 0.0 gain.

It didn't make any sense.


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post #12 of 13 Old 05-20-15, 04:06 PM
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Re: Does the auto EQ really work?

There could be a bug of course, but problems with the EQ are usually down to the settings being used. Best to use the latest version of REW, which is 5.11.

The optimiser makes an initial approximate assignment of filters then adjusts their gains, bandwidths and centre frequencies to best match the selected target curve whilst meeting the gain constraints selected. That might mean that one of the initial filters selected doesn't make a useful contribution when others have been adjusted so its gain could be set to zero to remove its contribution. There is an equaliser preference setting "Drop filters if gain is small" which will automatically remove any filters whose gain is less than half the flatness setting.

If the EQ does seem to be going wrong post the file and the target/EQ settings being used and I'll be happy to check whether it is behaving as expected.
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post #13 of 13 Old 07-13-15, 12:52 PM
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Re: Does the auto EQ really work?

Good afternoon gentlemen.. I think maybe this is a first post for me. I'm one of 'those' car-audio guys learning REW, but I'm certain I'll be using it for home theater as well hopefully sooner than later.

On the subject of Auto-EQ, is there a good singular thread that explains in in the forum, or maybe a vid etc for the EQ section of REW specifically?

I made a feeble attempt at it last night measuring a front 2-way system (mid and tweeter), doing A (left) and B (right) pairs from averaged sweeps to attempt to have REW recommend EQ trims which it did. Results were iffy at best and not sure how to apply the trims (left/right/both?) so I'm thinking it's something I did incorrectly I imagine.

I will say my current tune was very successful using the steps in Kyle Ragsdale's youtube videos, after getting timing and phase correct, doing individual driver EQ's, then driver pairs and left / right groups, via a Helix DSP. I guess this method is not uncommon, by a moving-mic and pink noise averaging (I'm sorry if there's a simple term for such method.. I don't know the lingo).

As a tool, I'll say REW is truly a beast I hope to master with knowledge. With a UMM-6 or IMM-6 (I have both), I've gotten through the basics of measuring and RTA sections, but looking into learning that next step in what REW can do in the EQ tool.
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