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  Topic Review (Newest First)
07-13-15 12:52 PM
Babs
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.
05-20-15 04:06 PM
JohnM
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.
05-20-15 09:35 AM
subterFUSE
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.


Sent from my iPad using Tapatalk
05-19-15 08:17 PM
IslandHydro
Re: Does the auto EQ really work?

I tend to agree, auto filters just didn't seem to do anywhere near as well as I could do with manual filters. It could be I'm not properly configuring the objective curve but I gave up and did mine manually throughout, with great results I might add.
05-19-15 08:14 PM
Phillips
Re: Does the auto EQ really work?

I understand it is limited due anyone putting boost to that range where damage could occur.
05-19-15 01:34 PM
Glimmie
Re: Does the auto EQ really work?

Quote:
BlueRockinLou wrote: View Post
I would imagine that the filters default to zero gain. So there's not really any "programming" to do. Just leave any non-zero filters alone.
Right, we should just ignore these entries in the list. However it does point to a bug in the software, hopefully harmless.
05-19-15 12:51 PM
Glyptoron
Re: Does the auto EQ really work?

The last one, Sir ! id est V5.11.
Beyond 10 kHz, as it is rightly pointed out, live field wavelength is so short that it hardly matters. A few centimeters outside the measurement axis and the measurement will be distorted. Moreover, now the limit is 20 KHz but my 63 year old ears barely hear 12 KHz with headphones!
05-19-15 12:05 PM
Lumen
Re: Does the auto EQ really work?

I would imagine that the filters default to zero gain. So there's not really any "programming" to do. Just leave any non-zero filters alone.
05-19-15 11:50 AM
Glimmie
Re: Does the auto EQ really work?

Quote:
Glyptoron wrote: View Post
Hello,

The EQ match range goes from 10 Hz to 20 KHz.

@+
What version are you using?

Mine stops at 10khz. You can put 20k in but it will default back to 10k.
05-19-15 06:55 AM
subterFUSE
Re: Does the auto EQ really work?

Quote:
Glimmie wrote: View Post

And I often get strange auto EQ settings with zero gain, IOW, they do nothing with zero gain. Is this a bug?

I was getting this just a couple of days ago.

When I ran auto EQ it would suggest filters with 0.0 gain.
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