Question about REW automatic equalization - Home Theater Forum and Systems - HomeTheaterShack.com

 1Likes
  • 1 Post By JohnM
 
Thread Tools
post #1 of 9 Old 05-25-17, 09:10 AM Thread Starter
Shackster
 
Join Date: May 2017
Posts: 12
Question about REW automatic equalization

Hi! I've recently bought an UMIK-1 to properly measure audio related stuff.

I have a pair of AudioEngine A2 connected to my PC and they had pretty bad bass resonance.

As such, I've downloaded REW and "Equalizer APO" to try and fix things.

Now, the result is quite nice, compared to before. But I'm not sure I understand the reasoning behind REW filters allocation.

So, this is the measurement I took, I calibrated for 75db as instructed here https://www.minidsp.com/applications...setup-with-rew

http://i.imgur.com/d1oiUdP.jpg

I then went to EQ and set up stuff as instructed here: https://www.minidsp.com/applications/auto-eq-with-rew

The resulting filters took care of the bass problems but appear to leave all the frequencies above 800Hz untouched. Is this correct? The response seems quite far from being linear:

http://i.imgur.com/BiyqQYZ.jpg

Any help? Be kind, I'm a total newbie concerning all of this. Thank you.

Last edited by gorman; 05-25-17 at 09:17 AM.
gorman is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 05-25-17, 09:19 AM Thread Starter
Shackster
 
Join Date: May 2017
Posts: 12
Re: Question about REW automatic equalization

Pictures fixed, now they should load correctly on click.
gorman is offline  
post #3 of 9 Old 05-25-17, 09:49 AM
HTS Senior Moderator
 
Wayne A. Pflughaupt's Avatar
 
Join Date: Apr 2006
Location: Katy, Texas
Posts: 8,929
Send a message via Yahoo to Wayne A. Pflughaupt
Re: Question about REW automatic equalization

REW is primarily looking for modal problems, which don’t occur in the upper frequencies.

Don’t even think you’ll be able to get away with applying 20+ dB of equalization to a speaker with tiny woofers and low-powered amplifiers. You can’t get any bass from those speakers – you need a subwoofer for that.

Regards,
Wayne



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
|
To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Wayne A. Pflughaupt is offline  
 
post #4 of 9 Old 05-25-17, 10:06 AM Thread Starter
Shackster
 
Join Date: May 2017
Posts: 12
Re: Question about REW automatic equalization

Quote:
Wayne A. Pflughaupt wrote: View Post
REW is primarily looking for modal problems, which donít occur in the upper frequencies.

Donít even think youíll be able to get away with applying 20+ dB of equalization to a speaker with tiny woofers and low-powered amplifiers. You canít get any bass from those speakers Ė you need a subwoofer for that.
It never occured to me (to expect extra low frequencies), AudioEngine provides these specs: 65Hz-22kHz Ī2.0dB and apparently they slightly exceed them, measuring reasonably flat till 55Hz or so. I'm new to REW not completely new to equalization, hi-fi and so on.

In fact my doubts concern the higher frequencies, not the lower ones. There's plenty of bass (for speakers this size and up to the frequencies it's reasonable to expect it at for the size) and the problems there were with it are indeed mostly fixed by using the EQ filters REW calculates.

What I can't explain is why nothing is done for frequencies above 800Hz, which show plenty of non linearity in their response and which, up to a certain extent should be less limited by the size of the speakers, as far as volume is concerned.
gorman is offline  
post #5 of 9 Old 05-25-17, 10:15 AM Thread Starter
Shackster
 
Join Date: May 2017
Posts: 12
Re: Question about REW automatic equalization

It's like REW, from 40Hz to about 800Hz strives to achieve the target level (set at 74.5). After that it ignores everything. There's probably a reason for this, I'd just like to understand it.
gorman is offline  
post #6 of 9 Old 05-25-17, 10:34 AM
HTS Senior Moderator
 
Wayne A. Pflughaupt's Avatar
 
Join Date: Apr 2006
Location: Katy, Texas
Posts: 8,929
Send a message via Yahoo to Wayne A. Pflughaupt
Re: Question about REW automatic equalization

It could well be that I’m missing something, perhaps John will show up and comment. In any event, it’s easy enough to equalize the highs in real time using the RTA feature.

Regards,
Wayne



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
|
To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Wayne A. Pflughaupt is offline  
post #7 of 9 Old 05-25-17, 10:53 AM Thread Starter
Shackster
 
Join Date: May 2017
Posts: 12
Re: Question about REW automatic equalization

Quote:
Wayne A. Pflughaupt wrote: View Post
It could well be that Iím missing something, perhaps John will show up and comment. In any event, itís easy enough to equalize the highs in real time using the RTA feature.
I'm trying to understand how (from the manual) but I'm afraid this flies over my head.
If I raise the "individual max boost" and "Overall max boost" the curve is smoothed more evenly, with filters acting on higher frequencies... but then everything sounds *wrong* with far too much highs.
gorman is offline  
post #8 of 9 Old 05-25-17, 12:42 PM
REW Author
 
JohnM's Avatar
John
 
Join Date: Apr 2006
Location: UK
Posts: 6,566
Re: Question about REW automatic equalization

REW hasn't attempted any correction above 800 Hz because the response lies too far below the target. If you used the HF fall control in the target settings to have some downward slope as frequency increases parts of the response would fall into a range where REW would apply correction, but generally speaking it is not a good idea to apply EQ above a couple of hundred Hz as the effects become too location dependent. There is more on that topic in general in the help. If you did want to apply EQ higher up best using manually applied, broad filters and modest levels to do some tone shaping to taste.
JohnM is offline  
post #9 of 9 Old 05-27-17, 12:05 PM Thread Starter
Shackster
 
Join Date: May 2017
Posts: 12
Re: Question about REW automatic equalization

Thanks!
gorman is offline  
Reply

Bookmarks

Tags
automatic , equalization , question , rew

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome