Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st December 2016, 12:04 PM   #1321
Zonneschimmel is offline Zonneschimmel  Belgium
diyAudio Member
 
Join Date: Apr 2013
Rephase-miniDSP.png

Here is a calculated curve without crossover in rephase and what miniDSP HD makes of it.

Rephase: -14dB@ ~3840Hz
MiniDSP HD: -14dB@ ~7580Hz

Everything seems shifted to a higher octave
  Reply With Quote
Old 1st December 2016, 12:49 PM   #1322
3ll3d00d is offline 3ll3d00d  United Kingdom
diyAudio Member
 
3ll3d00d's Avatar
 
Join Date: Jan 2014
I would think it is because you need a 96kHz sample rate filter, presumably it doesn't do a sample rate conversion for you.
  Reply With Quote
Old 1st December 2016, 01:17 PM   #1323
Zonneschimmel is offline Zonneschimmel  Belgium
diyAudio Member
 
Join Date: Apr 2013
Wow, thanks for the fast reply. I hadn't thought of that wrongly assuming it would be a standard 48KHz sample-rate (the rephase screenshot on the miniDSP website shows 48KHz). With the IIR filters the manual says to use a 96KHz program to build biquads, nothing about sample-rate with FIR filters. But somewhere all the way in the back of the manual there is this:

Audio resolution
24-bit input and output, 96 kHz internal sample rate (depending on plugin)

Doesn't seem like there is any way to change it. 4K taps on 4 channels isn't that much if you have to use 96KHz :-(
  Reply With Quote
Old 3rd December 2016, 02:12 PM   #1324
SwissBear is offline SwissBear  Switzerland
diyAudio Member
 
Join Date: Aug 2016
Hi everyone,

Apologies for cross-posting, but I just made a little promotional effort for REW/rePhase on the occasion of the launch of the new interface between REW and rePhase and I wanted to share it with you
Using REW and rephase to generate amplitude and time domain corrections
  Reply With Quote
Old 3rd December 2016, 02:43 PM   #1325
soundcheck is offline soundcheck  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: DUS
@SwissBear

You claim, you're able to generate filters on "Acourate" level.
Have you compared both results??


Acourate puts a lot of "benefitial" effort into pre-ringing compensation.
How is REW/rePhase coping with that?


##############################
Another topic.

I'm in the process of setting up my measurement chain. I'd need some advice.

I stepped over several issues/questions:

1. All microphones except Earthworks seem to offer just decent frequency responses
They pretty much all need correction.
2. That leads to dedicated calibration efforts
I learned that usually calibration is done at 44.1kHz only.
What has to be done for other samplerates than 44.1?
3. I also read that most (cheap) microphones except Earthworks show some kind
of weird phase behavior. What am I supposed to do with these kind of microphones?
Can rePhase correct the phase of the microphone first? How?

Thx for your patience.
  Reply With Quote
Old 3rd December 2016, 02:58 PM   #1326
SwissBear is offline SwissBear  Switzerland
diyAudio Member
 
Join Date: Aug 2016
Quote:
Originally Posted by soundcheck View Post
@SwissBear

You claim, you're able to generate filters on "Acourate" level.
Have you compared both results??


Acourate puts a lot of "benefitial" effort into pre-ringing compensation.
How is REW/rePhase coping with that?
Hi soundcheck,

Yes, I have a license of Acourate and from my POV, both solutions are on par, as far as end results are concerned.

rePhase is probably more on the DIY type of approach, but if you like digging into things, this is a fantastic tool IMHO.

In order to get clean impulses from rePhase correction, you just need to keep close to the minimal phase, ie use minimal phase amplitude corrections as well as minimal phase filters, and this should work. In case you have difficulties, you can ask Pos who always is very helpful.

Quote:
Originally Posted by soundcheck View Post
Another topic.

I'm in the process of setting up my measurement chain. I'd need some advice.

I stepped over several issues/questions:

1. All microphones except Earthworks seem to offer just decent frequency responses
They pretty much all need correction.
2. That leads to dedicated calibration efforts
I learned that usually calibration is done at 44.1kHz only.
What has to be done for other samplerates than 44.1?
3. I also read that most (cheap) microphones except Earthworks show some kind
of weird phase behavior. What am I supposed to do with these kind of microphones?
Can rePhase correct the phase of the microphone first? How?

Thx for your patience.
As far as I understand, rePhase is not a measurement tool. You will probably get better answers asking on the forum of measurement tools like REW or HOLMImpulse.

But you can use rePhase to generate a calibration file which includes phase information. Here is how to do it: https://translate.google.com/transla...-text=&act=url

Hope this helps.
  Reply With Quote
Old 3rd December 2016, 04:44 PM   #1327
mark100 is online now mark100  United States
diyAudio Member
 
Join Date: Dec 2010
Quote:
Originally Posted by SwissBear View Post
Hi everyone,

Apologies for cross-posting, but I just made a little promotional effort for REW/rePhase on the occasion of the launch of the new interface between REW and rePhase and I wanted to share it with you
Using REW and rephase to generate amplitude and time domain corrections
Thank you SwissBear, nice pictorial walk through.

I kook forward to trying it.

And thank you POS, for the upcoming REW interface as well as the Tools and Bypass buttons in the Para Eq tab....
  Reply With Quote
Old 4th December 2016, 02:24 PM   #1328
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: SW Florida
rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
Quote:
Originally Posted by soundcheck View Post
1. All microphones except Earthworks seem to offer just decent frequency responses
They pretty much all need correction.
2. That leads to dedicated calibration efforts
I learned that usually calibration is done at 44.1kHz only.
What has to be done for other samplerates than 44.1?
3. I also read that most (cheap) microphones except Earthworks show some kind
of weird phase behavior. What am I supposed to do with these kind of microphones?
Can rePhase correct the phase of the microphone first? How?
All this is really outside the scope of this thread and belongs in a thread about speaker measurement.
Just briefly:
  • Sample rate of the calibration does not matter except at the very top end. If the calibration ends at 20K, who cares?
  • No mic is perfectly flat. Changing the angle of even an omnidirectional mic will affect it's top end response. Most of the small mic capsules used are remarkable flat.
  • Phase follows frequency response. The calibration file takes care of that.
Unless you are a manufacturer building drivers for market, the common tools available for DIY use are more than good enough.
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 4th December 2016, 03:09 PM   #1329
mark100 is online now mark100  United States
diyAudio Member
 
Join Date: Dec 2010
Quote:
Originally Posted by mark100 View Post
Thank you SwissBear, nice pictorial walk through.

I kook forward to trying it.

And thank you POS, for the upcoming REW interface as well as the Tools and Bypass buttons in the Para Eq tab....
And John, pls forgive me for forgetting to thank you too
  Reply With Quote
Old 4th December 2016, 03:27 PM   #1330
soundcheck is offline soundcheck  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: DUS
"It's good enough"

"Sample rate does not matter on digital filters"

"Out of scope"


"Phase issues of microphones doesn't really matter"

Perhaps I'm completely off track here:
That's my understanding:
rePhase will also correct the microphone phase issues in conjunction with the other phase issues.
You then measure your correction with the same microphone.
And what will you see?
A perfect response!
But probably not a perfect speaker response.
You'll get a perfect (speaker+microphone) response.


I gave up on DRC in the past because results never turned out to be good enough.
The filter associated losses were always worse then the original.

What brought me back to the subject were statements about inaudible corrections
with Acourate. And of course recent statements that REW + rePhase can compete with
Acourate nowadays.
  Reply With Quote

Reply


rePhase, a loudspeaker phase linearization, EQ and FIR filtering toolHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FIR linear phase plugin for MiniDSP? diyjb01 miniDSP 17 9th June 2016 01:35 PM
FIR filter design tool for Loudspeaker magnitude equalization ttmusic Software Tools 3 24th May 2013 08:30 PM
FIR Filtering experiences Olombo PC Based 8 10th February 2013 03:45 PM
AVX based FIR VST, crossover / EQ / DRC and delay KOON3876 PC Based 97 26th November 2012 07:18 AM
Phase EQ using FIR filters Grasso Multi-Way 2 2nd July 2003 10:37 PM


New To Site? Need Help?

All times are GMT. The time now is 10:43 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki