Mid-Hi crossover time aligning with REW ? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #11 of 14 Old 03-25-17, 02:36 PM Thread Starter
Shackster
red
 
Join Date: Dec 2009
Posts: 51
Re: Mid-Hi crossover time aligning with REW ?

Yeah, thanks a lot John, step by step is best to me...
I had it set to 'no timing….
I'll repeat when I get to the club…
Best regards

Klaus


Quote:
jtalden wrote: View Post
Klaus,
Main Steps:
> Set REW 'loopback timing'/'Acoustic timing' depending on XLR/USB mic.
> Measure MR driver and TW driver
> Select the TW measurement/impulse chart
> Open the 'controls' panel
> Select 'Estimate IR Delay' Record the delay that is offered (ms).
> Select 'Shift IR' [The TW impulse will shift that amount back to near 0 ms]
> Select the MR measurement/impulse chart. In the 'controls' panel and enter the recorded offset value used for the TW IR into the 't=0 offset(ms):' entry box and select 'Apply'
[The MR IR will shift the same amount as the TW. The relative timing will be unchanged as they were both shifted the same distance.]

REW settings for phase analysis:
> Open the 'overlay/phase' graph panel.
> Set 1/48 octave filtering for both measurements.
> Activate the 'IR Windows' popup.
  • Enter 0.00 into the 'Window Reference Time' box
  • Check 'Add Frequency Dependent Window'
  • Enter '5' into 'Width in cycles' [A greater number often works fine. Using a lower number will start to distort the trace tails.]
  • Select 'Apply Windows to All'

The phase overlay graph now displays the correct relative phase between the MR and TW and should be easily read. If it is not clear then there was an error in this process.

If you shift the MR impulse location to find the offset need for proper phase tracking then it is necessary to again enter 0.00 into the 'Window Reference Time' box and select 'Apply'. Any IR shift requires resetting the 'window reference time' to 0.00 to assure the phase relationship will be correct.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
redmountain is offline  
Sponsored Links
Advertisement
 
post #12 of 14 Old 03-25-17, 02:40 PM Thread Starter
Shackster
red
 
Join Date: Dec 2009
Posts: 51
Re: Mid-Hi crossover time aligning with REW ?

… In the mean time…
Can I convert my 'un-timed' measurements into 'timebased / correlated' ones by setting something somewhere ?
Thanks
Klaus


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
redmountain is offline  
post #13 of 14 Old 03-25-17, 02:58 PM
Elite Shackster
 
Join Date: Jan 2010
Location: GTA, Ontario
Posts: 1,400
Re: Mid-Hi crossover time aligning with REW ?

Quote:
redmountain wrote: View Post
… In the mean time…
Can I convert my 'un-timed' measurements into 'timebased / correlated' ones by setting something somewhere ?
Thanks
Klaus
Not without doing a lot of time-consuming work that also includes making a 3rd measurement of Mids & Hi's playing together ( and then dumping all 3 measurements into a separate passive crossover design program and then doing some manual curve-fitting to estimate an offset.

Taking new ( correlated ) measurements is by far the simplest way forward .

EarlK is offline  
 
post #14 of 14 Old 03-25-17, 03:13 PM Thread Starter
Shackster
red
 
Join Date: Dec 2009
Posts: 51
Re: Mid-Hi crossover time aligning with REW ?

Well then thanks a lot for your help
and best regards

Klaus
redmountain is offline  
Reply

Bookmarks

Tags
aligning , crossover , midhi , rew , time

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










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