It is currently Sun Mar 26, 2017 5:47 pm

All times are UTC-05:00




Post new topic  Reply to topic  [ 48 posts ]  Go to page Previous 1 2 3 4
Author Message
PostPosted: Sun Feb 26, 2017 4:54 pm 
Offline

Joined: Sun Sep 25, 2016 6:21 pm
Posts: 63
I am glad you are entertained, I am learning a lot, I admit that I hate just being told to trust the design I like to hear the how and why too, I appreciate the support and input of everyone who comments. Thank you all!!!

I do have a question I would like to pose that I am interested to see what I get back. I believe that as I mess with my driverack the crossover in particular I believe that adjusting the filter order or slope of one filter that the phase alligmnet changes! I find my self having to change polarity often after adjusting the filter slope or order in order to get the drivers back in coincidence. Am I crazy or is this a thing? Thank you guys in advance! :noob:


Top
   
PostPosted: Sun Feb 26, 2017 6:28 pm 
Offline

Joined: Mon Nov 28, 2011 11:12 am
Posts: 5417
Location: Ilfracombe Queensland Australia
ACUA wrote:
I am glad you are entertained, I am learning a lot, I admit that I hate just being told to trust the design I like to hear the how and why too, I appreciate the support and input of everyone who comments. Thank you all!!!

I do have a question I would like to pose that I am interested to see what I get back. I believe that as I mess with my driverack the crossover in particular I believe that adjusting the filter order or slope of one filter that the phase alligmnet changes! I find my self having to change polarity often after adjusting the filter slope or order in order to get the drivers back in coincidence. Am I crazy or is this a thing? Thank you guys in advance! :noob:


Regarding your driverack and changing settings:
What you are experiencing is no surprise.
Phase is frequency dependant.
So when you change the frequency of the crossover point, you should expect a change in phase, leading to the correction you have noticed.
Then add in altering slope (and slope type). Since slopes are X dB/octave, they affect phase in the frequencies around the crossover point as well.

It's beyond most of us as small time operators to afford (or justify buying) the measuring equipment to test phase.
That's why, the best advice usually seen here, and the simplest thing to do, is to make sure the subs and tops/mains are in phase at the crossover point, every time you setup.
If you have phase altering capability in your DSP, then you can see if either the subs or tops are out of phase with each other at the crossover point by phase shifting by 180 degrees, and if it was out of phase, it will now get louder at the crossover frequency.
You can also make up a phase test speaker lead (it should be marked as that btw), with one plug on the lead having polarity swapped to do the same thing...

_________________
Built:
2 x DR 250 (melded array) with March 2012 plans.
4 x 20" BP102 T39's
3 x WH8 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...


Top
   
PostPosted: Sun Feb 26, 2017 9:14 pm 
Offline

Joined: Wed Mar 25, 2009 7:07 pm
Posts: 1158
Location: Medicine Hat, Alberta, Canada
ACUA wrote:
I believe that adjusting the filter order or slope of one filter that the phase alligmnet changes! I find my self having to change polarity often after adjusting the filter slope or order in order to get the drivers back in coincidence. Am I crazy or is this a thing? Thank you guys in advance! :noob:


That is a thing. Crossovers affect the phase and different types and slopes all change the phase differently. If one alignment doesn't sound right then switching to another can have a huge difference as sometimes even if you align the phase together between the tops and subs at 100 hz, they may still cancel slightly higher or lower, say 150hz or 75hz as phase varies with frequency. EQ also changes the phase so after a tuning session you may also want to check your alignment.

_________________
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 48 posts ]  Go to page Previous 1 2 3 4

All times are UTC-05:00


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
banner
Powered by phpBB® Forum Software © phpBB Limited