Advice on crossover frequency and slope - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 2nd October 2011, 05:09 AM   #1
spot is offline spot  Australia
diyAudio Member
 
Join Date: Sep 2011
Default Advice on crossover frequency and slope

Hi,
Im building an active sub to go with a pair of small 2-way speakers (yet to be designed also).
For the whole system I would like to put the sub crossover frequency as high as possible to minimise the excursion on the 2-ways, yet low enough so that all the sounds appear to come from the 2-ways.
What is the highest frequency that can be used here, and what slope of crossover is required?
I have seen some say 80Hz and 100Hz, is it possible to go higher without directionality being a problem?
Thanks
  Reply With Quote
Old 2nd October 2011, 12:00 PM   #2
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
[QUOTE=spot;2731697]
Quote:
..Hi, Im building an active sub to go with a pair of small 2-way speakers (yet to be designed also).
For the whole system I would like to put the sub crossover frequency as high as possible to minimise the excursion on the 2-ways, yet low enough so that all the sounds appear to come from the 2-ways..
Hi,

I wouldn't exceed ~150 Hz/LR24LPF and for best symmetry use 2 floor located subs placed at the outsides of the main speakers(or below) or if only one sub: placed centrally.

Quote:
..What is the highest frequency that can be used here, and what slope of crossover is required?
I have seen some say 80Hz and 100Hz, is it possible to go higher without directionality being a problem?
Thanks..
See the picture (lower half) for hints (Room size<150m^3):

b
Attached Images
File Type: jpg Gldy-extrapolation_Vertical Localisation-of-Woofers.JPG (504.2 KB, 101 views)
  Reply With Quote
Old 2nd October 2011, 12:09 PM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
I agree wholeheartedly with Bj.
As an experiment I built up a woofer and placed it off to the right of my rightmost main satellite.
The satellites were rolled off at 80Hz and the woofer was rolled of at 150Hz. (yes, there was an octave of overlap)
I could not tell that the bass was coming from the right. The audio image was consistently fixed by the pair of satellites.

Bj,
would you be prepared to explain how to read your example data?
__________________
regards Andrew T.

Last edited by AndrewT; 2nd October 2011 at 12:11 PM.
  Reply With Quote
Old 4th October 2011, 02:43 PM   #4
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Quote:
Originally Posted by AndrewT View Post
..Bj,
would you be prepared to explain how to read your example data?
Hi Andrew,

Sorry for being late and obviously forgot to answer your question..What do you have in mind?

b
  Reply With Quote
Old 4th October 2011, 11:10 PM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
I have a fair bit of background knowledge of speakers and speaker design, but this delay is taking to and beyond my limits.
Starting from the top. What is the data telling us and what bits do we need to read to get the message the data contains?
__________________
regards Andrew T.
  Reply With Quote
Old 5th October 2011, 03:14 AM   #6
diyAudio Member
 
Join Date: Aug 2007
When I put a Sub with my ML CLSs I was surprised at how high I had to put the cross over to get a nice smooth response through the transition range.

The CLSs would go down to 60-odd Hz, but (after lots of experimentation) I ended up using 115Hz as the XO frequency. This kept most of the bass off the electrostatic pannels and cleaned up the intermodulationals while not driving the 15" Sub (Velodyne DD15) up above its useful frequency range. The DD-15 would start to crackle it it tried to drive signals up in the 200+Hz range.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
What's your favorite crossover slope? JoeBob Multi-Way 19 4th October 2004 11:10 PM
Crossover slope? Mantronic Multi-Way 0 30th July 2003 01:47 PM
Crossover slope interaction ?s toenail Multi-Way 0 1st May 2003 01:06 AM
Infinite Slope Crossover thylantyr Solid State 15 21st September 2002 12:36 AM


New To Site? Need Help?

All times are GMT. The time now is 03:29 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2