Advice on crossover frequency and slope

spot · 2nd October 2011, 05:09 AM

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

bjorno · 2nd October 2011, 12:00 PM

[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

AndrewT · 12:11 PM

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?

bjorno · 4th October 2011, 02:43 PM

Quote:

Originally Posted by AndrewT

..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

AndrewT · 4th October 2011, 11:10 PM

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?

Mitch Alsup · 5th October 2011, 03:14 AM

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.

2nd October 2011, 05:09 AM	#1
spot diyAudio Member Join Date: Sep 2011	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

2nd October 2011, 12:09 PM	#3
AndrewT 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? Last edited by AndrewT; 2nd October 2011 at 12:11 PM.

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4th October 2011, 11:10 PM	#5
AndrewT 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?

5th October 2011, 03:14 AM	#6
Mitch Alsup 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.