Delay - echo through BL and FL horns

jamikl · 1st April 2006, 07:36 AM

Still trying to sort out whether to build some other type of cabinet or horns. My understanding through older literature is that if the horn path differnence through say a low and a mid leads to a delay of over two milliseconds between the two then it is hearable, I don't know if this only applies to large halls or would be detectable in average living rooms. Does anybody have any experience to clarify this?
Looking forward to any replies.
jamikl

paulspencer · 2nd April 2006, 05:40 AM

2ms in the bass range is trivial!

All speakers will have group delay which is effectively a delay with respect to frequency. What is audible depends very much on frequency but 2ms in a BLH is nothing to worry about.

lndm · 2nd April 2006, 06:35 AM

You might think it makes a difference, you could sit and calculate that it would, you could read about it, but amazingly when done well, a BLH sounds great.

More effort should be put toward rolling off the horn to avoid mid nulls, and room integration IMO.

jamikl · 3rd April 2006, 03:41 AM

Thanks for the replies paulspencer and Indm. I agree Indm. They can sound very good indeed. It was easier before we had the simulations I think. I have done several on BLHs that I know sound good but the sims never look good!!!! Makes me wonder if we are barking up the wrong tree as to what contributes to good sound. Must be a lot more yet to be understood!
jamikl

lndm · 3rd April 2006, 06:52 AM

A lot more to be learned indeed (or did we always know it?).

I recently lead lined my cabinets only to find I miss the vibrations! The sound is more accurate but more, ummm, boring

I know it will be better in the end though, I'll just have to wade through my coupling cap and valve collection first. Where does it end?

1st April 2006, 07:36 AM	#1
jamikl diyAudio Member Join Date: May 2005 Location: Melbourne	Delay - echo through BL and FL horns Still trying to sort out whether to build some other type of cabinet or horns. My understanding through older literature is that if the horn path differnence through say a low and a mid leads to a delay of over two milliseconds between the two then it is hearable, I don't know if this only applies to large halls or would be detectable in average living rooms. Does anybody have any experience to clarify this? Looking forward to any replies. jamikl

2nd April 2006, 05:40 AM	#2
paulspencer diyAudio Member Join Date: Sep 2003 Location: Melbourne, Australia	2ms in the bass range is trivial! All speakers will have group delay which is effectively a delay with respect to frequency. What is audible depends very much on frequency but 2ms in a BLH is nothing to worry about. __________________ AUDIO BLOG \| Bass integration guide My work: www.redspade.com.au web design studio

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2nd April 2006, 06:35 AM	#3
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	You might think it makes a difference, you could sit and calculate that it would, you could read about it, but amazingly when done well, a BLH sounds great. More effort should be put toward rolling off the horn to avoid mid nulls, and room integration IMO.

3rd April 2006, 03:41 AM	#4
jamikl diyAudio Member Join Date: May 2005 Location: Melbourne	Thanks for the replies paulspencer and Indm. I agree Indm. They can sound very good indeed. It was easier before we had the simulations I think. I have done several on BLHs that I know sound good but the sims never look good!!!! Makes me wonder if we are barking up the wrong tree as to what contributes to good sound. Must be a lot more yet to be understood! jamikl

3rd April 2006, 06:52 AM	#5
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	A lot more to be learned indeed (or did we always know it?). I recently lead lined my cabinets only to find I miss the vibrations! The sound is more accurate but more, ummm, boring I know it will be better in the end though, I'll just have to wade through my coupling cap and valve collection first. Where does it end?

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