Why is Q balance required

goldyrathore · 16th May 2004, 12:36 PM

Hi,

I saw some of the impedance curves of woofers at PE site. None have the irrgularities in impedance curve. So what is Q-balanace all about ( http://www.lithosindia.com/qbalance.htm )? What does it correct? How is it that it corrects more than it alters. I thought the less the components in the crossover the better it is. But Q-balance deliberately introduces components. AVMAX had carried a review of a Lithos' product with Q-Balance and they said it really sounded good.
Can somebody throw some more light on the matter.

Thanks in advance.
Goldy

Timn8ter · 16th May 2004, 02:08 PM

I'm no expert but it sounds like a notch filter except for the "not in the direct signal path of the speaker" part. There's only two ways I know to modify FR and that's electrical or mechanical. If it's not in the signal path (electrical) then it must be mechanical which could include tweaking the cabinet or tweaking the driver. Am I wrong?

kelticwizard · 16th May 2004, 02:25 PM

Maybe it comes with a small preamp unit which modifies the signal before it hits the power amp.

I understand KEF had a unit something like that once, though not to correct peaks and dips.

sreten · 16th May 2004, 03:28 PM

"Q-balance" is nothing but unscientific mumbo - jumbo for some
basic impedance compensation as far as I can tell - hardly new.

"not in the signal path" usually means in parallel in these cases.

sreten.

Bill Fitzpatrick · 16th May 2004, 03:33 PM

I'd say it's a combination of techniques related to driver selection, driver mounting, crossover design and enclosure design. Some of the more advanced of we DIYers make the same efforts.

Nelson Pass · 16th May 2004, 10:26 PM

A number of people, mostly manufacturers, attempt to use
the phrase "not in the signal path" to mean "not in series
with the signal path", thus they might employ a "Zobel"
network in parallel.

Timn8ter · 17th May 2004, 12:04 AM

That's the impression I got reading through this too. Many of the "advances" they mention related to their designs are techniques that have been used for a very long time but they try to make it sound new and exclusive.

16th May 2004, 12:36 PM	#1
goldyrathore diyAudio Member Join Date: Nov 2002 Location: Bangalore, India	Why is Q balance required Hi, I saw some of the impedance curves of woofers at PE site. None have the irrgularities in impedance curve. So what is Q-balanace all about ( http://www.lithosindia.com/qbalance.htm )? What does it correct? How is it that it corrects more than it alters. I thought the less the components in the crossover the better it is. But Q-balance deliberately introduces components. AVMAX had carried a review of a Lithos' product with Q-Balance and they said it really sounded good. Can somebody throw some more light on the matter. Thanks in advance. Goldy __________________ Audio enthusiast/hobbyist

16th May 2004, 02:25 PM	#3
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	Maybe it comes with a small preamp unit which modifies the signal before it hits the power amp. I understand KEF had a unit something like that once, though not to correct peaks and dips. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

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16th May 2004, 02:08 PM	#2
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	I'm no expert but it sounds like a notch filter except for the "not in the direct signal path of the speaker" part. There's only two ways I know to modify FR and that's electrical or mechanical. If it's not in the signal path (electrical) then it must be mechanical which could include tweaking the cabinet or tweaking the driver. Am I wrong?

16th May 2004, 03:28 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	"Q-balance" is nothing but unscientific mumbo - jumbo for some basic impedance compensation as far as I can tell - hardly new. "not in the signal path" usually means in parallel in these cases. sreten.

16th May 2004, 03:33 PM	#5
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	I'd say it's a combination of techniques related to driver selection, driver mounting, crossover design and enclosure design. Some of the more advanced of we DIYers make the same efforts.

16th May 2004, 10:26 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	A number of people, mostly manufacturers, attempt to use the phrase "not in the signal path" to mean "not in series with the signal path", thus they might employ a "Zobel" network in parallel.

17th May 2004, 12:04 AM	#7
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	That's the impression I got reading through this too. Many of the "advances" they mention related to their designs are techniques that have been used for a very long time but they try to make it sound new and exclusive.

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