inductance and Q question

kappa546 · 8th March 2006, 08:51 PM

I have a question relating my Ascendant Audio arsenal 12. with my old atlas 12 they recommended different shorting methods to the second coil depending on your application (for low, mid, or high Qts). what could i expect from shorting the second coil on my arsenal? lower inductance im assuming but what happens to the effective Qts (would it be cut in half, root of original, some other formula)? how would different value resistors affect them or would you actually recommend the use of a potentiometer? any suggestions? how would you calculate the Qtc for that sub in a ~1.3cf enclosure. is there a magic number we try and shoot for ever? and could one achieve the desired Qtc with a sub that requires a bigger enclosure in a small box using the potentiometer method? what would you use to measure it then?

lndm · 9th March 2006, 01:30 AM

Vas/(((Qtc/Qts)^2)-1) gives box size. Invert this as required. Qtc=0.5 to 1 is common (horses for courses).

Try googling measure Qt for instructions.

sreten · 9th March 2006, 12:25 PM

http://www.users.bigpond.com/bcollis...onversions.htm

and WinISDPro.

/sreten.

kappa546 · 9th March 2006, 04:28 PM

thanks guys... is there a magic number u shoot for? i'm more interested in the shorting effect

lndm · 9th March 2006, 09:25 PM

I am not familiar with this speaker, but decreasing the Q of the fundamental system resonance (if that's what you are asking about) sounds like a good idea if you feel the bass is too strong/loose. Such as when you need to put the unit close to a corner, or in a small room, or when you need to sit against a wall.

infinia · 10th March 2006, 01:41 PM

Shorting the second voice coil on a DVC driver would act like a electric brake limiting VC movement. You would still get sound much lower levels esp for bass notes. Half power for high notes.
Not sure if this answers your Q.

redunzelizer · 10th March 2006, 05:10 PM

You might want to take a look at the DVC papers from Adire. Some handy explanations & variations:

http://www.adireaudio.com/TechInfo.htm

regards

8th March 2006, 08:51 PM	#1
kappa546 diyAudio Member Join Date: Dec 2004 Location: austin	inductance and Q question I have a question relating my Ascendant Audio arsenal 12. with my old atlas 12 they recommended different shorting methods to the second coil depending on your application (for low, mid, or high Qts). what could i expect from shorting the second coil on my arsenal? lower inductance im assuming but what happens to the effective Qts (would it be cut in half, root of original, some other formula)? how would different value resistors affect them or would you actually recommend the use of a potentiometer? any suggestions? how would you calculate the Qtc for that sub in a ~1.3cf enclosure. is there a magic number we try and shoot for ever? and could one achieve the desired Qtc with a sub that requires a bigger enclosure in a small box using the potentiometer method? what would you use to measure it then?

10th March 2006, 01:41 PM	#6
infinia diyAudio Member Join Date: May 2005 Location: Californication	Shorting the second voice coil on a DVC driver would act like a electric brake limiting VC movement. You would still get sound much lower levels esp for bass notes. Half power for high notes. Not sure if this answers your Q. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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9th March 2006, 01:30 AM	#2
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	Vas/(((Qtc/Qts)^2)-1) gives box size. Invert this as required. Qtc=0.5 to 1 is common (horses for courses). Try googling measure Qt for instructions.

9th March 2006, 12:25 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	http://www.users.bigpond.com/bcollis...onversions.htm and WinISDPro. /sreten.

9th March 2006, 04:28 PM	#4
kappa546 diyAudio Member Join Date: Dec 2004 Location: austin	thanks guys... is there a magic number u shoot for? i'm more interested in the shorting effect

9th March 2006, 09:25 PM	#5
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	I am not familiar with this speaker, but decreasing the Q of the fundamental system resonance (if that's what you are asking about) sounds like a good idea if you feel the bass is too strong/loose. Such as when you need to put the unit close to a corner, or in a small room, or when you need to sit against a wall.

10th March 2006, 05:10 PM	#7
redunzelizer diyAudio Member Join Date: Jan 2006 Location: on the move	You might want to take a look at the DVC papers from Adire. Some handy explanations & variations: http://www.adireaudio.com/TechInfo.htm regards

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