L pad placement....

Big_Bill · 18th July 2009, 04:24 PM

Hello gang!

Any suggestions as to the minimal distance (length of jumper wire) one can successfuly use between an L Pad and a Zobel network on the crossover board????

grantnsw · 20th July 2009, 01:44 PM

Hi Bill,
'minimal' distance kinda threw me? at audio frequencies, metres should be ok, as long as there's no induced mains hum.

I'm not entirely sure I understand your question but, it is possible for testing purposes to 'LPpad-down' a driver while walking around your listening room. Lyn Olson described his method in his ME(2) designs, from memory. I lost the link so maybe google it or ask him?

When the best setting is found, you simply measure the Lpad's Rs and Rp then solder in the appropriate series and parallel resistors. Amp -> xo -> lpad -> zobel -> driver ( I think the Zobel has to be physically across the driver terminals). my 1/2 cents worth, experts please chime in,
and correct me if I'm wrong please. Grant

activexp · 20th July 2009, 02:16 PM

I don't fully understand your question but as far as I know there isn't a 'minimal' distance between an L-pad and Zobel network.

sparkless · 21st July 2009, 08:20 AM

>>>( I think the Zobel has to be physically across the driver terminals).<<<

No, not necessary.

http://www.diyaudioandvideo.com/Calc...qual/Help.aspx

Big_Bill · 22nd July 2009, 03:26 AM

By distance (linear inches, Cm, mm, ect..) I mean the minimal length (on the crossover board) of jumper wire between the Zobel circuit and the L-Pad circuit before the circuits begin to interfere (if at all) with each other.

Thanks, Bill.

activexp · 22nd July 2009, 11:27 AM

There shouldn't be any interference between an L-pad and Zobel as they're non inductive, so they can be as close together as you like.

Big_Bill · 22nd July 2009, 03:21 PM

Quote:

Originally posted by activexp
There shouldn't be any interference between an L-pad and Zobel as they're non inductive, so they can be as close together as you like.

Thanks activexp!

18th July 2009, 04:24 PM	#1
Big_Bill diyAudio Member Join Date: May 2009	L pad placement.... Hello gang! Any suggestions as to the minimal distance (length of jumper wire) one can successfuly use between an L Pad and a Zobel network on the crossover board????

22nd July 2009, 03:26 AM	#5
Big_Bill diyAudio Member Join Date: May 2009	Clarification By distance (linear inches, Cm, mm, ect..) I mean the minimal length (on the crossover board) of jumper wire between the Zobel circuit and the L-Pad circuit before the circuits begin to interfere (if at all) with each other. Thanks, Bill.

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20th July 2009, 01:44 PM	#2
grantnsw diyAudio Member Join Date: Aug 2006	Hi Bill, 'minimal' distance kinda threw me? at audio frequencies, metres should be ok, as long as there's no induced mains hum. I'm not entirely sure I understand your question but, it is possible for testing purposes to 'LPpad-down' a driver while walking around your listening room. Lyn Olson described his method in his ME(2) designs, from memory. I lost the link so maybe google it or ask him? When the best setting is found, you simply measure the Lpad's Rs and Rp then solder in the appropriate series and parallel resistors. Amp -> xo -> lpad -> zobel -> driver ( I think the Zobel has to be physically across the driver terminals). my 1/2 cents worth, experts please chime in, and correct me if I'm wrong please. Grant

20th July 2009, 02:16 PM	#3
activexp diyAudio Member Join Date: Jul 2009	I don't fully understand your question but as far as I know there isn't a 'minimal' distance between an L-pad and Zobel network.

21st July 2009, 08:20 AM	#4
sparkless diyAudio Member Join Date: Jul 2009	>>>( I think the Zobel has to be physically across the driver terminals).<<< No, not necessary. http://www.diyaudioandvideo.com/Calc...qual/Help.aspx

22nd July 2009, 11:27 AM	#6
activexp diyAudio Member Join Date: Jul 2009	There shouldn't be any interference between an L-pad and Zobel as they're non inductive, so they can be as close together as you like.