L-Pad Question

Soulwax · 10th December 2004, 04:07 PM

If I use a series L-pad before the LF coil to attenuate the output of a woofer (such that the L-Pad is wired externally between the bi-wire terminals of my loudspeakers) will the impedance of the L-Pad be summed with that of the coil and alter the LF crossover frequency in anyway?

Bill Fitzpatrick · 10th December 2004, 04:57 PM

Yes. If you have to have an L Pad on a woofer it should go after the coil and even then it will affect the crossover to some degree. Using a pad to reduce the input to a woofer is a bad idea anyway. You're likely to burn up the pad and it will change the Q of the woofer.

Soulwax · 11th December 2004, 10:07 PM

Cheers Bill.

My speakers have an essentially dull balance and I’m looking to add a little more HF sparkle. Would removing the tweeter damping resistor (4.7ohm wired in series before the cap) be a better way to proceed? My speakers are rated at a nominal 8 ohms with minimum impedance around 4.5ohms.

Bill Fitzpatrick · 11th December 2004, 10:45 PM

Yes, remove the tweeter resistor and increase the cap value by about 30%.

morbo · 12th December 2004, 05:31 AM

I usually only see L-pads on tweeters. Is it possible and/or adivsable to use an L-pad on a widerange driver crossed to a woofer at say, 500hz?

Bill Fitzpatrick · 12th December 2004, 06:45 AM

Sure

10th December 2004, 04:07 PM	#1
Soulwax diyAudio Member Join Date: Dec 2004 Location: .........	L-Pad Question If I use a series L-pad before the LF coil to attenuate the output of a woofer (such that the L-Pad is wired externally between the bi-wire terminals of my loudspeakers) will the impedance of the L-Pad be summed with that of the coil and alter the LF crossover frequency in anyway?

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10th December 2004, 04:57 PM	#2
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Yes. If you have to have an L Pad on a woofer it should go after the coil and even then it will affect the crossover to some degree. Using a pad to reduce the input to a woofer is a bad idea anyway. You're likely to burn up the pad and it will change the Q of the woofer.

11th December 2004, 10:07 PM	#3
Soulwax diyAudio Member Join Date: Dec 2004 Location: .........	Cheers Bill. My speakers have an essentially dull balance and I’m looking to add a little more HF sparkle. Would removing the tweeter damping resistor (4.7ohm wired in series before the cap) be a better way to proceed? My speakers are rated at a nominal 8 ohms with minimum impedance around 4.5ohms.

11th December 2004, 10:45 PM	#4
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Yes, remove the tweeter resistor and increase the cap value by about 30%.

12th December 2004, 05:31 AM	#5
morbo diyAudio Member Join Date: Sep 2004 Location: Guelph, Ontario	I usually only see L-pads on tweeters. Is it possible and/or adivsable to use an L-pad on a widerange driver crossed to a woofer at say, 500hz?

12th December 2004, 06:45 AM	#6
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Sure

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