Tweeter damping?

graks · 19th April 2005, 11:38 AM

I have a pair of Seas Thor speakers, i think the tweeters are too bright/loud. Any suggestions on how to modify the crossovers? Http://www.seas.no/thor

ocool_15 · 28th May 2005, 06:26 AM

link not working. perhaps a L-pad for the tweeter?

Paul W · 28th May 2005, 02:11 PM

Another thing you might try is a parallel LR circuit inserted in series with one of the lines between the amp and speaker. This will "tilt" overall system response and help preserve the relationships within what is probably a very well designed crossover.

You can determine starting values with simulation software. If you don't have software, start with a low value, low DCR, air core inductor paralleled by a low value high quality resistor. Higher values of L will start the tilt lower in frequency, higher values of R will increase treble attenuation...so you can adjust the values to get the result you want. Just insert the parallel LR combo in one of the lines running to the speaker.

Vigier · 28th May 2005, 03:01 PM

Hi,

there's a 2,2 Ohm resistor directly in series with your tweeter.
For 1 db lower SPL replace it with a 3.3 Ohm and for a 2 db lower SPL replace it with a 4.7 Ohm resistor.
Make sure you use at least a Metal-Oxid (MOX) resistor, definitely NOT a wire-wound.

Grtz, Joris

RJ · 28th May 2005, 03:13 PM

I think what Paul W is trying to explain is baffle step correction.
Try .1 mh inductor in parallel with a 4 ohm resistor.

Paul W · 28th May 2005, 06:40 PM

RJ...Same circuit as baffle step compensation but broader range, more subtle, and acting on the full system rather than just the woofers (to avoid munging relative phase response within Thors crossover...which is probably good without modification). I am guessing around .2 mh and 1 ohm or so...but you could be right, my values are just a guess without sims.

19th April 2005, 11:38 AM	#1
graks diyAudio Member Join Date: May 2004 Location: karasjok	Tweeter damping? I have a pair of Seas Thor speakers, i think the tweeters are too bright/loud. Any suggestions on how to modify the crossovers? Http://www.seas.no/thor

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28th May 2005, 06:26 AM	#2
ocool_15 diyAudio Member Join Date: Nov 2004 Location: sk	link not working. perhaps a L-pad for the tweeter?

28th May 2005, 02:11 PM	#3
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	Another thing you might try is a parallel LR circuit inserted in series with one of the lines between the amp and speaker. This will "tilt" overall system response and help preserve the relationships within what is probably a very well designed crossover. You can determine starting values with simulation software. If you don't have software, start with a low value, low DCR, air core inductor paralleled by a low value high quality resistor. Higher values of L will start the tilt lower in frequency, higher values of R will increase treble attenuation...so you can adjust the values to get the result you want. Just insert the parallel LR combo in one of the lines running to the speaker.

28th May 2005, 03:01 PM	#4
Vigier diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi, there's a 2,2 Ohm resistor directly in series with your tweeter. For 1 db lower SPL replace it with a 3.3 Ohm and for a 2 db lower SPL replace it with a 4.7 Ohm resistor. Make sure you use at least a Metal-Oxid (MOX) resistor, definitely NOT a wire-wound. Grtz, Joris

28th May 2005, 03:13 PM	#5
RJ diyAudio Member Join Date: Oct 2004	I think what Paul W is trying to explain is baffle step correction. Try .1 mh inductor in parallel with a 4 ohm resistor.

28th May 2005, 06:40 PM	#6
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	RJ...Same circuit as baffle step compensation but broader range, more subtle, and acting on the full system rather than just the woofers (to avoid munging relative phase response within Thors crossover...which is probably good without modification). I am guessing around .2 mh and 1 ohm or so...but you could be right, my values are just a guess without sims.

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