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Old 26th May 2008, 02:31 AM   #1
bastek is offline bastek  United States
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Default Attenuate tweeter level by 2 db

I need to lower the highs by 1.5-2db without altering the crossover phase. I can use a 3R in series with the 13R, or a 25R in parallel with the tweeter. What's the best way to do it?
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Old 26th May 2008, 08:38 AM   #2
DAMIC is offline DAMIC  Seychelles
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Hi,

http://www.carstereo.com/help/Articles.cfm?id=18
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Old 26th May 2008, 05:39 PM   #3
bastek is offline bastek  United States
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Thanks for the link, but i can't use the L-pad formula. I can only add one resistor in series or in parallel. What's the correct value for 2 db attenuation? The tweeter impedance is 7 ohms.
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Old 26th May 2008, 11:05 PM   #4
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Quote:
Originally posted by bastek
Thanks for the link, but i can't use the L-pad formula. I can only add one resistor in series or in parallel. What's the correct value for 2 db attenuation? The tweeter impedance is 7 ohms.
Why is that? What you are looking for, maybe is this.
http://www.troester.org/ls/lpad.html

But the model should be tested. You want to use your xover or similar (same results) with a different attenuation, if I'm right. If you need help just ask. What is your tweeter (besides the 7 thing)?
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Old 27th May 2008, 12:21 AM   #5
bastek is offline bastek  United States
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Hi. My tweeter is the Fountek NeoCD3.0 and the speaker is a little bright. That's why i want to bring the level down a bit 1-2 db will do it).
I want to use an external switch for original or -2 db setting.
thanks
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Old 27th May 2008, 03:08 AM   #6
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The 25 Ohm in parallel with the tweeter gives you the most even attenuation across the passband and keeps the phase closer to the original schematic.

regards,

Dennis
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Old 27th May 2008, 01:27 PM   #7
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Quote:
Originally posted by djarchow
The 25 Ohm in parallel with the tweeter gives you the most even attenuation across the passband and keeps the phase closer to the original schematic.

regards,

Dennis
Dennis, that gives a good attenuation of ~2dB.

bastek, I wouldn't be amazed if you find kind of a peak at ~15k of 6dB with this tweeter/xover, unless you have a fullrange kind of driver or a first order midwoofer with low roll-off + good integration. (Cons. xover at ~2K5 for the NeoCD).
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Old 27th May 2008, 10:05 PM   #8
bastek is offline bastek  United States
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I connected a 20ohm in series with the external switch, in parallel to tweeter, and they sound smoother in my larger room. I don't hear any peaks or dips in the highs, but i have to do some measurements. very satisfied with the sound for now. Thanks.
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Old 27th May 2008, 10:08 PM   #9
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Good. They also have a ~10dB attenuation/dumped (from 95) 8dB@5K/4.5dB@15K before the || resistor, so that might get smoothed (a little/bit).
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