| attenuating 1197 piezo [message #36029] |
Thu, 18 April 2002 10:11  |
mhammill
Messages: 23
Registered: May 2009
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Chancellor |
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I have a pair of 10" woofers that are only 89db eff and would like to pair them up with some motorola 1197 5x15 horns that go down to about 700hz but I'm not sure how to wire the 20ohm resistor and the exact layout or value for the cap to match the efficientcy and still use the natural lowend rolloff of the horns.I'm guessing I need to attenuate about 3-6db so I will have to try various values.
Can anyone draw me a skeet so I'm sure I get it right? I've never padded down a piezo before.
By the way after testing in my livingroom I was suprized how linear the responce of this driver and horn was from 700-18k! Can't beat it for the price.
I have some 2ft3 goodwill epi 120 boxes with good tweeters but rotten woofers that I got for $8 that will be pefect for this project.
Thank's for you help
Mike H.
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| Attenuating piezo tweeters [message #36030 is a reply to message #36029] |
Thu, 18 April 2002 11:19  |
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Wayne Parham
Messages: 18704
Registered: January 2001
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Illuminati (33rd Degree) |
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Put a capacitor in series with a piezo tweeter to attenuate it. That's all there is to it. As far as the value, I'm not familiar with the 1197, so I can't say for sure. But the KSN 1038 is attenuated a little more than 6dB using a 0.1uF capacitor.Here's a chart:
1.0uF -1dB
0.47uF -2dB
0.33uF -3dB
0.22uF -4dB
0.1uF -7dB
Your tweeter may have different electro-mechanical parameters, and would need different values of capacitors for the same attenuation. You might want to check and find out.
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