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Dumb Question or Not?

cablephil212

cablephil212

Super Member
OK Guys.

I have some peizo tweeters to use in 2way utility speakers. The woofers run FR. I have a single cap for a x-over before the resistor of the tweeter. I put an 8ohm resistor across the terminals of the tweeter for the load to get the x-over point with a cap.

They are a little too bright. So here's the question:

To pad these down, does it matter if the inline resistor (not the across the terminal one) goes before the cap or after?

Thanks
 
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HTHMAN said:
I would put it after the cap. To maintain the impedance of the tweeter and thus the crossover point, you will need to have the proper resister both in series and across the circuit. An L-pad is a simpler solution. This guide might help

http://reviews.ebay.co.uk/Tweeter-Attenuator-Resistor-Guide?ugid=10000000004030106
Click to expand...
Thought I read somewhere caps are pointless with Peizo tweeters?

Definitely agree with the L-Pad, much more effective and gives you more granular control.
 
I had posed this question about using peizo's in a standard x-over'ed box designs and was told that the resistor across the tweeter ternimal made the x-over "see" an impedance load.

From what you guys are saying, even if I use a L-Pad, should I still use the resistor across to keep the impedance uniform for the x-over or not? Doesn't the L-Pad need to see some sort of load, or does it give the load thru it?
 
I always thought they did need a resistor to dump the excess voltage to when using an Lpad. When I refurbished the crossovers they used resistors on the L pads.
 
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