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In Reply to: RE: Tweeter update posted by Tadlo on December 16, 2011 at 07:26:44
If you need 2 dB and don't want to change the crossover frequency, consider using a 2 resistor L-pad. 2 ohms in series, and 20 ohms in parallel with the tweeter will give about 2 dB of attenuation, and keep the impedance more or less constant. Just be sure the parallel resistor is closest to the tweeter, so the 2 ohm is in series with both tweeter and 20 ohm.
Jerry
Follow Ups:
Thanks, I think I get it now. I don't have to buy an L-Pad do I? I just get two resistors--a 2 ohm and a 20 ohm--and connect them to the wires to the tweeter in the way you described--right?
Nope, just a couple of resistors. Nice part is that you can hang it all on the back of the tweeter, so you don't need to open the cabinet or trace out the crossover. By the way, it's called an L-pad because the two resistors form an L. There are also T pads; but you don't need one of those.
The rotary control we call an L-pad is really a variable L-pad and as you rotate the shaft, it changes the series and parallel resistance to maintain a constant input impedance.
Jerry
OK, thanks, Jerry, now I get it.
Thanks a lot, but is there an easier way? Couldn't I just put a single resistor of the right value on one of the wires between the crossover and the tweeter. Please take into account that I know very little about electronics.
One resistor will work, but it will shift the crossover frequency a little lower. Two resistor pad will keep the same impedance, same frequency.
Thanks. Do you know how much lower or how I can calculate how much?
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