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Hi
I want to reduce sensitivity of 3ohm tweetor by 4.5-5 db, can anyone suggest me the value of resistor I should put series to the tweetor?
Thanks
Follow Ups:
I also like the variable Fostex unit suggested by Duke (see link). If you are not sure exactly how much to pad the tweeter, its an easy way to find out through experimentation. But they are a little expensive (about $20 each IIRC)
However it is not hard to slap together a temporary L-pad with a bag-o-resistors and some alligator clips. Once you get it dialed in, you can solder it up and install it behind the behind posts.
Simply placing a resistor in series with the tweeter will change the impedance of the load the crossover sees, thus changing the crossover frequency and screwing up any equalization of the tweeter included in the crossover.The solution is called an "L-pad", and doesn't change the impedance seen by your crossover. It uses two resistors - one in series with the driver, and one in parallel. It is placed in the circuit between the crossover and the driver.
As an alternative, you can purchase a continuously-variable L-pad from either Madisound or Parts Express. These come in 8 and 4 ohm versions.
Duke
p.s. - The crossover frequency will shift upwards with an L-pad because you're shelving the tweeter's response downward (in amplitude) so the overlap point shifts upward (in frequency). In practice this shouldn't be a problem.
I'd simply replace the 3 ohm resistor with one of 4.5 or 5 ohms (Mills resistors from Parts Express, $3.50 each). I wouldn't go higher because it would dull the treble.
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