I have a set or Rockford Fosgate component speakers in my car.
Rockford Fosgate Punch P165-S 6-1/2" component speaker system at Crutchfield.com
The tweeters are mounted in the stock dash location and bouncing of the windshield they are way to loud. I want to build a L-pad to decrease the DB by -3 and -6 and see what one works the best.
They have the cross over build into the mid range woofer. So speaker wire goes from the amp to one set of inputs on the mid range driver and then from the other side of the driver to the tweeter. I assume that both the driver and tweeter are 8ohm and wired so that the amp sees 4 ohms. Ill check this with a DMM before I order parts.
I assume that I need to build the L-pad to the resistance of the speaker 8ohm in this example not to the total resistance of 4ohms that the amp sees?
The other question I have is how close to the resistors have to be to the ohm value that the caculators show. I ran a 8ohm speaker with -3db and it tells me to get a 2.34ohm and 19.39 ohm resistor. Can i just get something close or does that really mess things up? Would a 2ohm and 20ohm work?
Rockford Fosgate Punch P165-S 6-1/2" component speaker system at Crutchfield.com
The tweeters are mounted in the stock dash location and bouncing of the windshield they are way to loud. I want to build a L-pad to decrease the DB by -3 and -6 and see what one works the best.
They have the cross over build into the mid range woofer. So speaker wire goes from the amp to one set of inputs on the mid range driver and then from the other side of the driver to the tweeter. I assume that both the driver and tweeter are 8ohm and wired so that the amp sees 4 ohms. Ill check this with a DMM before I order parts.
I assume that I need to build the L-pad to the resistance of the speaker 8ohm in this example not to the total resistance of 4ohms that the amp sees?
The other question I have is how close to the resistors have to be to the ohm value that the caculators show. I ran a 8ohm speaker with -3db and it tells me to get a 2.34ohm and 19.39 ohm resistor. Can i just get something close or does that really mess things up? Would a 2ohm and 20ohm work?
Have you measured yet? Then you won't need to make assumptions that are wrong.
Although it will change the xo frequency a bit, I would just stick a 3-5W resistor inline with the tweeter (so no L-pad). Start with 1 Ohm, 2 Ohms if they're really bright...
No, the drivers are 4 ohms, look at the "details" tab in the link you posted. The built in crossover is listed as 12dB (2nd order) type, fairly conventional. When you connect two drivers of the same nominal impedance on a divider network (crossover), the total impedance is unchanged because the amp only "sees" each drivers individual impedance for the frequency range that it operates in. So what you have is two 4 ohm drivers in a 4 ohm system. You'll need to calculate the l-pad values for 4 ohms.
Mike
Mike
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