Altec N501-8A Crossover Design Query
Hi,
Anybody knows whether the N501-8A is a first order design? I have added a tweeter JBL 2405 and want do a bandpass for the mid horn so that I can use the 2405 from about 8 khz onwards. I will be tapping the signal from the mid horn terminals, which means the 2405 already has a capacitor in series from the N501.
I'm using a crossover calculator to calculate a 3 way, but noticed the capacitor value also changes for the mid as I vary the crossover freq for the 2405. Does that mean that, besides the inductor, I have to add capacitors in series to change the resultant value (i.e the cap in the N501 + additional cap) to that shown by the calculator.
Thanks.
What drivers are you using for the LF and HF currently?
The Altec 500hz crossover was generally used for the 416/515 LF driver and 802/902 HF driver usually on a 511B sectoral horn.
If you were using something like that, run the HF out normally and you will most likely find that with a 1 ufd cap in series with the UHF driver the level match will be very close. If it needs attenuation, then use a L-pad.
Also, add a 15 to 20 ohm resistor across the 2405 and I doubt you will need the L-pad. All you are doing is adding a little air to the top end!
If you have other design considerations, let us know what you are using and we can see if you have special considerations to be looked at.
Hope this helps!
Ron