I have a set of 4Pis with DE250 and have just ordered a pair of H290C waveguides from you. I understand there is a change in the crossovers. Would you email me the crossover diagram with the changes I should make?
My 4Pis are about 5 years old. I just ordered the H290C horns and already have the DE250. I was just checking my crossover and removed C1 to try it out.
I do not have Rs shunt resister installed and was wondering what wattage it should be?
I also noticed C4 in the woofer circuit was 20uf instead of 10uf. Was this an early version and should it be changed?
Wayne Parham Messages: 18785 Registered: January 2001
Illuminati (33rd Degree)
The change from 20uF to 10uF in position C4 slightly shifts the forward lobe so that it is more centered vertically. When C4 is 20uF, the vertical nulls are located 15° above and 25° below the center of the baffle normal. So the forward lobe is oriented slightly downward. When C4 is 10uF, the forward lobe is centered, with vertical nulls spaced +/-20° above and below the centerline.
The resistor in position Rs should be a 10 watt part. It is required for the H290C waveguide, so please install it when you mount your new waveguides.
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