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how much spl does the 10 ohm resistor knock off ? like 2 db ? Thanks!!!
There is no 10Ω resistor in the one π loudspeaker. There is a 16Ω resistor, but it's in parallel with the tweeter so it doesn't attenuate it. The shunt resistor provides a little bit extra damping, and works sort of like a Zobel. The tweeter has a 12Ω impedance peak at 650Hz and this resistor reduces that peak. Without it, more low frequency energy than wanted would be developed across the tweeter.
OK ,its a 16 ohm thats what the diagram said but it had a 5 uf. capacitor and we are supposed to use a 10uf ,is that correct? Thanks.
The crossover capacitor used in the one π and two π loudspeakers is 10uF, that's right. I made a prototype with a different tweeter having 8Ω average impedance, and I think I may have inadvertently sent that schematic out for a while. If you got the wrong schematic, I apologize. The crossover for the DX25 has a series 10uF capacitor followed by a 16Ω shunt resistor.