I am trying to design a baffle step compensation network for the woofers in my system. The calculations require the speaker Re, the DC resistance of the speaker voice coil. The published specs say this value is 6.7 ohms. My multimeter, with zeroed leads resistance, says the value is 6 .7 ohms. But my Dayton Audio DATS3 gave me a value of 8.98 ohms. They can't both be right, and using the different Re for the calculations gives me different values for the resistance and inductance of the circuit and for a zobel circuit across the woofer. Why am I getting different numbers, and which Re should I use?
If you don’t mind my curiosity, why does one need Re for a baffle step correction, apart from the situation one is simulating the bespoke drive unit? In that case one would need to know Le, Cm, Lm and Rm (at least) too.
The best way to do baffle step compensation is with the crossover and not with some cookbook formula. You are way better off using measurements and a crossover simulator like vituixcad with an optimixer to fit your measured woofer response to a target to automatically get your baffle step, usually with fewer parts.
For markbakk - The assumption is that the OP wants to do a parallel L-R filter between the crossover and amp using textbook / cookbook formulas. In practice these cookbook formulas give you an answer that may make you feel confident, but it isn't likely to give you good results.
For markbakk - The assumption is that the OP wants to do a parallel L-R filter between the crossover and amp using textbook / cookbook formulas. In practice these cookbook formulas give you an answer that may make you feel confident, but it isn't likely to give you good results.
You mean impedance of course. But one can’t calculate a text book baffle step correction without extensive simulation of the sound field in a certain space around a certain loudspeaker enclosure. It’s next to pointless.
@eriksquires. I agree. What good does it do you if the network is optimized for close to calculated theoretically optimum conditions when the speaker will be used in a specifically flawed environment.
The range between 300 and 1k is critical to get right if you want a somewhat accurate sounding speaker.
The range between 300 and 1k is critical to get right if you want a somewhat accurate sounding speaker.