radiogram Posted October 29, 2010 Share Posted October 29, 2010 Al: Subsequent to your finding of the actual complex K33 woofer impedence to be about 6+1j, you have mentioned that you actually subtract the 1mH Le from the required inductor value for the woofer section (instead of using a zobel) and thus you also now recommend 1.3mH for the universals instead of 2.3mH. However, when I downloaded your AP12 desing form your website, the inductor values shown for various Xover frequencies do not seem to have subtracted out the woofer Le. Could you please clarify this? Thanks Quote Link to comment Share on other sites More sharing options...
radiogram Posted October 29, 2010 Author Share Posted October 29, 2010 Al: Just realized that that AP12 woofer section is an even (second) order one. I guess had it been an odd order one you could have subtracted the Le from the last inductor if its value were >= Le, but cannot in this case even order case. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted October 29, 2010 Share Posted October 29, 2010 The AP12 series are computer optimized combination of a 3rd order lowpass and a second order highpass. The output inductor of the lowpass is 1 mHy in all the designs. It is simply left out when I build them. Since the 1 mHy woofer voice coil does not function as a part of the attenuation slope, the filter acts like a 2nd order. I call the entire networks 2nd order for that reason. That's the reason for the sereis name "AP12". That stands for "All-Pole 12 db / octave". The computer model of the AP12-500 is below. Note the 1 mHy inductor at the output. It's also assumed to be infinite Q with the load simulating the woofer resistive component. Al K. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.