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In Reply to: RE: The Power of Suggestion posted by Satie on September 09, 2014 at 10:10:12
I asked for module to be provided as per Magnepan's suggestions which appear in the Tympani IV-A Instruction Manual.
Not in the least being a techie, that information is like a foreign language to me. The manual states to set your electronic crossover in the following way, "Low Pass: -3dB at 250 Hz at 18db per octave (Butterworth) High Pass: -3dB at 400 Hz at 12dB per octave". Mr. Marchand appeared to be familiar with my needs and speaker, so I was happy being able to leave it all up to him.
If you might be so kind as to add to that, and/or improve upon it in any way or in greater specificity, I'd be very much appreciative. I'd certainly ask Mr. Marchand to put together another module for me, and I'd be most happy to listen to it (even if that module comes out being exactly like the one I already have and am using).
The XO-1 capacitors were kindly selected and installed by Magnepan's service department, after I provided them with the impedance values of the amps I would be using. Once again, I'm too dumb in that area to appreciate anything about the "quality" of the capacitors they have selected to use. Even if I were to purchase better capacitors, I'd have to go back to Magnepan to ask them to solder them in for me. So, I guess I'm kinda stuck.
It's like the car I drive, I wouldn't be found dead appearing at my dealer asking for higher quality parts. Yet I manage to still both listen to music and drive a car. :-)
Follow Ups:
Magnepan's recommendation in the manual is not a faithful reproduction of its stock crossover but a compromise to allow the use of commercial crossovers which were available in the day at 18 db Butterworth or 12 db Butterworth. Butterworth is the inventor of this particular crossover alignment.
Magnepan use a much shallower crossover in their design and that is what you should have had Marchand reproduce. Neolith had spreadsheets on the forum for a while that allowed you to reproduce the original crossover. If you are interested then PM Neoith or ping him on the forum and ask him to calculate the component values to use in Marchand's cards. Davey can do this for you as well. They are normally very generous with their time on these matters.
If you want me to, I can put in the appropriate capacitor for the XO 1 in my own unit and send it to you and you can send yours to me. I would just need to know the value of the capacitor inside your XO 1 so I can order a higher grade replacement for it.
While you would not likely come to your dealer to get higher grade parts for your car, you might take your car to have an aftermarket audio system installed so you can produce those subsonic booms that make your car sound like it is an aircraft carrier, or have your fun roadster turbocharged with an aftermarket kit.
Thanks for your kind assistance, offers and suggestions to improve my system and its passive XO-1. It's a lot to chew on and I fear getting in over my head.
"you might take your car to have an aftermarket audio system installed so you can produce those subsonic booms that make your car sound like it is an aircraft carrier, or have your fun roadster turbocharged with an aftermarket kit."
I wouldn't be doing that mainly because I don't spend a lot of time driving. After all these many years, I suppose I'm still sort of a 'plug in and play' type individual being content with that, (however, not to imply that I'm adverse to improving upon it).
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