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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Inductor values - how close must they be? posted by Jon Risch on October 28, 2003 at 19:09:27:
Hi John.
First, I want to thank you for your time and response - I always appreciate your helpful answers - you da' man!
Regarding this present deal, unfortunately, I have no specs for the drivers I'm using, other than the DCR of the drivers - woofer (a PSB 6.5") is 3.6 ohms, tweeter (custom-built/designed Vifa silk 1") is 6 ohms.
I chose the 3K crossover point because that was the original crossover point in this cabinet, before replacing the PSB tweeter (Vifa TD type) with the new Vifa silks.
The guy who sold me the custom Vifa tweets said to use 2nd-order Linkwitz-Riley type X-over, which I did for both the HPF and LPF (assuming that's what he meant.) (He also gave no indication of a good X-over point for this tweeter, other than saying it was safe to go as low as 1Khz.)
What I subsequently heard was a "loss" in the lower midrange, and am assuming this is probably because of the steeper rolloff of the 2nd order L-R LPF. (As a side note, the tweeter sounds fantastic!!)
I realize now one of my mistakes wasn't examining the original X-over, which had just an (iron-core) inductor for the woofer, indicating 1st-order Buttorworth LPF. Thus, my reason for getting the Goertz Foil inductor and using that for the LPF.
Having presented all that, my questions now are:
Is it (sonically) OK to mix a Buttorworth filter with a Linkwitz-Riley filter in a X-over?
And, would it be sonically worth my while to rebuild the HPF as a 2nd order Buttorworth, crossing over at the 2600Hz point of that .22mH LPF inductor?
Thanks again for your input and great help. (I'll also post this at Madisound...)
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Follow Ups
- Thanks, JR, but - more X-over questions... - JTMusic 11:10:17 10/29/03 (0)