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Help me decide which tweeter replacement

scolba said:
i was always under the impression that the resulting phase of a 2nd order effected both the high frequency and low frequency drivers, so wiring each speaker backwards would bring them back to match the phase of the original signal....im still learning too, so this could deffinately be wrong! :D
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:scratch2: Hmm, I've never heard it that way. I just seen reference to reversing the tweeter leads. Too, there is no crossover circuit on the woofers. Does this have any significance here? - Mark
 
errrr.....hmmm.....i dunno. lol! See!!

<-- still a noob! :D

so are you saying that the woofers on these things are running full range, and that there is a hi pass on the tweets? if that were the case, then the wiring on the tweets would already be technically backwards. If there is a 2nd order, then that would create a 180* phase shift, resulting in the need to wire the tweets backwards, right?

although, unless they wanted some cancelation in the common frequencies....then they would be wired normally and be out of phase with the woofer.....

hmm...am i making any sense, or just confusing myself??? lol
 
Yes, the woofer is running full range. The tweeters have a second order high-pass x/o with a "shelf-up" (quoting GordonW) circuit and are wired in-phase with the woofers (which actually would make them out-of-phase I think). I just thought it would be interesting to see what happens when we reverse the tweeter leads as is commonly done with second order x/o's. Why are you messin' with me? It's a simple request. Really, it is. I know I'm just a southern hick from SC, but I have feelings, you know. :lmao: Later. - Mark
 
lol....sorry....im tired, and as you can see...my brain isn't functioning well today. :)

besides...isn't "southern hick" a bit redundent?? LOL! Only messin man!! :banana:
 
In a second-order 3 way cross, its usually the mid thats out of phase. Not usually in a 2-way. But try it anyway, you never know.
 
Well I now have gotten this project to the point of being able to do some listening. I'm pretty pleased with the results :thmbsp: - not blown away, but pretty pleased. The Dayton tweeter is a marked improvement over the stock ones. I used a simple second-order x/o as suggested by GordonW (component values are noted elsewhere in this thread). I feel sure that there is room for improvement on the x/o, but I do not have the equipment or experience to take this further without a lot of trial-and-error, save for padding the tweeter if I determine that it's necessary. I'm still debating on this. As can be seen in the pics, the little "sub-baffle" I made for the tweeter isn't the prettiest thing, but it's functional. All in all, worth the effort IMHO. Upper end detail, imaging, extension, etc., all seem to be significantly improved over the stock design. Now if only I still had that other pair of Advent/2's for a shootout :scratch2: . - Mark
 
Mark, take pride in that you're the frist AKer' to do this at least I've never read of anyone here doing it. Looks like a worth while project. As soon as I get my list of multiple speaker project parts complete I'll order it. Been kinda busy with clean up from Katrina.
 
I can understand that. We've been pretty fortunate since Hugo WRT hurricanes. Hugo hammered us (and we're 100 miles inland :yikes: ), so I know where you are coming from. I can't imagine what the folks on the gulf coast are going through right now, though.

I'll be anxious to here how your Advent mods turn out once you get to it. As nice as the Dayton tweeter is, you might consider Gordon's suggestion for the Seas. I have no experience with the latter, but I would presume that Gordon does, and he usually :naughty: seems to know what he's talking about. - Mark
 
Advent2/ Crossover with new tweeter

MarkAnderson said:
Well, based on Gordon's recommendation for a 2100hz cut-off for the tweeter, this is what I've done:

Info I got from PE's website suggests an impedance of 7.4 ohms at the x/o point so after pluggin these values into an on-line x/o calculator which will calculate L-R, Butterworth, and Bessel alignments (what, really, is the difference here?), I went with the Butterworth alignment simply because this one results in the least expensive components :D . The suggested component values are .79mH for the coil and 7.24uF for the cap. I wound up ordering a .8mH coil and a 6.8uF cap since these were the closest values I was willing to pay for. I figure I can add a second cap to get closer, if need be. Now I'm just waiting for the UPS man to deliver. - Mark
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I have installed new tweeters in my Advent/2Ws. Vifa D26NC tweeters. Now considering new crossovers. According to Zaphs the tweeters have very low harmonic distortion above 2500 Hz. I am not technically proficient and am stumbling in the dark here. If I purchase crossovers from PE with a crossover point of 2500 Hz., will that work?

A distributor web site says that maximum power handling capacity requires a crossover that will not be below 4500 Hz.

I can not design a crossover, but would purchase packaged crossovers. Could use help.
 
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