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Help me decide which tweeter replacement

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TrexT,
Interesting project. I have a pair of Advent/2's myself and I think the dipole tweeter deal is the weak link in the chain. I can't say for sure, but I've been under the assumtion that the tweeters are 16ohm-ers wired in parallel since these are 8ohm speakers. I actually have a pair of those Dayton tweeters (the shielded version) and I think they sound very nice (especially for the money). I've been wanting to upgrade my Advent tweeters, too, so this might be just the ticket. I'll let you know how it goes. - Mark
 
I would STRONGLY recommend giving Madisound a call. Besides being a great group of guys and being very knowledgable, there always seems to be someone there who has tried almost any driver swap imaginable, and is more than willing to share the info. They have been doing this forever. While not as glossy as Parts Express, they are always on top of their game.

Erik
 
Trext I have used that dayton driver on a few things, very good for the price.
Right now there actually installed in a pair of wharfdale w60e's that one tweet was bad.

If you have a link to the Advent2's info I could try to give a somewhat educated response
to your question. Or you could just try them as there not very expensive plus they are a
good tweeter that you may use on something else down the road, that's what happen with me
and the wharfdales, I had the tweeters and tried them, they sound better then the originals!
 
TrexT said:
Well I decided to replace the tweeters in my Advent2 with one but I don't know what would be a proper replacement. There's no ohm rating on them. Some of you were debating doing this modification, so I'm looking for feedback. Parts Express has this I'm considering. http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=275-070
Click to expand...

May I shamelessly self-promote? (:no:/:yes:)

Check -speaker parts-free ads- later on tonight. I have an extra set of German-made, LPG 1" silk-dome, shielded tweeters that I am letting go. They might be perfect for your application.
 
MarkAnderson said:
TrexT,
Interesting project. I have a pair of Advent/2's myself and I think the dipole tweeter deal is the weak link in the chain. I can't say for sure, but I've been under the assumtion that the tweeters are 16ohm-ers wired in parallel since these are 8ohm speakers. I actually have a pair of those Dayton tweeters (the shielded version) and I think they sound very nice (especially for the money). I've been wanting to upgrade my Advent tweeters, too, so this might be just the ticket. I'll let you know how it goes. - Mark
Click to expand...

Sounds like you're half way there Mark. I was also thinking of upgrading the x-over caps being they are so old. When I hooked them up eveything sounded as they should with the woofer being the strongest link. Even with bad surrounds these things sound solid. How would you do the wiring of the new tweeter? Cut one tweeter pair and leave the other or will you double up the wires?
 
Kegger, I've got zilch on any specs. I might try Madisound (thanks bigerik) to inquire about them. I'll let you know.
 
Bigerik said:
I would STRONGLY recommend giving Madisound a call. Besides being a great group of guys and being very knowledgable, there always seems to be someone there who has tried almost any driver swap imaginable, and is more than willing to share the info. They have been doing this forever. While not as glossy as Parts Express, they are always on top of their game.

Erik
Click to expand...

Yep, I have been down this road before. You could get good results if the ohms match up properly and you wire them properly.

However, I had an old pair of KLH bookshelf speakers that had blown tweeters. I called madisound and they told me that I would be better off replacing all of the drivers and the crossovers. So, we found some nice drivers that would fit into the holes that were already in the KLH's. Madisound asked me the dimensions of the cabinet and then, with the help of a computer program, built a crossover to match the drivers and cabinet. The results were amazing! Those speakers sounded much better than with the old crossovers and drivers and the whole deal was less than $100.00 :thmbsp:
 
Tullman, Madisound custom designed/built your X-overs and gave you 4 new drivers for under $100? More $$ than I want to put into this project but that seems like a fair price. Glad you're happy with them. My Advents might be getting some nice veneer to replace that yucky walnut vinyl. We'll see.
 
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Tullman that does sound like a darn good price and a good deal that they designed and
built xover's based on your new drivers and cabinet construction, very cool indead!

I would love to see some pics and excactly what they gave you! You could start a new
thread if you felt like it, I for one would be very very interested.
 
TrexT said:
Sounds like you're half way there Mark. I was also thinking of upgrading the x-over caps being they are so old. When I hooked them up eveything sounded as they should with the woofer being the strongest link. Even with bad surrounds these things sound solid. How would you do the wiring of the new tweeter? Cut one tweeter pair and leave the other or will you double up the wires?
Click to expand...

It certainly can't hurt to upgrade the caps. I'll prolly do the same. But I'd suggest that you hold off on the new caps until you're happy with the results of the transplant. You may find that the caps values need to be tweaked. As for the wiring, you could go either way. If memory serves, both pairs of leads originate from the same points on the x/o. You could use both or eliminate one pair. For the sake of neatness, I'd just snip one pair off. - Mark
 
Right Mark, I'll holld off on the cap thing. As I recall the original caps had really high MFD values don't know if that has anything to do with the double tweeter setup or not.
 
So I pulled my Advents apart and the tweeters check 1.9 ohms with the DMM suggesting to me a 4 ohm nominal impedance. Since they're wired in parallel, we're looking at a 2 ohms for the tweeter circuit. :wtf: If I'm missing something, please help me out (uh.....Gordon?). If I'm on the right track, replacing the existing tweeters with an 8 ohm-er will throw the x/o frequency way off. We need to determine the correct x/o frequency for these before we proceed. Anyone? - Mark
 
MarkAnderson said:
If I'm on the right track, replacing the existing tweeters with an 8 ohm-er will throw the x/o frequency way off. We need to determine the correct x/o frequency for these before we proceed. Anyone? - Mark
Click to expand...

It will, but you can adjust the series capacitor either up or down in value (forget which way it goes, will find out & repost) to adjust for new impedance.

But are you saying there are 2 tweeters in each cabinet? I thought the II's were a 2-way?
 
They are a two-way with twin twinklers :D . You are correct about adjusting the cap value. It'd just be nice to know where to start. BTW, the tweeter circuit is kinda interesting - two caps in series with a resistor parallel to one of them and a coil parallel to the tweeters. - Mark
 
THat's a second-order crossover, with a "shelf-up" circuit, to increase the extreme-high-frequency response of the tweeters.

I wouldn't be surprised, at a DCR of 2 ohms or so for those tweeters... I've seen that from some AR and Advent stuff before. It's always an eye-opener to check DCR on an AR3A tweeter.... it's like 1.8 ohms, sometimes, on some versions!

The Dayton silk-dome is a perfectly good choice to use with an Advent 2 woofer. Or, if you wanna go "big league"... the SEAS 27TFFC is an excellent choice, from Madisound. Still only like $27 each... great value for the money.

I'd be inclined to use a second-order crossover, at about 2100 Hz, with either one of these. Should work fine...

Regards,
Gordon.
 
TrexT said:
Tullman, Madisound custom designed/built your X-overs and gave you 4 new drivers for under $100? More $$ than I want to put into this project but that seems like a fair price. Glad you're happy with them. My Advents might be getting some nice veneer to replace that yucky walnut vinyl. We'll see.
Click to expand...

Ok, I am trying to remember but I think it was well under one hundred per speaker for sure. I am thinking about $180. for the whole package. I tried looking for the reciept and of course it is either buried or lost. I got SEAS drivers, which are not too expensive. The tweeters were in the $25 range, the woofers were in the $40. range and the crossovers were around $25. This was several years ago, so the prices were less than they are now. They fit the holes. Madisound didn't seem to think designing the crossover was a big deal. They knew the measurements of the drivers, of course.

I had some friends over a couple of weeks ago and people were raving about the sound of those speakers. I had them out in the garage system. The cabinets need refinishing but still sound good.

I liked the results so much that I did the same thing with my Grandma's old Fisher bookshelf speakers. Now, my daughter has them in her dorm room. Nice!
 
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