Replacing hi-fi tweeters

[Lo-E]

More than likely the crossovers are a textbook design anyway. If you are using tweeters whose Fs/impedance peak is over an octave below the crossover point, it shouldn't make too much of a difference as long as the slope > or = to 12db per octave. There will probably still be some phase issues, but if it is a butterworth design like most older crossovers, and phase cancellations will probably even out. Just give it a listen, and run some slow sweeps through the crossover area and see if you can hear an intelligible difference. If you can you may just need to use an impedance compensating circuit on the tweeter. That way you wont have to worry about messing with crossover components.

Link Removed

Awesome link! Thanks!

 

[Lo-E]

...and 30+year old electrolytics are well past their "best when used by" date.

Well, Bill, you shamed me into doing the right thing: I went ahead and carefully extracted the crossover so I could get a better look at what I was up against.
I've ordered new caps. Where there was room on the (fairly small) PCB, I ordered film caps and elsewhere I'm going to have to go with bipolar Electrolytics again. Not my favorite option, but practicality prevails. I don't want to get into mounting components off the circuit board so new electrolytics will have to do. They're still likely to be better than the old ones.

The 450uF caps for the bottom woofers are going to end up being parallel 200 + 250 units as 450 was not a stock value. 470 is available, but it wouldn't fit on the board. I can stack the 200 & 250 and it'll work.

It turns out there is no attenuation in the stock network. I'll wait it out and see how it sounds. Maybe I'll get lucky.

 

[Lo-E]

Tweets are in, x-overs rebuilt and all is well.

I'm hearing things I haven't been able to hear for quite some time. Real imaging, clean sibilance, vocalists who don't lisp...

So far, I think they're blending pretty nicely with the woofers, so it looks like I got lucky as far as attenuation is concerned. We'll see when I get some more listening time in.

Thanks again everybody for your suggestions.

 

[Corey Peloquin]

Tweets are in, x-overs rebuilt and all is well.

I have the same problem with one of my C40 tweeters......what was the part number on the Dayton tweeter you dropped into place?

 

[Lo-E]

Oh, gosh…. That was 6 years ago!
I’ll see if I can find it for you. I’m not sure I kept any of the documentation but I’ll look.

 

[Corey Peloquin]

Oh, gosh…. That was 6 years ago!
I’ll see if I can find it for you. I’m not sure I kept any of the documentation but I’ll look.

Thanks......I ran across this thread searching for replacements for the exact same tweeter!
I figured it was a long shot for you to even see this, but the miracle of the internet still exists lol.

 

[Lo-E]

Thanks......I ran across this thread searching for replacements for the exact same tweeter!
I figured it was a long shot for you to even see this, but the miracle of the internet still exists lol.

Once in a while the net lives up to its potential!

Extremely busy for the next week or so but I’ll try to remember to look for you.

 

[Corey Peloquin]

Not a rush, take your time, and thank you!
It's still working, however, it isn't as clear as the other speaker and the dome is showing signs of deterioration.

 

[Leovagner]

Once in a while the net lives up to its potential!

Extremely busy for the next week or so but I’ll try to remember to look for you.

Hi Lo-E I've same your problem; My Kef C30 (T33 Sp 1211) tweeter is dead! Please can u show me type of Dayton tweeter who have used to replacement? Thank you very much. Leo

 

[Lo-E]

Hi Lo-E I've same your problem; My Kef C30 (T33 Sp 1211) tweeter is dead! Please can u show me type of Dayton tweeter who have used to replacement? Thank you very much. Leo

I have the same problem with one of my C40 tweeters......what was the part number on the Dayton tweeter you dropped into place?

Corey and Leo, please forgive me for not addressing this sooner. I completely forgot about this and then, after Leo reminded me, it took a while to find the old packaging.

I replaced these tweeters a long time ago so I can’t swear that these are still available.

 

[Lo-E]

I replaced these tweeters a long time ago so I can’t swear that these are still available.

Well, now I can:
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