Snell JII replacement tweeter recommendations

[lt_texan]

So the coating on these fabric dome tweeters are pretty much "see through." So I'll need to find some replacements.
(No I don't want to try a DIY coating.)
I understand these are 1" 4ohm and manufactured by (long gone?) Tonegan.
The faceplate is 94mm, and having trouble finding that.

Thanks in advance.
Dan

 

[Galu]

These have a 94mm faceplate, but have 6 ohm DC resistance and 8 ohm nominal impadance:

https://www.micro-semiconductor.com/datasheet/3b-D19TD05-08.pdf

Can you measure the DC resistance of your tweeters to make sure they actually are nominally 4 ohm impedance?

 

[Galu]

I'll give your thread a bump.

You'll probably want higher quality 94mm, textile dome tweeters than those above (you don't state a price range), but a 4 ohm impedance may be the stumbing block - that is, if you don't wish to modify the crossovers to suit an 8 ohm replacement.

https://www.visaton.de/sites/default/files/dd_product/G 20 SC.pdf

 

[lt_texan]

I'll pull the tweeters and measure the dc resistance.

Thanks,
Dan

 

[lt_texan]

Here's a question.

Why no reuse the speaker cabinets and buy new woofers and tweeters?

And design a new crossover.

Is that just making more work for the sake of more work?

Or is it getting a better loudspeaker by knowing what I'm putting in the box?

Dan

 

[Galu]

​

It's easier to design a cabinet around the electrical parameters of a new woofer than to find a new woofer which matches an existing cabinet.

Provided your existing woofers are in good condition, fitting new tweeters would be the easier option. However, the replacement tweeters need to be a good match for the old ones in terms of impedance, resonance frequency and sensitivity.

What do you find wrong with the sound reproduction of the speakers as they stand?

 

[lt_texan]

What do you find wrong with the sound reproduction of the speakers as they stand?

Tweeters have bare uncoated fabric. No treble to speak of.

 

[Galu]

The original JII tweeter is available for $105 here: https://www.atomichifiandtv.com/snellpartspricelist.html

Would you prefer something less expensive?

 

[Galu]

The original tweeter is a foster-tonegan 94C70DS-00HD-1

I know you don't want to, but it is possible to re-dope the tweeter domes as described here:

How to Re-Dope Snell Tonegen/Foster Tweeters (Model E, J, K; gens. I & II) | Audiokarma Home Audio Stereo Discussion Forums

It seems to me that you would have nothing to lose (and a lot to gain) by giving it a go! 😉

 

[lt_texan]

The original JII tweeter is available for $105 here: Snell Acoustics Catalog - Atomic HIFI and TV

Would you prefer something less expensive?

Those are not the same tweeters as original. If I'm going to pay a massive premium, I would want the same driver, not a similar one from a different manufacturer.

I know you don't want to, but it is possible to re-dope the tweeter domes as described here:

I've seen that. Looks like a terrible process.

 

[Galu]

Those are not the same tweeters as original.

You seem to know more about these tweeters than I do!

The Tymphany tweeter I linked to earlier would appear to be a cost effective substitute since my research suggests they have a suitable resonance frequency and sensitivity.

https://www.micro-semiconductor.com/datasheet/3b-D19TD05-08.pdf

However, you may have to make some adjustments to the attenuating resistors in the crossover in order to achieve the desired treble level.

Good luck!

 

[lt_texan]

Okay, I went with Morel 1-1/8 soft domes. I'd say I did a lot of research, but they had the correct size faceplate!

Just listening, but I'm super happy.

I had to get out a wood rasp and open up the hole a bit more than taking off the paint.

And what was up with one speaker having such short wires. What a pain that was.

Look at the state of that old tweeter!

Thanks all,
Dan

 

[Galu]

Good result! 😎

Happy listening!