Advice on Tweeter Replacement

neddyboy · 25th October 2010, 10:47 PM

I just picked up a pair of NHT Model 1.8s as a project to fool around with. The surrounds on the 6.5" mids are shot.

I understand that it's difficult to substitute different drivers without changes to the crossover, but I've put in some Vifa poly cone woofers and am generally pleased with the results.

Anyway, my actual question is about the tweeters. I've attached an image of one of them. What are they? NHT identified them as "maybe Fosters" and I've seen other listed as Seas. I think they're mylar cones but honestly I'm not sure. NHT doesn't have any info on the specs for the crossover or the driver.

I don't much like the way they sound and would like to replace them. Is it possible to make any recommendation on what to use instead? I've generally been a fan of fabric dome tweeters, but lately I've been interested in planars and ribbons. I'd like to try the Fountek NeoCd1.0 1.5" ribbon but it's a very different driver. IIRC ribbons go lower than other tweeters, yes? I wouldn't be averse to modding the crossover if that's what it takes.

Can anyone fill me in, positive or negative?

Racket Scientist · 26th October 2010, 05:15 AM

Don't know anything about your specific speaker, but this might be interesting reading for you:
Zaph|Audio

neddyboy · 28th October 2010, 04:57 PM

Thanks Racket. I'll be poring over that site for a while!

25th October 2010, 10:47 PM	#1
neddyboy diyAudio Member Join Date: Sep 2006	Advice on Tweeter Replacement I just picked up a pair of NHT Model 1.8s as a project to fool around with. The surrounds on the 6.5" mids are shot. I understand that it's difficult to substitute different drivers without changes to the crossover, but I've put in some Vifa poly cone woofers and am generally pleased with the results. Anyway, my actual question is about the tweeters. I've attached an image of one of them. What are they? NHT identified them as "maybe Fosters" and I've seen other listed as Seas. I think they're mylar cones but honestly I'm not sure. NHT doesn't have any info on the specs for the crossover or the driver. I don't much like the way they sound and would like to replace them. Is it possible to make any recommendation on what to use instead? I've generally been a fan of fabric dome tweeters, but lately I've been interested in planars and ribbons. I'd like to try the Fountek NeoCd1.0 1.5" ribbon but it's a very different driver. IIRC ribbons go lower than other tweeters, yes? I wouldn't be averse to modding the crossover if that's what it takes. Can anyone fill me in, positive or negative?

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26th October 2010, 05:15 AM	#2
Racket Scientist diyAudio Member Join Date: Jan 2010	Don't know anything about your specific speaker, but this might be interesting reading for you: Zaph\|Audio

28th October 2010, 04:57 PM	#3
neddyboy diyAudio Member Join Date: Sep 2006	Thanks Racket. I'll be poring over that site for a while!

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