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Author Topic: WTB... Fostex T-90 Supertweeter  (Read 202 times)
Henry
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« on: September 27, 2017, 05:36:07 PM »

Do any of you guys/gurls have a left over pair of T-90s from the days before the Horn/Heil two-ways came along?  I didn't buy a pair back in the day and would like to try them on a vintage speaker I have in a second system.

If you'd like to sell a pair, please let me know via PM or email. 

Thanks,
Henry
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Capt. Z
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« Reply #1 on: October 08, 2017, 03:09:41 PM »

Back in the days I bought the T-90 for my horns. Now I have the Heils.

However, mine are not for sale. I use mine with my ACI Sapphire II speakers and a different Cap. Sounds pretty good. The Sound has become more detailed without being aggressive or bright.

Hope you find yourself some T-90.
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Henry
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« Reply #2 on: October 08, 2017, 04:58:47 PM »

What cap do you use in the Sapphires?  I'm going to pair the T90a with some Bozaks. 

Heils are the way to go with Horns for sure.  Smiley
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Capt. Z
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« Reply #3 on: October 09, 2017, 03:30:14 AM »

I believe the Sapphire have a sensitivity of around 89 db/1W

So Ed suggested 0.22uf on the positive leg, which works PERFECT with my Sapphire.
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Henry
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« Reply #4 on: October 09, 2017, 03:01:55 PM »

Cool Capt, thanks.  Mine are in the 90dB range so I was hoping to hear that low values would be a good place to start as I'm becoming penniless in my old age (those 1-1.5uF caps get pricey in the high end brands).  I should be able to rake through a decade of failed experimental parts to make something good happen.  Wink

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Capt. Z
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« Reply #5 on: October 09, 2017, 11:15:15 PM »

You should be able to try some cheap RS caps before forking out the big cash for high quality caps. Or as you said, maybe find some in your chunk pile.

Ed used a 0.33 uf cap on the Fostex T-90 and his horn, Which were somwehere around 93 db

My Sapphire II are 89 db and a 0.22 uf works perfect with that.

So if your speaker is around 90 db you should be fine with a cap just a little bigger then mine.
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