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-   -   Foster 8F3 (http://www.diyaudio.com/forums/full-range/227312-foster-8f3.html)

xecluded 8th January 2013 01:23 PM

Foster 8F3
 
2 Attachment(s)
Does anyone know what I can use these Foster 8F3 for. My friend gave me two pairs of these along with the crossovers for them. Crossover is a 1st order with a 2mh choke to woofer and a 30uf cap to the tweeters which wired in parallel. He does not have woofers for them and can't remember where/how he got these neat looking things. I borrowed these picts from ebay but mine look exactly the same.

IG81 9th January 2013 12:18 PM

Neat. I've always wanted to find a pair of 10F3 locally, no luck yet. I understand the 8F3 is the 3" model.

One thing to check for is Stiff Surround Syndrome. You can sometimes tell by how supple the surround feels, but measuring Fs is a better way to tell. In any case, I'd expect the Fs for good surrounds to be quite high anyway, so you're likely better off crossing these around 300Hz in a small sealed box or aperiodic stuffed-line, or even OB if you fancy that. I recommend a PLLXO to save money and avoid interaction with the impedance peak that is likely around 150Hz-250Hz.

IG

xecluded 10th January 2013 02:07 AM

Humm, are these 8F3 full range or tweeters - they seem really small.

I still have a brand new pair 10F3 16ohm. Maybe it's time to bring them out and play ;)

Cal Weldon 10th January 2013 02:16 AM

I have the 10F3's as well and have been looking to get my hands on a pair of 8F3's for the Cornu spiral horn. Any chance you want to sell one of the pairs?

planet10 10th January 2013 02:25 AM

I have 3 of these, althou the cones are dark. A lovely driver... think 40-50 yr old precursor to FE83, or FF85. Mine came out of a Noresco FAST ... XOed to (IIRC) an 8 Isophon alnico woofer.

Cal, i've not found a use for these yt, so maybe we can do a deal. I think mine are at least part-way to phase plugs installed.

dave

xecluded 10th January 2013 02:35 AM

Quote:

Originally Posted by Cal Weldon (Post 3318947)
I have the 10F3's as well and have been looking to get my hands on a pair of 8F3's for the Cornu spiral horn. Any chance you want to sell one of the pairs?

Sure. I will sell you one pair though you may want to check with Dave first as he is in the same area as you and shipping cost maybe a lot less than coming from Texas.

IG81 10th January 2013 12:38 PM

Quote:

Originally Posted by xecluded (Post 3318934)
Humm, are these 8F3 full range or tweeters - they seem really small.

They are "fullrange" drivers AFAIK. A more sensible term might be mid-tweeter though.

Dave, what's the Fs on your 8F3's?

IG

Cal Weldon 10th January 2013 01:36 PM

xecluded,

I think you're right. If Dave has them, it's probably best to deal with him. Thanks for understanding.

He's only about 60 miles as the crow flies but it takes about 4 hours to getl there. Drive, line up, ferry ride, then drive some more.

chrisb 10th January 2013 05:07 PM

Quote:

Originally Posted by Cal Weldon (Post 3319456)
xecluded,

I think you're right. If Dave has them, it's probably best to deal with him. Thanks for understanding.

He's only about 60 miles as the crow flies but it takes about 4 hours to getl there. Drive, line up, ferry ride, then drive some more.



Wassa matter - out of fuel for your jetpack ;)

yeah, a round trip can chew up a whole day and the best part of $200 (not including the beer, so double(?) that )

Cal Weldon 10th January 2013 05:45 PM

Quote:

Originally Posted by chrisb (Post 3319798)
Wassa matter - out of fuel for your jetpack ;)

Mr B you always crack me up. :D


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