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-   -   Foster FE103A (http://www.diyaudio.com/forums/full-range/117482-foster-fe103a.html)

rca9449 15th February 2008 05:15 AM

Foster FE103A
 
Does anyone know what's the specs for the vintage Alnico Foster FE103A. I have a pair coming and just wondering if they would be usable with a 3/4 watt single ended darling amp.

Also, has anyone try them on open baffle with a low frequency helper - something similar to this: http://www.quarter-wave.com/OBs/OB_Design.pdf

I plan to copy this design except running the FE103A without any crossover.

Thanks in advance.

planet10 15th February 2008 05:45 AM

Actual T/S will vary from unit to unit.

Fs from 85 to 150, efficiency from 89-92 dB.

When you get them please post pics. I have had quite a few of these, some need some attention before use.

dave

Piek 15th February 2008 08:22 AM

Hi, here is the response of the Sigma (red line), if this is comparable...

FE103Sigma

-Micha

rca9449 15th February 2008 11:11 AM

I will post pictures when they got here Dave. By the way, have you ever used two of them in parallel per cabinet - I can use the 6db efficient bump - wonder if that will mess/smear up the wonderful midrange.

Thanks for the link Micha. I will check it out.

Scottmoose 15th February 2008 03:49 PM

If you had them on the same baffle, it will destroy the mids + treble. Not recommended. If you must, bipole or possibly one on the top (though there's an increased risk of damage) will give a semi-omni effect & not cause the same lobing issues you'd otherwise run into.

badman 15th February 2008 04:19 PM

Minor Nitpick
 
3 dB efficiency bump, 6dB sensitivity bump.

rca9449 15th February 2008 05:06 PM

thanks badman - that's what i meant.

that's what i thought Scott. i will just use one. thanks.

planet10 15th February 2008 05:13 PM

Quote:

Originally posted by rca9449
By the way, have you ever used two of them in parallel per cabinet - I can use the 6db efficient bump - wonder if that will mess/smear up the wonderful midrange.
We had 2 pair of these in BD-Pipes. They worked well.

dave

rca9449 7th March 2008 03:04 PM

Pictures
 
2 Attachment(s)
They finally arrived. Pictures enclosed as promised Dave.

They are different - can't really use them. Perhaps someone has an odd ball that they want to trade. I really want to use that alnico magnet.

rca9449 7th March 2008 03:05 PM

2nd pict
 
2 Attachment(s)
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