Foster FE103A

[rca9449]

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]

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]

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

FE103Sigma

-Micha

[rca9449]

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]

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]

3 dB efficiency bump, 6dB sensitivity bump.

[rca9449]

thanks badman - that's what i meant.

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

[planet10]

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]

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]

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