Fostex 166e BLH Tweeter - diyAudio
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Old 1st May 2005, 12:52 AM   #1
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Default Fostex 166e BLH Tweeter

Just finished my Fostex back-loaded horns with the FE-166E and I really like them so far. I'm thinking of experimenting with a tweeter. Of course, Fostex recommends their $144 model. Has anybody had any good luck mating this horn to some other tweeter a bit less pricey?
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Old 1st May 2005, 01:13 AM   #2
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There are probably a number of horns that would work out fine... you just need to find one that will keep up with the 166e. Fostex has a budget horn that likely will work fine. The Foster horn that comes in the Radio Shack tweeter pod is also very nice if you can find some. Even the plastic horned Fosters that RS sold would probably do the trick (i know that the less efficient alnico ones are quite sweet)

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Old 1st May 2005, 01:14 AM   #3
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The plastic horn is a variation on this alnico one from the 70s

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Old 1st May 2005, 07:08 PM   #4
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I use the fostex FT17H crossed over with a .68u PP cap and it gives the fe166 just the right amount of boost at the very top.

http://www.madisound.com/pdf/fostexdrivers/ft17h.pdf
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Old 1st May 2005, 09:10 PM   #5
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Quote:
Originally posted by uvellani
I use the fostex FT17H crossed over with a .68u PP cap and it gives the fe166 just the right amount of boost at the very top.
That one is commonly used, and is good... my feeling is that it and the RS pod tweeter are very closely related (it is very nice when you find the RS pods for $5/pr at a garage sale

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Old 1st May 2005, 11:15 PM   #6
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What about the FT-100HT. Looks like a trade-off between size and sensitivity. Would I just be padding off that extra 3.5db anyway? The 166E is 94db and I haven't seen predictions for what, if any, boost is received from the BLH.
http://www.madisound.com/pdf/fostexdrivers/100ht.pdf
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Old 2nd May 2005, 04:06 AM   #7
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Quote:
Originally posted by cantskienuf
FT-100HT
Looks like a "manta-ray" style horn. Perhaps more aimed at the low end of the pro market (that is a guess)... it is an interesting horn i hadn't previously paid any attenion too. It goes at least an octave & a half lower -- which also likely means its top-end extension is also likely an octave & a half less. Since the intended application is super-tweeter for a couple bucks more personally i'd putthe FT17 ahead in the short list.

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Old 12th May 2005, 02:12 AM   #8
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Default Impressions

I went with the FT17 and it does add some sparkle; however, I'm not sure just yet if they're able to keep up with the drivers. I used a 0.47 uF Auricap (Fostex recommends 0.33 - 0.68) and although they are slightly used caps, they may require some additional break in. The tweets seem to need to be pointed at the listening position with the horn pointed straight ahead. At some point in the future, I think it would be worthwhile to try a more sensitive tweeter. Not to imply that this horn is anything short of the best speaker I have ever owned, and of course there may be some additional changes with additional hours. Other caps may also result in more high frequency response. Just thought I'd report my initial impression in case somebody searches FE-166E projects.
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Old 12th May 2005, 02:56 AM   #9
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Default Re: Impressions

Quote:
Originally posted by cantskienuf
I used a 0.47 uF Auricap (Fostex recommends 0.33 - 0.68)
nominal XO with a 0.5 uF cap is going to be 40 kHz... this is a common trick to essentially attenuate a T that is too hot. In this case you raise the Ts level by increasing the size of the cap... i'd think something as high as 1.5 uF might be called for.

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Old 12th May 2005, 03:59 PM   #10
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Yes 1,5, even 2uF works good.

I myself much prefer FT 96H than FT 17. It is two times more expensive but is 4 times better and the price of about 100$ for a piece is still resonable for a good supertweeter.
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