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Old 6th January 2008, 02:47 AM   #1
OzMikeH is offline OzMikeH  Australia
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Default Bargain Jaycar Foster ribbon array with FE207E?

Was shopping for bits for my 10kHz 24dB/oct active XO when I found these ribbons on special, Again.

http://www.jaycar.com.au/productView...Max=&SUBCATID=

That prompted me to search on here to see what people have done with these ribbons. I'm considering using Two of these per channel wired in parallel for 4 ohms which would be a good efficiency match for my 207s. It should help vertical dispersion a bit too.
I'm using a couple of TA10.1 amps which are happy driving 4 ohms.

(before anyone says "You won't hear much difference that high" - Unfortunately I can hear a lot better than 99% of people above 15k)

A pair of these is about three times the price of the FT17H so I'm expecting a reasonable improvement, or would it be a mess? It's hard to tell if I can get 2 of these close enough together to form an effective line array.

Any thoughts?
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Old 6th January 2008, 05:58 AM   #2
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Default Re: Bargain Jaycar Foster ribbon array with FE207E?

I have a pair of those i haven't tried out yet. I got them based on their very good reputation.

dave
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Old 6th January 2008, 06:05 AM   #3
OzMikeH is offline OzMikeH  Australia
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These beasties.

Looks like they need a waveguide, might mount them from the inside of the baffle and go nuts with the roundover bit.

Bugger it, I'll get some and have a tinker with my singulars, figure out what I want to do before I start on the Curvy Changs.
I'm out of action for any heavy work for the next couple of weeks, can't wear shoes until my foot heals up. I hurt it doing things that I should have been wearing shoes for....

Edit: Sorry about that ^^^^ it isn't a swear word in Australia. Stuff it instead.
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Old 6th January 2008, 06:36 AM   #4
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Quote:
Originally posted by OzMikeH
Edit: Sorry about that ^^^^ it isn't a swear word in Australia.
The list of censored words was choosen by an Ozzie...

dave

PS: mine came with a waveguide, i was figuring i'd use them without.
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Old 16th January 2008, 08:28 AM   #5
OzMikeH is offline OzMikeH  Australia
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They arrived today.
Not exactlky as shown in the pictures, the four philips head screws come from the back, the threads protude slightly from the front.

the rolled threads in the front steel plate are stickong out the front as well.

the last slot to the bottom edge is 19mm, so if two were used in a mni line array the distance between the two groups of emission holes would be 38mm.
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Old 16th January 2008, 03:22 PM   #6
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You take pics of yours, i'll take pics of mine?

dave

PS: i have bits for an EnABL kit here for you. Need to touch base.
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Old 17th January 2008, 07:55 AM   #7
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im very interested and wishing to make some bookshelfs using these and other jaycar drivers. I believe they would require an additional mid-range driver but this would complicate the crossover design which I am very shakey with. Any thoughts on how to design such a crossover? For bookshelfs are one of these tweeters per channel sufficient?
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Old 17th January 2008, 01:10 PM   #8
OzMikeH is offline OzMikeH  Australia
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Alex: You could make some good bookshelf speakers using a 6 inch or 8 inch fullrange driver.

I am intending to use these with some Fostex FE207E which cover 30Hz to 12kHz in the right box.

You could use these simply with an FE207E with the right series capacitor and the right inductor in parallel with the Fe207E run full range.

These are only useful as a supertweeter, on top of a fullrange driver or as part of a three or four way system.

Dave, I cant upload the pictures, I'm doing exactly the same as I normally do and it isn't working. Mine all have the number 0151 on the back.

Some of these have gouges on the back, they were poorly packaged.
I pulled one apart to see if I can trim one end off to get two of these closer together on a single custom front plate. a 38mm gap is too big. It looks way too hard, I have emailed you the photos directly, the only thing I could do is a deep, hornlike waveguide to couple them together.

If anyone else wants high res pictures of these, (including the insides) PM me.

If you decide to take yours apart be careful, the magnetic field is pretty strong but the plastic dowels help a lot when putting it back together.

(On a second look the picture posted earlier is spot-on)
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Old 17th January 2008, 02:21 PM   #9
jnb is offline jnb  Australia
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Quote:
Originally posted by OzMikeH
Edit: Sorry about that ^^^^ it isn't a swear word in Australia.
I hear ya
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Old 17th January 2008, 11:29 PM   #10
OzMikeH is offline OzMikeH  Australia
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Are these ribbons more tolerant of DC than normal tweeters?
A very small fuse in series to protect the tracks would be better than a DC blocking capacitor.
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