Tweeter to suit Fostex FE207

[ian0902]

Any help with suitable tweeters (and cross-over (capacitor)) for this driver greately appreciated...

Ian

[Illusus]

Fostex FT17H is a good match, use an L pad and a 1.5uf cap, this is a fostex recommended set up, just check the ft17h datasheet, the schematic is at the bottom left of the page. Here is the link: http://www.madisound.com/ft17h.pdf
This is a great, relatively inexpensive solution, I've used the 17H with fe206e with good results. If budget allows you can move up to either Ft96H or T90A, these are better but IMO you'll get more bang for the buck with FT17H.

[Variac]

One of the Chinese ribbon tweeters. I can only vouch for the Aurum Cantus, which seems much better than the FT17 . The Fountek have their fans and are a little bit cheaper, but I haven't heard them...

These ribbons are now around $80- 90 ea.


Here's someone with a common interest!:

http://www.diyaudio.com/forums/showt...682#post445682

[Lostcause]

Hi chaps, OK so I’ve been listening to my MK FE207E MLTL’s for some time now and with a lot of playing about I get nice bass response with 4ohms of series resistance only..
The thing is that it’s missing something and I think I need to add tweets.
I was listening to a certain track in the car (I Am Kloot - Mermaids) and there is the sound of bags of money constantly in the background…. Play it on the MLTL’s and they sound like bags of crisps!!
Thinking it was maybe my amp, I put in my old 3 ways and it sounded like money again (the rest sounded awful!)
So it appears to be the speakers…bugger!
What should I do guys? Fit some FT17H’s in the top corners or ………
I haven’t tried taking the series resistance out because I then need my active subs to come back into the room for low level listening… I don’t want that!
As always, your experience is always invaluable!

[Lostcause]

just realised this is probably in the wrong forum.....can a mod move it to the fullrange?

[Scottmoose]

Try a rearward firing FT17, which will give you the air & ambiance you crave (it's an excellent unit for the price).

The 207 doesn't extend upward as far as the Fostex charts imply -in reality, it's about all-done by 12KHz - 13KHz, and should be viewed, like the FF225K and the FE208ESigma, as a wide-range rather than a full-range device. Not a bad thing at all really: you can hand over to super-tweeters for the highest frequencies and dedicated woofers should you need sub-40Hz bass, while keeping the XOs simple and well outside our most critical / sensitive hearing regions.

BTW -a set of phase plugs, if you haven't got them, will improve the midband of the 207 considerably. www.planet10-hifi.com

[Lostcause]

Thanks Scottmoose, phase plugs are already in there and they certainly mellow out the midband!
These are right in the corners of the room to raise the base, will rear firing tweets be OK here?

[sreten]

Originally posted by Lostcause

What should I do guys? Fit some FT17H’s in the top corners or ………
I haven’t tried taking the series resistance out .....

Hi, bypassing the resistor with a capacitor will boost treble, /sreten.

[Lostcause]

Originally posted by sreten

Hi, bypassing the resistor with a capacitor will boost treble, /sreten.

Hmmm, worth a try...what value would I need though sir?

[sreten]

Hi,

I suggest a good read of MJK's articles on correction circuits.
I think he has abandoned the series resistor only approach.

e.g. :

http://www.quarter-wave.com/General/BSC_Variable.pdf

http://www.quarter-wave.com/Project05/Project05.html

Uses a similar circuit so start with say 2uF ?

tip : use a range of cheap electrolytics to experiment, three
values in series and parallel combinations give a wide range,
then actually use a higher quality component.

/sreten.