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-   -   taming harshness of fostex FF125WK (http://www.diyaudio.com/forums/full-range/218669-taming-harshness-fostex-ff125wk.html)

hajj 28th August 2012 09:47 AM

taming harshness of fostex FF125WK
 
I have been playing with my new OB setup for a couple of months now, and after an initial honeymoon with sound of the FF125WK, I am now noticing a certain harshness to the sound (most probably in the 5-10khz region) and was wondering if anyone has witnessed addressed this issue.

I know that Dave (Planet10) said that some zig two-way glue on the back of the foam surround does help a bit, and I'll be doing this.

Another option is to fully Enabl these cones, but I don't know what kind of coating is needed and if/where microgloss would need to be applied.

I have previous experience with Enabl'ing my AN super12, so the technique would not be a problem.

Anyway, my setup is a double H-frame 15 inch subs with FF125WK on a flat panel, crossed actively using a 2x4 miniDSP...

Regards

Nick

bigaudioscotto 28th August 2012 11:58 AM

I say give them a good 150 to 200 hrs to burn in.
I know a lot of guys like the enable sound but to me
it only made the 126e I did over the top bright.
maybe think of adding just a couple coats of Mod podge
after the 200 hrs if your still not happy with them.

Bigun 28th August 2012 12:20 PM

I had the same problem with the my Fostex 127's - a cone break up produces a peak in the response around 7kHz. I tried Dave's tri-foil treatment but it didn't help and I don't believe eNable will help either. As I understand it, you need to use the zig on the back of the cone near the surround (I don't think it's on the foam you want to place it). I want to try this on my FE127's when I get the time.

I do have one FE127 still doing duty as the centre in my home theatre. It's been running for a couple of years and I'd guess it now has around 250 hours on it. The dust cap has been bodged in by inquisitive fingers too. It now sounds a lot better.

hajj 29th August 2012 02:46 PM

well, these should have around 100-150 hours on them already... I'll let them play a big longer then.
Bigun, thanks for clarifying the zig location, I'll do that and see where it leads.
Regards
Nick

planet10 29th August 2012 03:19 PM

Quote:

Originally Posted by hajj (Post 3142759)
I know that Dave (Planet10) said that some zig two-way glue on the back of the foam surround does help a bit, and I'll be doing this.

Goes on the part of the surround that is attached ro the cone and a bit onto the cone.

This driver gives a good idea of the EnABL patterns i tapped out.

http://www.p10hifi.net/FAL/kermit/FF...spice-comp.jpg

dave

planet10 29th August 2012 03:28 PM

Quote:

Originally Posted by Bigun (Post 3142875)
I had the same problem with the my Fostex 127's - a cone break up produces a peak in the response around 7kHz. I tried Dave's tri-foil treatment but it didn't help and I don't believe eNable will help either.

Measurements (done by Mark Fenlon in the big anechoic chamber) show otherwise.

http://p10hifi.net/FAL/images/Compar...E127eN-FRx.gif

But yes, despite what the measures say, even after treatment the ear can pick out a slight edge, a ghost from the 7k peak.

dave

planet10 29th August 2012 03:30 PM

Quote:

Originally Posted by Bigun (Post 3142875)
The dust cap has been bodged in by inquisitive fingers too. It now sounds a lot better.

http://www.diyaudio.com/forums/plane...stcap-fix.html

dave

ODougbo 29th August 2012 05:48 PM

hajj,

The forum has been discussing the 125wk for a few months now, did you see any of the posts/threads?

Also, how/why did you select this driver for an OB?

norman bates 30th August 2012 01:33 AM

has no one made a notch for it ?

Any measurements ?

And yea, it can measure flat but it can be "ringing down" in the time domain (waterfall plot) especially so close to the nasty 8khz range............

6khz (tang band 4" bamboo), not too bad unless you really know what it is doing and defitinely know it shouldn't be there. 6khz adds a nice clang to cymbals........

Norman

Bigun 30th August 2012 02:34 AM

Quote:

Originally Posted by planet10 (Post 3144358)
Measurements (done by Mark Fenlon in the big anechoic chamber) show otherwise.
But yes, despite what the measures say, even after treatment the ear can pick out a slight edge, a ghost from the 7k peak.
dave

was this the full enable treatment, just the tri-foil or something else ?

I only did the tri-foil and I didn't put on the cone the coatings that are used as a base for the enable so there may be quite a difference ??


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