taming harshness of fostex FF125WK - diyAudio
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Old 28th August 2012, 09:47 AM   #1
hajj is offline hajj  Lebanon
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Default 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
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Old 28th August 2012, 11:58 AM   #2
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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.
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Old 28th August 2012, 12:20 PM   #3
Bigun is online now Bigun  Canada
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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.
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Old 29th August 2012, 02:46 PM   #4
hajj is offline hajj  Lebanon
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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
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Old 29th August 2012, 03:19 PM   #5
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Quote:
Originally Posted by hajj View Post
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.

Click the image to open in full size.

dave
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Old 29th August 2012, 03:28 PM   #6
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Quote:
Originally Posted by Bigun View Post
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.

Click the image to open in full size.

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
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Old 29th August 2012, 03:30 PM   #7
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Originally Posted by Bigun View Post
The dust cap has been bodged in by inquisitive fingers too. It now sounds a lot better.
FE12x dustcap fix

dave
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Old 29th August 2012, 05:48 PM   #8
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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?
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Old 30th August 2012, 01:33 AM   #9
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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
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Old 30th August 2012, 02:34 AM   #10
Bigun is online now Bigun  Canada
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Originally Posted by planet10 View Post
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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