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Old 19th April 2008, 02:52 PM   #1
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Default Fe127e at 50 hours

I have about 50 hours on a pair of Fe127e's and they seem to be opening up nicely. Nice imaging with a good amount of bass and the mids are as most say, very clear. When comparing them to the W3-871s, the highs are still definitely better on the little TB's. The highs on the 127e's still have a lot of "sssss" sound to them. I know they have a lot more burn in in time left but will that clear up as time passes?
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Old 19th April 2008, 05:43 PM   #2
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You might need to add BSC. I found they had a tad too much upper energy for my likings until I added about 2dB BSC. See what I mean about this circuit that's added.

http://diyaudioprojects.com/Speakers...flex/index.htm

One other thing is that top end can depend on partnering equipment. Others have much more experience with this driver so should be able to tell you about any long term SSSSS.
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Old 19th April 2008, 07:45 PM   #3
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The 126 & 127 have a peak at about 7k which adds an edge to the music. Some people use a notch (a band-aid which never completely solves the problem). I treat the driver to make the problem less objectionable.

dave
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Old 20th April 2008, 12:25 AM   #4
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Quote:
Originally posted by rabbitz
You might need to add BSC. I found they had a tad too much upper energy for my likings until I added about 2dB BSC. See what I mean about this circuit that's added.

http://diyaudioprojects.com/Speakers...flex/index.htm
Additional driver break-in is not going to change anything above 500 Hz. But as you get more bass, the top won't seem as bright.

As mentioned, you likely need a BSC. Here is a online calculator you can use to size a
speaker baffle step compensation circuit. The amount of attenuation you need will be room and amplifier dependent. In general, a solid state amp is going to require more correction than a tube amp.

Other tricks include moving the speakers closer to the wall and toeing them in.

What type of enclosure and amp are you using? Post some pictures too!
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Old 20th April 2008, 04:04 AM   #5
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Quote:
Originally posted by rabbitz
You might need to add BSC. I found they had a tad too much upper energy for my likings until I added about 2dB BSC. See what I mean about this circuit that's added.

http://diyaudioprojects.com/Speakers...flex/index.htm

One other thing is that top end can depend on partnering equipment. Others have much more experience with this driver so should be able to tell you about any long term SSSSS.
I notice it using both my T-amp and my Pioneer home theater amp.

Quote:
Originally posted by planet10
The 126 & 127 have a peak at about 7k which adds an edge to the music. Some people use a notch (a band-aid which never completely solves the problem). I treat the driver to make the problem less objectionable.

dave
You're reffering to the EnABL process? - It is interesting but I don't know enough about it to understand how it works. Does the added driver coating and the "dots" improve the high end or does it add more bass. Does the process affect sensitivity?

Quote:
Originally posted by gmilitano


Additional driver break-in is not going to change anything above 500 Hz. But as you get more bass, the top won't seem as bright.

As mentioned, you likely need a BSC. Here is a online calculator you can use to size a
speaker baffle step compensation circuit. The amount of attenuation you need will be room and amplifier dependent. In general, a solid state amp is going to require more correction than a tube amp.

Other tricks include moving the speakers closer to the wall and toeing them in.

What type of enclosure and amp are you using? Post some pictures too!
Thanks for the link, very helpful tool for experimenting and learning. My speakers are already about 10 inches from the back wall and slightly toed in. I'd prefer to stay away from adding any kind of filter as I feel it takes away from the simplicity of a single driver but I'll wait to hear how they sound after another 100-150 hours or so. They still sound great, I'm just trying to get them closer to their full potential.

Right now they're just in some simple .25cu ft boxes. I already have larger cabinets on my mind. I'm still going to keep it simple and I'd like to utilize the wasted space taken up by my speaker stands so a not too intrusive floor stander will be next. I like the TABAQ or maybe a TQWT.

Anyway, here are my current speakers (you may have already seen these in another thread)
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Old 20th April 2008, 05:04 AM   #6
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Quote:
Originally posted by type
You're reffering to the EnABL process? - It is interesting but I don't know enough about it to understand how it works. Does the added driver coating and the "dots" improve the high end or does it add more bass. Does the process affect sensitivity?
No, i'm not. The pre-treatment i do before the EnABL (quite close to my previous version) is aimed at the resonance.

EnABL does something completely different (the really short description is that it drastically improves downward dynamic range).

My entire treatment causes a loss of ~1/2 dB of sensitivity.

dave
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Old 3rd May 2008, 04:52 PM   #7
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Just a quick update. They're at about 80hrs now and things seem to have smoothed out. Maybe it's the bass coming on but the "sss" effect is almost non-existent now.

These things disappear when playing well recorded music like Pink Floyd & the Police. At times the imaging is almost spooky.
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