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Old 22nd December 2005, 08:16 PM   #1
Vikash is offline Vikash  United Kingdom
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Default FR125S Measurements and Filters

Measured frequency response of FR125S in sealed 9 litres enclosure stuffed moderatly and filterless:

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As you can see, it's faily erratic above 1kHz (+/- 6db up to 20k) so I was curious what filters some of you have been using, and any measurements (with or without filters) would also be helpful.
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Old 22nd December 2005, 09:05 PM   #2
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Is that driver broken in Vikash?
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Old 22nd December 2005, 09:07 PM   #3
Vikash is offline Vikash  United Kingdom
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~50 hours at max excursion.
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Old 22nd December 2005, 09:59 PM   #4
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50 hours at max?

No wonder it looks poor on the graph, the poor thing is still dizzy.
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Old 22nd December 2005, 10:12 PM   #5
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Bottom < 500Hz looks identical to the modeled curve on WinISD.
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Old 22nd December 2005, 10:40 PM   #6
hreith is offline hreith  Germany
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HobbyHiFi 1/2006
Re=7.1 Ohm
Le=0.39mH
Fs=44Hz
Qm=3.6
Qe=0.66
Qt=0.56
Sd=50cm2
Vas=8.7l
Cm=2.4
Mm=5.3g
Rm=0.41
BL=4.0

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Old 22nd December 2005, 10:40 PM   #7
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A notch for the 1,5kHz bump might be one. I doubt the 3,5kHz and 6,5kHz are that bad. Mmm, maybe I should finally get a pair of those FR's, something to play with for the holidays.

I wonder if anyone has tried the FR/WR with this ScanSpeak aperiodic vent:
http://www.madisound.com/cgi-bin/ind...11089&pid=1189
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Old 22nd December 2005, 10:55 PM   #8
Vikash is offline Vikash  United Kingdom
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Quote:
Originally posted by Cal Weldon
50 hours at max?

No wonder it looks poor on the graph, the poor thing is still dizzy.
I like to ensure drivers are adequately run-in before measuring T/S. They are left to rest long enough to undizzy themselves before measuring.
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Old 22nd December 2005, 11:07 PM   #9
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80db per watt... so low!
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Old 22nd December 2005, 11:19 PM   #10
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Default Re: FR125S Measurements and Filters

Quote:
Originally posted by Vikash
Measured frequency response of FR125S in sealed 9 litres enclosure stuffed moderatly and filterless.
Why cant we see any baffle step slope in these measurement? Is this inroom and/or close to a wall?
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