FR125S Measurements and Filters

Vikash · 22nd December 2005, 07:16 PM

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

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.

Cal Weldon · 22nd December 2005, 08:05 PM

Is that driver broken in Vikash?

Vikash · 22nd December 2005, 08:07 PM

~50 hours at max excursion.

Cal Weldon · 22nd December 2005, 08:59 PM

50 hours at max?

No wonder it looks poor on the graph, the poor thing is still dizzy.

Geek · 22nd December 2005, 09:12 PM

Bottom < 500Hz looks identical to the modeled curve on WinISD.

hreith · 22nd December 2005, 09:40 PM

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

Landroval · 22nd December 2005, 09:40 PM

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

Vikash · 22nd December 2005, 09:55 PM

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.

Godzilla · 22nd December 2005, 10:07 PM

80db per watt... so low!

Landroval · 22nd December 2005, 10:19 PM

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?

22nd December 2005, 07:16 PM	#1
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	FR125S Measurements and Filters Measured frequency response of FR125S in sealed 9 litres enclosure stuffed moderatly and filterless: 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. __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

22nd December 2005, 08:05 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Is that driver broken in Vikash? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

22nd December 2005, 08:07 PM	#3
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	~50 hours at max excursion. __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

22nd December 2005, 08:59 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	50 hours at max? No wonder it looks poor on the graph, the poor thing is still dizzy. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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22nd December 2005, 09:12 PM	#5
Geek diyAudio Member Join Date: Sep 2004	Bottom < 500Hz looks identical to the modeled curve on WinISD.

22nd December 2005, 09:40 PM	#6
hreith diyAudio Member Join Date: Jun 2004 Location: Heidelberg	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

22nd December 2005, 09:40 PM	#7
Landroval diyAudio Member Join Date: Oct 2004	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

22nd December 2005, 10:07 PM	#9
Godzilla diyAudio Member Join Date: Nov 2005 Location: New York	80db per watt... so low!

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