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1st August 2006, 01:00 PM
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#1 |
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diyAudio Moderator
Join Date: Apr 2002
Location: Chatham, England
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Tolerances on AV15
I'm quite frustrated by this driver, and would appreciate input from anyone else that has measured it.
My results, after two days of running in at 16Hz are shown below. They don't seem correspond with the listed parameters, even slightly. 
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Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort |
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1st August 2006, 07:39 PM
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#3 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Those look so bad parameters that I can't help feeling something must be wrong. Would you be prepared to try another measurement method?
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www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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1st August 2006, 07:39 PM
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#4 |
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diyAudio Moderator
Join Date: Apr 2002
Location: Chatham, England
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__________________
Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort |
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1st August 2006, 07:44 PM
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#5 | |
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diyAudio Moderator
Join Date: Apr 2002
Location: Chatham, England
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Quote:
Additional info- that is measured with the coils in series to give a 4Ohm load, the souncard doesn't seem to like driving 2ohm loads. When I get home, I might try using a power amp to buffer the signal to a few watts
__________________
Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort |
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1st August 2006, 08:27 PM
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#6 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Well try the power amp and see how you go. Have you measured 4 ohm loads before?
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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5th August 2006, 02:00 PM
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#7 |
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diyAudio Moderator Emeritus
Join Date: May 2003
Location: UK
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How hard are you driving these? I normally take drivers to mechanical excursion limits to really stretch out the surround and spider. Being a large driver it might take longer than usual possibly.
__________________
"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.) |
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5th August 2006, 02:10 PM
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#8 |
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diyAudio Moderator Emeritus
Join Date: May 2003
Location: UK
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Also, it's such a large driver so are you able to hold it up vertically with good clearance around for measusuring? You might get consistently bad readings if this was done motor down on a table...
__________________
"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.) |
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5th August 2006, 07:06 PM
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#9 |
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diyAudio Moderator
Join Date: Apr 2002
Location: Chatham, England
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It was clamped in an open door frame for testing, I don't have a fancy jig like yours!
 As I said above, I've put this to one side for the moment to try and decrease the pile of half finished projects littering my workshop. I suspect that longer running in may well be the answer, the only problem is I can't do anything else whilst I'm doing it.
__________________
Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort |
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