puertorro
DOES ANYONE BUILT SOME PORTED BOX.
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puertorro
DOES ANYONE HAVE A UL 12
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puertorro
THE PARAMETERS OF THE UL 12 ARE WRONG, SO IS VERY DIFFICULT TO MAKE A PORTED ENCLOSURED. WE MEASURED THE SUB AND THE FS IS HIGHER THAN 31HZ, THE QMS,QTS,SPL ARE WRONG TOO. IMAGINE 95DB SPL THAT IS A BIG LIE...
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D-Bass
That sub's efficiency is rated a 96.7db (2.83V / 1m) (coils in parallel).
This is NOT rated like most subs at 1W/1m. 2.83V/1m = 1W@80hm. but rated with 12times the Power(wattage) on this sub.
The sub has dual 1.5ohm coils, rated in parallel. So we aren't measuring at 8ohm, we are measuring at 0.75ohm. BIG difference. Let's subtract power factors back to get a real 1W/1m efficiency.

8ohm=1Watt@2.83V=96.7dB
4ohm=2Watt@2.83V=93.7dB
2ohm=4Watt@2.83V=90.7dB
1ohm=8Watt@2.83V=87.7dB
0.75ohm=12Watt@2.83V=86.0dB

there you have the efficiency in standard car audio terms. 86.0dB @ 1W/1m.
A measurement is nothing, if you don't understand the units.
That's like asking an alien how far his spaceship travelled to get to earth. and he responds with "14 LagYabas". That's useless if you don't know how to convert to units you understand, like miles. suddenly 14 units of distance are actually 3000 lightyears. BIG difference if you were just reading and it said the alien came from 14 LY's away. You assume LY is the same as lightyears, but it's not.
2.83V/1m is not 1W/1m...although the measure the same thing, they are not always the same units.

It's not false advertising, you just need to know what you are looking at.

Another reason I never look at efficiency ratings, you never know what frequency they were measured at. You might burp at 42Hz. The sub's efficiency may be measured at 60Hz, or if the inductance isn't too high, they may be testing at 1kHz where the efficiency is highest. This would actually be a woofer, not a true subwoofer whose inductance would limit it's potential above 120Hz.

[ 04-28-2010, 02:47 PM: Message edited by: D-Bass ]
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