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180.5db Volvo

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4DPA View Drop Down
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    Posted: 19 December 2007 at 7:53pm
Excuse me if this is old news............

but a Volvo Estate is  that  some kind  of  dark  humour

http://www.audiojunkies.com/blog/551/world-record-1805-db-from-a-single-subwoofer





Edited by 4DPA - 19 December 2007 at 7:56pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 12:09am
Probably about the only car that has enough structural integrity to take that much pressure without disintegrating
All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ToNy MoNtAnA Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 3:01am
"The 180.5 score was done with a Digital Designs 9918Z 18" subwoofer receiving 26,000 watts of power from four Stetsom 7KD amplifiers. Fifteen Powermaster 16 volt batteries were used as well."

Extremelly extremelly surpised it handled that amount of power. But then again maybe it reached 180.5db for 1 second then the coil fried. Hmmmm






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Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 1:44pm
Nice alloys 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jake_Fielder Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 2:40pm
Yea, i found that about a week ago, but i couldn't find anything else about it anywhere...?
 
I was trying to look up the driver specs (cos i assumed that it would have a comedy sensitivity of about 82db 1w/m or something) but i couldnt find it mentioned anwhere......
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cnics Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 7:32pm
Good for at least another dB, apparently. So what's that, another 10,000watts?
Rob Beech - Technical Director - Cnics Audio
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wafflesomd Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 8:05pm
Does is really take 26000w to get 180 dBL?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jake_Fielder Quote  Post ReplyReply Direct Link To This Post Posted: 21 December 2007 at 8:58am

Well i just did some working and I find it hard to believe actually:

Say the driver is 95dB @ 1w/1m (which is probably quite generous)
Double the power 10 times and you get 1024w and ~125dB
Double the power 5 more times and you get 32,512w and 15dB more so ~140dB
Cos its in a car its gonna get a few more dBs for being corner loaded (kinda). And thats not taking into account power compression(which at tens of thousands of watts will be v. high).  I dont see how it can get to 180.... seems like nonsense!!
 
What we really need now is stu (master of calculations!) to sort this out, Because it sdoesnt seem possible.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 21 December 2007 at 12:54pm
You get about 12dB of cabin gain at the right frequencies, that goes up as frequency drops too I think.

10w=105dB
100w=115
1000w=125
10kW=135

It WILL be possible. But it's pointless anyway. It's not any kind of musical output, it's just pressurising and depressurising the cabin, not REALLY making useful sound.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jake_Fielder Quote  Post ReplyReply Direct Link To This Post Posted: 21 December 2007 at 1:53pm

Ah, cabin gain!...  thats what I was trying to say when I said "it will get a few more dB for being corner loaded (kinda)"!!!

I really wanna know what sensitivity that drive is!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 21 December 2007 at 2:51pm
You could work it out by going backwards?

http://linearteam.proboards12.com/index.cgi?board=winisd&action=display&thread=1087022128

That link reckons you get 12dB/octave below the car's lowest mode..

180.5=26kW
170.5=2.6kW
160.5=260W
150.5=26W
140.5=2.6w

Right, so that looks a bit uneasonable. BUT if you reckon a volvo 240 is about 4metres long, (guess), you get a gain of 12dB/octave below 40Hz. In reality, it's probably a higher frequency than this, I'd say about 60Hz (due to not using the whole space. probably, so a length less than 4m). so at 30Hz, you get an extra 12dB from cabin gain. at 15Hz, you're getting 24dB cabin gain.
so at 15Hz,
 2.6W=116.5dB
1.3W=113.5dB
so it is possible that the sensitivity of the driver/enclosure is around the 110dB/w mark, at very low frequencies. It is probably tuned to play one frequency very efficiently, at the expense of others. It is also possible that the space it was being played in was smaller, making cabin gain greater.

That's my guess as to ROUGHLY what's going on anyway!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote cnics Quote  Post ReplyReply Direct Link To This Post Posted: 22 December 2007 at 4:39pm
anyone know what their measurement technique is and at what distance?   Hope it didn't tell you all this in the link ad i missed it.
Rob Beech - Technical Director - Cnics Audio
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