180.5db Volvo |
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4DPA
Registered User Joined: 11 April 2007 Status: Offline Points: 1127 |
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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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Disco Stu
Old Croc Joined: 03 March 2005 Location: United Kingdom Status: Offline Points: 2487 |
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Probably about the only car that has enough structural integrity to take that much pressure without disintegrating
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All you need to know is:
Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
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ToNy MoNtAnA
Registered User Joined: 23 August 2007 Location: United Kingdom Status: Offline Points: 471 |
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"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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tommysb
Registered User Joined: 24 April 2006 Location: Finland Status: Offline Points: 1036 |
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Nice alloys
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Jake_Fielder
Old Croc Joined: 08 October 2007 Status: Offline Points: 4231 |
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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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cnics
Young Croc Joined: 23 March 2005 Location: Worksop Status: Offline Points: 676 |
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Good for at least another dB, apparently. So what's that, another 10,000watts?
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Rob Beech - Technical Director - Cnics Audio
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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Does is really take 26000w to get 180 dBL?
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Jake_Fielder
Old Croc Joined: 08 October 2007 Status: Offline Points: 4231 |
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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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tommysb
Registered User Joined: 24 April 2006 Location: Finland Status: Offline Points: 1036 |
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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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Jake_Fielder
Old Croc Joined: 08 October 2007 Status: Offline Points: 4231 |
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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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tommysb
Registered User Joined: 24 April 2006 Location: Finland Status: Offline Points: 1036 |
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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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cnics
Young Croc Joined: 23 March 2005 Location: Worksop Status: Offline Points: 676 |
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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.
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Rob Beech - Technical Director - Cnics Audio
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