Poll: Is 3dB, 6dB or 10dB double the SPL?
Posted 27 Dec 2009 - 19:18
The original poll/question: "Is 3dB, 6dB or 10dB double the SPL?" is still here to find, but it was closed to answers by an administrator; see:
The overwhelming answers of the poll are really wrong.
The correct answer is: SPL means Sound Pressure Level. 6 dB more of this level means the double sound pressure.
We have the subjectivly perceived loudness (volume), the objectively measured sound pressure (voltage), and the theoretically calculated sound intensity (acoustic power):
Here is a helpful link:
Doubling of the volume (loudness) should be felt by a level difference of 10 dB − acousticians say.
Doubling the sound pressure (voltage) corresponds to a measured level change of 6 dB.
Doubling of acoustic power (sound intensity) corresponds to a level change of 3 dB.
6 dB represents a doubling of sound pressure.
6 dB represents a doubling of voltage (RMS amplitude).
6 dB less SPL means a doubling of distance.
3 dB SPL increase requires double the power.
3 dB represents a doubling of sound intensity.
Posted 27 Dec 2009 - 19:23
Wide acceptance of an idea is not proof of its validity.
Posted 27 Dec 2009 - 19:25
This seriously did not need to be bought back up again.
lol. It was closed for a reason chap and you've just opened a nice big can of worms lol
2008 Street A: 145.8.................................................................2013: Street B: 149.1 - Uk Champion
2009 Street A: 145.9 2014: Street B: 150.7 - Uk Champion
2010 2nd in Street C: 138.1 (1 12" + 250wrms) 2015: Street B: 150.8 - Uk Champion
2011 Street C: 147.9 2016: Street Stock NL: 151.4 - Uk Champion
2011 Monster: 157.8 (12" and 9wrms)
2012 Street B: 148.1
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Posted 27 Dec 2009 - 19:50
Front mids - Rockford T162s
Rear mids - Rockford T152s
Tweeters - Infinity 10.7T
Subs - 2 15" Fi BTLs
Amps - 2 SAZ2500d's . SAX100.4d
Others - 4 Banner Running Bull Batteries. 5 bulk pks ov Singer Expert. 0awg wiring. Phonix PLD1 The Epicentre.
Posted 27 Dec 2009 - 20:25
- Memphis Belle 5 Channel Amp
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- Alpine 7998R Head unit
Posted 27 Dec 2009 - 21:38
Ford Fiesta Mk3 2.0si - (STILL) in progress (!) Alpine Mk1 #F1 Head Unit & Processor source
2x JL 1000/1 into a 13w7 Front Sub sealed.
JL 300/2 Pair for 9" Mid Basses
JL 300/2 Pair for Ti Elite 5's & tweets passive....... ..........one day......
VW Passat B5.5 2002. Alpine DVA7996 >> Audison Voce System
SFC > BitOne, AC AD Link > Voce 5ch Amp - 12" Sub 3" Mid and Tweets
> Voce Due and 6.5 Comps installed for Master OEM
VW Golf Mk2 Daily Driver gone but not forgotten :-(
Posted 27 Dec 2009 - 22:06
"Before beginning, disconnect the negative (-) terminal of the battery prior to working on the positive (+) terminal to prevent a short to ground. This is important, unless you want to spend the rest of your life with a nickname like "Sparky," or "Smokey." Reconnect the negative terminal only after all connections have been made".
Posted 28 Dec 2009 - 19:33
Posted 28 Dec 2009 - 19:50
Posted 28 Dec 2009 - 20:41
will go round to mates and take a picture of his cavity as mine has a sub box shoved in it