Air Horn discussion

[SLYDIT]

remember that 2Db is nearly Twice as loud! 3db increase is exactly 2X loud

[Grant]

Ah.....not quite.
3dB is double the power but 10dB (or 1 Bel) is twice as loud to the average
ear's perception, if there is such a thing as the average ear.

[Ian]

Hi Grant...
From memory, the Hella 110dB was measured at 1 metre, and the Narva was not stated.
Probably safe to assume they are similar...and at the end of the day, both would prove to be an effective, cheap, lightweight, low cost and space efficient upgrade over the rather ineffectual standard horn (NA anyway).

Ian

[poison]

3dB is double the power but 10dB (or 1 Bel) is twice as loud to the average ear's perception, if there is such a thing as the average ear. [Posted via external email]

Ha I was driving home just a short time ago mulling this very thing over in my head, I could not remember if double the volume was 6dB or 10dB, although I do remember that doubling the distance would half the apparent volume.

On this subject has anyone been to MOTAT and given the whispering parabolic dish things a go?? Essentially there are two small parabolic dishes about 15m apart, you whisper into one and the person with their ear to the other will hear it clearly. Pretty amazing. They used to have this in front of Hamilton Museum, but like many nice things in good old NZ it got vandalised.

I noticed in Australia they seem to have a lot of outdoor art features that don't seem to get vandalised like stuff here. So Aussie does in fact have one good point.

[WRW]

The second set I want sounds like the old Ford model T: 'AAOOOOGAH'

I thought about this too but there are always lots on TradeMe
http://www.trademe.co.nz/Trade-Me-Motor ... 6.htm?p=40

Sometimes called a claxton horn.

OOOO and it's red too

[SLYDIT]

ahh thats right..i remember from my boy racer days(haha not that long ago) that 3Db needed double the power....