Modern Vespa

Please don't answer with -"not enough?"
I'm looking for a number to compare to.

Your not wanting to hear "not enough" certainly limits things.

I'd say my Stebel Nautilus Air Horn on the GTS is realistically 20+ times louder than the stock POS wussy horn on the BV.

No idea what the stock decibel rating on Vespa stock wussy horns are.

Sorry can't help you much, my Buddy 150 came from the factory with a Stebel Nautilus....

Seriously?

Uh-huh....
That was one of the selling points of the 'special edition' Buddy 150s.

Does the WOLO style of horn with the "sail" shaped, "horn like" sound hole, fit into an ABS GTS? Or is it mostly the small disc shaped horns that fit?
I'm not after an air horn with pumps, etc..
I've had the horn cover off to do wiring but not at present.

Some one download a decibel app on your phone, and check it please.

My GTS is in the shop or I would do it.

Wont be my flip phone.
Matters more if I know what "style" of horn fits? So far I'm going with a Hella disc shaped horn or maybe a pair, once I look back inside the leg shield.

i have a Yar Ton HYF-260 turbine horn in my buddy 125...115dB at 2m...a little better output than a Stebel Nautilus (139dB at 4in and 115dB at 6ft) and it's not an air horn so it's plug and play...

http://www.yarton.com.tw/en/product/Turbine-and-Mini-Trubine-Horn/hyf-260.html
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Web Bike World tested some commonly sold horns in 2008-the best of the lot was the Hella Supertone. They found that many horn mfgs did testing wrong and distances matter much for decibels and vary with tests others did.
Supertone is 2.36" thick x 4.72" diameter so a tight fit in an ABS Vespa.
Hella horns vary from 110 decibels up to 116 over their whole model range. From what little I've read what matters is how a horn is heard tone wise so much as a large volume of sound as with an air horn type sound. It gets technical real fast too.
The direction the horn above is pointing has the "useful" sound negated! The horn above is, perhaps, designed for backwards use?

i noticed this as well when i opened it up...bought that scooter early this year and found that when i opened it up...haven't rotated it yet though, not sure if i have the clearance behind the front cover...either way the sound has to go through the plastic body work to get out so i'm sure it bounces around in there...if any of these scooter companies wanted the horns useful they would not be shielded by plastic body parts

I installed the Seger 136 db horn. I ordered from Scooterwest and it fit very easily behind the horn cover. It is definitely louder than the stock horn and very affordable.

https://www.scooterwest.com/horn-seger-136-decibel-136-low-key-horn-136.html

Challenge accepted! BRB!!

From 6 feet directly in front of the bike, I was able to get 96.2 dB*, consistently on a 2017 GTV before the folks in the parking lot started giving me the side-eye.

*I'm using the Decibel X app for iPhone. Hope that helps!

I also use that app for comparing the noise level for work applications. I note that I'm only interested in relative sound levels rather than absolute numbers tho.

Thanks
Miguel

If you're traveling near a rock concert, you might want something a bit louder.
What?
http://www.thecavanproject.com/13-loudest-bands-ever/

The scooterwest ad listing clearly states this doesn't fit into the space of a 2015 & up ABS scooter. That alone helps me pick from horns out there, as many have that same shape and general size. It seems that only a small disc horn will fit-the question becomes which of those is enough louder than the OE horn?
Which is where I began this thread.

Thanks!
From the web bike world test- they questioned the numbers many horn mfg.'s provide as they got much less from some of them when they took a look.
Just me and shooting in the dark, I would think distance, as with your 6 feet vs. say directly in front of a horn, especially when not inserted into a vehicle, that a much higher reading might be obtained?
OE horns have DOT regs that say whats what.
It seems from the numbers that an OE horn at 6' vs. a Hella disc horn,#012-588-011 at (supposedly) 108 decibels is a similar volume of sound. But it's not like dollars and cents, those few decibels are quite a few more?
The WIKI on car horns is interesting. They got a "dark start" as the "Prince of Darkness", guy named Lucas from UK (well known to British car people like me as having electrical systems that left you in the dark) invented them. The wiki answered one question I had about how much dual horns matters in sound level. Typical dual horns increase the decibels by 3. What matters is if and how that horn sound is heard or "perception" of the sound made. It gets into the Hz of the sounds and musical notes which are not my territory. A concert is said to be ~ 100-120 decibels. City traffic as heard inside a vehicle, is ~ 85 decibels. A typical car horn is 107-109. A train or ships horn isn't a much higher figure but is a much different sound to our ears.
Another e.g. of sound comparisons- a library sound level or a bird song is ~ 40 decibels which is said to be ~ 1/8th of 70 decibels. 70 is given as a typical vacuum cleaner sound or a chain saw (which must be at idle as I know all too well! they are much louder than any vacuum!!) so decibels are easily misread when we talk horns.
It's all about if and how the sound is heard. Dual horns helps that happen.

I can still remember the quiet of the parking lot when I left the tire factory! It was like a total void of sound, almost like you'd entered a vacuum chamber of sorts. Weirdly pleasant in fact. Even the smell was gone and the air freshened. In many areas of the plant the floors literally shook with sound. Sound of many kinds was coming at you from most all directions yet we mostly wore protection only after OSHA came into play and even then many shirked the muffs as it was a personal choice to wear them/i.e., use protection-just like with scooter riders...

So to add to what Kantuckid was saying....if I can remember my High school algebra correctly....every 10 decibel increase means twice the loudness (sound pressure). So if you increase from 50 to 60 dB, it isn't a 20% increase, it is a 100% increase (double) in loudness. So 70 dB is double 60 dB or 4 times 50 dB, and so on. So 100dB is 32 times as loud as 50dB.

I am sure someone will correct me if I twisted this up.

Sorry - I should have specified this fit easily on my 2009 GTS.

Thanks but no apology needed when trying to help people!
The ABS gizmo is stuffed in that space on the newer scoots.