Sound testing: how to?
 

I'm just about to swap my exhaust and I've noticed in work we now have a decibelmeter. How should I go about measuring it? I'd guess it's at a certain distance and perhaps angle and at a certain rev count but I don't know what for any of them.

Any help greatly appreciated.

Re: Sound testing: how to?
 

I think if it's for a track it's at 6k rpm not sure where to stand though.

Re: Sound testing: how to?
 

As far as I remember it's 1m away at a 45 degree angle using a decibelmeter that is A weighted.
Revs need to be 3/4 of redline.

The A weighting of the decibelmeter is important.

Re: Sound testing: how to?
 

Cool thanks guys, after a bit of searching I found this from a teeside track day I think it was:
Sounds in the same ballpark, will check that the dbmeter we got will do A weighted and I'll see what mine come out at.

Purely for a curiousity point of view, I'm not intending to do a track day or anything just yet but would be nice to have a number on it.

Re: Sound testing: how to?
 

I can tell you that if it's your Akro you're measuring..... It's bloody loud. I thank you :)

Re: Sound testing: how to?
 

LOL it's all relative to the rev range. It's only offensive when I want it to be. It just happens that's more often in the nicer weather ;-) I'm thinking the street extreme might be a tad louder but I'll have some figures to go by.

Re: Sound testing: how to?
 

the teesside autodrome measurement spec is correct.

The test will be done at 5500 rpm on the SV.
Done one for Berlin at Croft and that was the test method, and that was a giggleworthy 97dB (the previous 2 tests were 101 and 104)

Whats the setup of your arka?

Re: Sound testing: how to?
 

My akras in my tuono are 105dbs on tick over.

Re: Sound testing: how to?
 

WHAT!!!
Speak up!:mrgreen:

How f***ing loud is your bike on fully chat

Re: Sound testing: how to?
 

lol, well, out of curiosity, I'd be inclined to have a play with a decibelimomeiterthingbob too!

All I need to know is that yer ears bleed whilst wearing earplugs and a helmet, on a pair of Leo's...and that'll do me :)
Never had that one the SVs with any of the cans..but bleddy hell, that Raptor may as well be hitting you over the head with a lump hammer

Re: Sound testing: how to?
 

The tone changes at higher revs and because it's not il4 I don't think it gets as loud as them on full, I've been told it's not as loud going along?

Re: Sound testing: how to?
 

There's no way your bike would be 105db at tickover on an A weighted decibelometer. If it was unweighted then yes but then nobody measures noise unweighted.

Re: Sound testing: how to?
 

It's more or less probably as you say not 100% accurate but to give you an idea we started it up my wife was about 3 feet in front of me talking to me and I could hear a word just saw her lips moving, trust me this beast is bloody loud.

Re: Sound testing: how to?
 

Oh I dont doubt its loud mate and I don't doubt you have seen 105db on a decibelmeter but I am saying its not been measured correctly.

When you A-weight a decibel meter is ignores frequencies below 1kHz, which is why when you measure V-Twins they come up quieter as their exhaust notes fall below this threshold.

Re: Sound testing: how to?
 

I've realised this noise testing is a bit of a nonsense :) To have my bike measured from 97 to 104 in a week shows that wind, what the bike is parked on and surrounding objects all make a difference.

and going on that, if I blip my throttle the noise is about 120dB so whats the point? Its as quiet as a lamb at 5500 steady revs (104 dB but blip it and its ear splitting. and who rides a bike at 5500 stead revs on a track?

Yorkie Chris's is off the scale :)

C