Borrowed a sound meter from work this weekend to see what noise levels the V8 makes.

The sound meter has a weighting button on it that toggles between A and C values. The instruction say – see relevant Health and safety rules to find out what setting you use for a particular noise test.

With the weighting set to A I get a max reading 0f 98dB at 3500rpm

With the weighting set to C I get a max reading of 107 dB at 3500 rpm

Please tell me that the weighting at SVA will be the A value.

Paul

if C stuff some steal wool up the exhaust for the test.

tried that with mine and it came out like 'chaff' from an Apache!

Steve

Where are you taking the test's Paul? You need to be in a large open area to get a decent result, that or an anechoic chamber If your in your garage or even on your drive with walls in fairly close proximity the reading will be off.

The weighting is the range the meter is operating in (if I remember correctly) For instance on the meter I use to calibrate my home cinema gear I use the "C" weighting as this gives a uniform reading over 32-10,000Hz frequency range.


Cheers

Dave

All I have managed to find on the internet is the Australian rules for exhaust testing which clearly state that weighting A is to be used on the fast setting

I had weighting A set for the 98dB breading but had the slow setting in use but I don’t recall the last bit making much difference so I thing I should be OK

Paul

The SVA manual gives it as 101 dB(A) - i.e. 'A' weighted

IIRC - 'A' weighting is to the spectrum of sound that and average human ear will recieve (i.e. ear is not as effective at top and bottom of range therefore a noise of equal pressure would 'sound' louder in the mid of the range.)

C as stated is equal across the range

HTH

The slow setting is used for taking an average reading of sound levels and the fast is used for peak.

Cheers

Dave

Just re checked SVA manual -it does have an (A) after the 101dB

thank god for that ..

Paul

Cheers for the quick replies