On Thursday, December 8, 2016 at 4:23:02 AM UTC-5, Gz wrote:
Ralph Mowery wrote:
In article , lid
says...

Per TNSTAAFL:
We're looking at two Bosch dishwashers - one claims a noise level of 50 db,
and the other a noise level of 53 db - the features and functionality are
pretty much the same - there's about a $100 price difference.

I can't speak to db except to note that the db scale is logarithmic -
i.e. 50 vs 51 is a lot bigger than it sounds.


One Db is not vety much in sound level. To the ear it should be just
the minimum change that you can detect with average hearing. To get a
an idea about db, for 3 db of change double the distance. Say listen to
something at 2 feet away and then back up 2 more feet. At 8 feet it
would be 6 db of difference and to get to 10 db you have to back up to
20 feet.

Doubling original distance should be 6 dB change. 3 dB is a change of power
by 1/2 or double. SPL is a level specified by power. To double intensity,
like a voltage level, it takes 6 dB or four times the power. Similar to car
acceleration. It takes four times the HP to double acceleration.

Greg

+1

I'm glad to see that the political rants in this newsgroup didn't drive everyone away.

still some good posts

m