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Post by benttop (Steve) on Feb 13, 2008 12:49:34 GMT -7
It's not very precise because of the way the settings are established, but it is roughly 1.8 db per click on the individual clicks. I think bedroom is -12 db to start but I could be mistaken there.
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Post by brad737 on Feb 29, 2008 7:48:42 GMT -7
The manual says Bedroom starts at -7.2 db and goes down to -30 db.
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Post by sudsysul on May 2, 2008 9:11:36 GMT -7
I guess I don't understand the db range that is stated for the AirBrake.. maybe somebody can explain. After all, if I'm at 100-110 db level without attenuation, -1.8db per click wouldn't be particularly noticeable, but it is. So that figure might mean something else?? Is it stated as the effective reduction in sound level or as a change in speaker/cabinet rated sensitivity?
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Post by sparrowhawk (Bob) on May 2, 2008 10:41:01 GMT -7
dB is a measure of the sound pressure wave. dB is a log scale because human hearing is logarithmic -- it takes 10x the power (pressure wave) to be perceived by the ear as a doubling in volume.
According to the "math", -3 dB is equivalent to dropping the amp power rating by a factor of 2, So your 38 watter becomes a 19 watter.
-10 dB results in a perceived halving of the volume.
-20 dB is 1/4 the volume.
-30 dB is 1/8 the volume.
Of course this is not 100% accurate in practice, but you get the idea.
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Post by sudsysul on May 9, 2008 4:51:09 GMT -7
I used my Airbrake on stage with a Marshall JTM45 last weekend for the first time. I was surprised that I settled on 1 click for the best attenuation setting that evening. I would have thought I'd be on 2 or 3, but the first click was perfect. Diddling at home I'm on 3 or 4 with my Z28. There's more going on than just dropping 1.8db because that amp is mighty loud with no attenuation... hmmmmm??? I'm wondering if it changes the way the amp reacts to the load as well, ie. I am interpreting volume settings with the "feel" I normally associate at a given amp setting. The attenuated amp feels less stiff, which is what the amp feels like when it's cranked and the tubes are cooking.
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