As far as the SPL part is concerned I have always experienced the exact
opposite with about 6hrs logged on a LinearX RTA testing this theory.
More dense air inside a vehicle will help SPL. Denser air is not harder
for subs to compress it is already more compressed (not the technical
explaination). Running the AC does drain the battery some but it
provides more dense air inside the vehicle,but it does suck out some of
the humidity so there's a trade off. It also can help cool amps to a
certain extent. Being at a lower altitude also increases SPL scores. I
live at 4500 feet above sea level and average a 1.5 db increase when I
compete in Sacramento which is roughly sea level. I don't have any
concrete evidence either way concerning humidity and SPL though. The
increase in horse power at lower temp is absolutely correct though.
Ben
'91 SE-R
Silent Thunders Owner Spewed:
<snip>How does this effect drag racing, Joe? You are talking about car
audio.
Well, kiddies, I'll tell you in one word. AIR.
Specifically air density. For car audio, you don't want denser air in
the cab of your vehicle b/c it is harder for your subs to compress it,
and this will cause lower dB readings. From what is done off the lines,
most ppl that I have talked to will actually roll their windows up and
turn the heater on full blast right before pressuring. This expands the
air and hopefully gets rid of some of the humidity as well.<snip>
