Bandit 2941 was missing the point. Here's his quote:

"So that should work for subwoofers the same way, so adding a second
subwoofer powering it exactly the same as the first will yield a 3db
gain."



He's recognizing the 3 dB gain from doubling the power, but ignoring
the additional 3 dB gain from doubling the number of speakers.

Scott Gardner



On Sun, 28 Dec 2003 23:33:38 -0500, "Mark Zarella"
wrote:

Seems I'm missing the point here. I didn't realize that what you said was
being debated. In any case, yes, you're correct. Who was disagreeing with
it?

"Scott Gardner" wrote in message
...
In Paul's situation, a 3 dB gain was all he could expect, since he
doubled the cone area WITHOUT increasing the total power delivered
(500 Watts). Sound like that's about what he got.

Jamie (Bandit) is claiming that doubling the cone area AND doubling
the power delivered will only give a 3 dB increase, which is simply
wrong. He would be correct if we were talking about point-source
energy sources, like his textbook describes, but with loudspeakers at
low frequencies, cone area has an effect as well as total power. Note
that this phenomenon does not apply to tweeters. This is because the
speakers must be mounted close together (relative to the wavelength
being produced) for the synergistic effect to take place. Subs are
dealing with very long wavelengths, so this is easy to do. Tweeters
produce energy with such a short wavelength that even if you put them
side-by-side, you probably still wouldn't get the effect.

Scott Gardner


On Sun, 28 Dec 2003 20:34:22 -0500, "Mark Zarella"
wrote:

Paul, a 3dB gain is nothing to scoff at. I'm sure the difference was
substantial, but I doubt it was any more than the 3dB Bandit was talking
about.

"Paul Vina" wrote in message
news:h_EHb.680189$Tr4.1699274@attbi_s03...
While technically correct, it rarely works that way. I went from a
single
Kicker S12L5 with 500 watts on it to a pair of older RF DVC12s with the
same
500 wats on the pair (250 each) and it's WAY louder. I haven't measured
it
yet, but you can easily tell the difference. According to your post
the
difference should have been minimal, and probably less thanthat since
the
L5
had about 20% more cone area than a single DVC12.
Basically I'm saying two will be a lot better than one in every way.


Paul Vina



"BANDIT2941" wrote in message
...
Adding a second sub will do a lot more for you that changing your
sub
or
getting a bigger amp will. Even without adding more power it will
get
considerably louder. I replaced the S12L5 in my wife's car because
I
killed
it for the second tim eand put in a pair of older RF DVC12s and it's
louder
and better sounding.

Given that adding a second sub getting the same exact power as the
original
sub, you will see a 3 decibel gain. I don't believe that adding a
second
sub
while halving the input of both will show much of a gain. In other
words,
2
subs each getting 75 watts each is not going to be significantly
better
than 1
sub getting 150 watts. Any thoughs?