Subs for the 8: What sizes fit?
#26
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Sorry, 3dB is not twice as loud as before. 10dB is twice as loud as it was before. 10dB requires 10x the amount of power. Doesn't seem intuitive, but it is the way it is.
Also, a ported box is only louder than a sealed box around the resonant frequency of the port. Below that resonant frequency it is less loud, above it, it is roughly equally as loud.
Also, a ported box is only louder than a sealed box around the resonant frequency of the port. Below that resonant frequency it is less loud, above it, it is roughly equally as loud.
Last edited by rkostolni; 10-27-2005 at 09:42 AM.
#27
Registered User
Originally Posted by rkostolni
Sorry, 3dB is not twice as loud as before. 10dB is twice as loud as it was before. 10dB requires 10x the amount of power. Doesn't seem intuitive, but it is the way it is.
Also, a ported box is only louder than a sealed box around the resonant frequency of the port. Below that resonant frequency it is less loud, above it, it is roughly equally as loud.
Also, a ported box is only louder than a sealed box around the resonant frequency of the port. Below that resonant frequency it is less loud, above it, it is roughly equally as loud.
6dB is twice the pressure and I think is a more accurate number for "twice as loud" especially at the higher volumes. So in my opinion 4X the wattage into the same speaker (provided it can handle it) will increase volume 6dB and become psycologically "twice as loud".
-Mr. Wigggles
Ps. for low frequencies you can get a 6dB SPL increase by adding another woofer with the same wattage as the first. In this case you would be getting 6dB increase in sound with only twice as much power.
Last edited by MrWigggles; 10-27-2005 at 10:56 AM.
#28
The Professor
#30
Registered User
Originally Posted by staticlag
http://www.sengpielaudio.com/TableOf...sureLevels.htm
If you notice in the chart it takes a 20dB increase in SPL to increase pressure 10X.
At low frequencies (where waves can't cancel out), 10 subs all playing at the same level will create 10X the pressure or 20dB more SPL than just 1 sub.
You can use this calculator:
http://www.sengpielaudio.com/calculator-soundlevel.htm
To see that increaseing pressure by a factor of 2 (ie. 2 subs versus 1) does infact create a 6dB increase not 3dB.
Trust me on this one.
-Mr. Wigggles
#31
RX8 and a Truk....
Originally Posted by Critters
Ta... Darrrrrrr
Thanks C.
If anyone cares, I found shots of the actual box, and junk (with the baffles removed).
amp:
sub box (downward-firing)
#32
The Professor
Originally Posted by MrWigggles
I said pressure. There's a difference and it is an important one.
http://www.sengpielaudio.com/TableOf...sureLevels.htm
If you notice in the chart it takes a 20dB increase in SPL to increase pressure 10X.
At low frequencies (where waves can't cancel out), 10 subs all playing at the same level will create 10X the pressure or 20dB more SPL than just 1 sub.
You can use this calculator:
http://www.sengpielaudio.com/calculator-soundlevel.htm
To see that increaseing pressure by a factor of 2 (ie. 2 subs versus 1) does infact create a 6dB increase not 3dB.
Trust me on this one.
-Mr. Wigggles
http://www.sengpielaudio.com/TableOf...sureLevels.htm
If you notice in the chart it takes a 20dB increase in SPL to increase pressure 10X.
At low frequencies (where waves can't cancel out), 10 subs all playing at the same level will create 10X the pressure or 20dB more SPL than just 1 sub.
You can use this calculator:
http://www.sengpielaudio.com/calculator-soundlevel.htm
To see that increaseing pressure by a factor of 2 (ie. 2 subs versus 1) does infact create a 6dB increase not 3dB.
Trust me on this one.
-Mr. Wigggles
Horsepower(Intensity) vs. Torque(Pressure) argument rekindled... more or less.
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