Sealed or Ported for Spl

sh*t dude I have seen 3 db seperate 1st and 7 place in some comps. Esspecially when you get into the upper end. Once you get past, I think i was told, 138.7 db, then every 3 decibels gives sounds twice as loud as before.double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

I'm talkin about an average person with an average ear.  Not the $5000 db machine that detects .0000000000001 db differences.  I know that you have to double the power to get that extra 3 db but I think the guy askin the question is probably not going for the world title for spl, so his gain of 3 db at let's say 120 db is not goin to be a HUGE, noticable difference right?  I would do it, but if you're going to notice a major difference is what I'm questioning.  Maybe, maybe not.  I'll have to take it to the sound lab that we have here at the college.  See what a port does compared to a sealed.

15L7=Ported, Ported, Ported..did i mention ported?Dave

Pioneer Premier DEH-P660

15" Kicker CVR

Profile AP1000M

It's Loud

yep ported massive box, thats about all i have to say about thaty along with alot of power2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

Actually: . If the cone area is doubled and the cone excursion remains the same, the acoustical power increases by a factor of four:

"actually boxmaker , you ARE wrong. The db scale is really wierd but 3 or 4 db is enough to almost double the amout of volume you hear. I think it only takes like 6 db to double the sound you actually hear. Theres a difference in db you here and electronic or digital db but both are close in scale. The numbers may not be EXACT but I know Im very close." I'm going to have to say, no, ayou ARE WRONG. "Note the following characteristics of the decibel scale:     * It is a relative scale, ie, it is based on a ratio that compares sound intensity or pressure to a standard reference level. The reference level used is the lowest sound pressure commonly detected by man and is equal to 2 X 10-5 N/m2. Thus, the intensity level in decibel sound pressure level (SPL) = 20 log10 sound pressure/2 X 10-5 N/m2.     * It is logarithmic, not a linear scale. Doubling sound pressure results in a 6-dB increase in measured sound pressure, while a 10-fold change in sound pressure is reflected by a 20-dB change in measured sound pressure.     * The log of 1 is 0. Thus, 0 dB SPL does not correspond to the absence of sound but rather indicates that the sound pressure of the measured wave is equal to the reference sound pressure."

I've heard 140 db and then 150 db.  In an enclosed area where other sound is negligable.  The difference was very small, I would not have noticed if I had just been listening to it like the radio.  If you can notice a change in 3 db (with your ear not a machine) then you're.... superman or something.