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port area vs spl


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audiomaninc 
Copper - Posts: 108
Copper spacespace
Joined: April 18, 2007
Location: United States
Posted: October 11, 2007 at 1:17 PM / IP Logged  
Does increasing the port area of a given enclosure always increase the spl output of that enclosure?  If this is true, what are the advantages/disadvantages of taking a manufacturers recommended enclosure and adding a bit of port area? 
2003 Dodge Neon R/T
Alpine CDA9813, RF T2000.1bd, RF T162S, RFT142C, RF T600.4, RF T215D4
140.7 @ 28Hz
jvillefinest 
Copper - Posts: 255
Copper spacespace
Joined: December 29, 2003
Location: Florida, United States
Posted: October 11, 2007 at 2:56 PM / IP Logged  
im going to go ahead and say no...but i have been proven wrong before. It shold just change the frequency the port is tuned to.
2007 Acura TSX
SQ setup in the works
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: October 11, 2007 at 3:48 PM / IP Logged  
1: No, changing the port area will have little to nothing to do with SPL of the enclosure.
2: By adding port area, you need to make the port longer to keep the same tuning. This is a disadvantage, as you must make the enclosure larger to allow for the additional volume of the port. The advantage would be this: with a larger port, the speed of the air in the port is slower, which will lower distortion.
A smaller port CAN be shorter, but the air speed in the port is faster, increasing distortion. Generally speaking, you want your air speed to be .05 times the speed of sound or less.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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