hm... i have a 5.6 cu box w/ 8x16 l-port

[bgowdy 5,000+ posts]

hm... i have a 5.6 cu box w/ 8x16 l-port. i cut 1 1/2 inch off the port and i think i gained a db

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[mast240 10+ year member]

whats the depth on the port?

 

[trumpet 5,000+ posts]

If you didn't confirm this with an SPL meter it's entirely imagined. You can't detect a difference of 1 dB with your ears.

 

[mast240 10+ year member]

or, if you can detect it by ear, you gained around 3 db's... but i highly doubt you gained that much by cutting down your port area