tuning a Type R

I'm going to build a ported box for my Alpine Type R 12, what should it be tuned to?  The manual says nothing nor does the Alpine site.  I know it needs about 2 CUFT. of space.  I had 2 Audiobahns in a ported box tuned to 36Hz, it really pounds.  How does going up or down in Hz effect SQ and SPL?  I want the bass to hurt!  I'll probably be using 3" PVC cuz I have a ton of it.  Thanks-Alex

i think that 2.0 cubic feet for a single 12" type r, i believe around 1.2 or 1.0 cubic feet would do you justice for this subAlpine cda 9813

jl 500/1

eclipse aluminum 15"

haha forget my post i misread your post, the dimensions i mentioned are for a sealed box, forgive meAlpine cda 9813

jl 500/1

eclipse aluminum 15"

im not expert but i wouldnt use round ports, use a slot port

Yeah-the factory Alpine box for these subs has a slot port bass-reflex design-talk about SPL!   I'm hesitant to attempt to build a slot-port box myself unless I knew exact dimensions so it it properly tuned.  Slot ports are supposed to produce better SQ than a round ports, that is if they are built right

Id make the port about 10.75inches loong if the interior diameter of the port is 3 inches. That should give you a tunning frequency of about 29hz if my math is right. I always tune my boxes that low and have always had good luck with them. Id also invest in a subsonic filter if you are gonna do a ported boxdouble-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

The vented box size for these subs is from 1 to 1.75 cu/ft. I would use a 1.25 cubic foot enclosure with a 4 by 13 inch port.

I guess the port I gave you would be 27.125 herz. I really like to tune low though so I guess its kinda a personal preference thing.double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

What's the differance to your ears in tuning low, like your 27HZ, as compared to tuning to higher Hz-like 35-40HZ?  I want this sub to hit hard and low while remaining somewhat musical.  BTW, what does a subsonic filter do?