Can I go ported with 2 RL-P 12's on these dimensions?

[ghart999 10+ year member]

All I can do in my trunk is 14"x32"x18.5", which is 3.45 ft^3 after sub displacement only (not port displacement).

Correct me if I am wrong, but box volume of a ported box is after the volume of the port right?

Playing with WinISD with 3.0 ft^3 at 34Hz, in order to get port velocity down to 17 m/s, I need port area of 49.1 in^2 with length of 72.5 in^2. This port volume is 2.06 ft^3. Thus I only have 1.39 ft^3 of actual volume to use. Do I have this correct that the volume of a ported box is the stated volume + the port volume?

If this is true, it seems there is no way I can do 2 12's ported right?

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[itzme218 10+ year member]

Go look at RE's box calc site and plug numbers in

 

[ghart999 10+ year member]

I played with RE's calc. Very nice. Now according to that I can tune to 34Hz and fit a 3cf box with my dimensions. However, this calc does not consider port velocity at all.

Don't I need to worry about this?

 

[tez4life Premium Member]

Im not a expert on box design or tuning, but based on your dimensions, your still goin to end up with a box thats pretty small.

Are you dead set on ported for them? I would suggest sealed based on the limited space you have ava. Or, possible using areo ports to save some internal space if you must go ported.

Personally, with the RL-ps, I would not go higher than a 32hz tune, but thats just me //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[ghart999 10+ year member]

I am willing to go sealed. But if I can go ported around 32-34Hz with my space restrictions, I would prefer to.

 

[James Bang 5,000+ posts]

i'd never go with anything tuned higher than 32hz, but that's just me... each his own. blah blah

Rl-Ps sound great with about 1.75 cuft NET per sub.

See pic in sig

 

[mlstrass 5,000+ posts]

RL-P's do work well in smaller then normal boxes, but you won't like 34hz as I've tried it. 32Hz sounds good though. 44^2 of port would be fine for 3.5cubes...

 

[itzme218 10+ year member]

try 2.5" port and turn it to 32hz with dimensions you can fit, what net vol do you get?

tunning to 32 would actually be more like 33-34, and net vol would be a lil less due to displacement...

if you're able to squeeze each into 1.7 you should be good...to go ported.

 

[Hintzyboy 5,000+ posts]

just go with a large sealed box. You won't be able to properly port them, but you might be able to gain some more volume by running a box that's larger than spec

 

[Hintzyboy 5,000+ posts]

try 2.5" port and turn it to 32hz with dimensions you can fit, what net vol do you get?tunning to 32 would actually be more like 33-34, and net vol would be a lil less due to displacement...

if you're able to squeeze each into 1.7 you should be good...to go ported.

a 2.5" port for 2 12s??? Are you serious? you're asking for hella port noise there.

 

[ghart999 10+ year member]

just go with a large sealed box. You won't be able to properly port them, but you might be able to gain some more volume by running a box that's larger than spec

Yeah I think you're right. I will go sealed at like 1.5cf per sub.