Install for conv

I have a convertible with limited space. I can do 1 jl 12w0 at correct sealed vol.1.50cu ft,  or 2.07 cu ft with a slot port. I have been 2 many local shops and no one seems to agree. example, sealed firing to the back, port to the back, port firing down.....I understand that a slot port offers a 3db increase and better tuning, but do I lose that adv by not having the required vol. I have done some calc and my woofer can be sealed or ported, however, with a 51 it's a lot closer to the sealed box. Any suggestions on a conv?

I would tend toward ported in a conv.  It has more road noise and less sheet metal, so less cabin gain.  If you can fire both the cone and the port toward a cavity area, you should get the most cabin gain.  And go with the port type that your volume capacity will allow.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

thanks for the reply. Does any one have any additional Ideas?

I gotta go with the above recomendation, sounds like about your best betdouble-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

i personally like the sealed box facing backwards.  ive never really like ported boxes.  plus with a convertible youre probably limited on your space so a sealed enclosure would be easier to fit in there. 

What is the vehicle?Top Secret, I can tell you but then my wife will kill me.

it is a BMW 325

Well. it appears that I am in the same postion as before. I appreciate everyone's input, please let me know if you have additional ideas. As for know, I think that my options are to do a sealed 1.50 ft3 fireing down or 2.07 ft3 ported with filler. How much or what would be the equivilent will the filler make. example( if I have 2.07 ft3 and add filler will that be the same as a 2.25ft3 box)?

I suggest for a ported box to have actual air space per specs, and not rely on polyfil to make the difference.  A sealed box is more forgiving.  Can't tweak out another .2 ft3?  And my recommendation stands as I stated above for your car.  Adding fill after that is your choice, put it in and try it, take it out if you wish.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.