Would you recommend multiple ports are a large single port for 2 Q 18 D1s with cooling and the extra spider on an AudioQue AQ2200d, in 20 cubes after displacement tuned to 28 Hz? Car is a 2004 Tahoe with the max box dimension limits being about 27 H x 49.5 W x 36.5 D. I had a few designs floating around, I think one was with 4 8.5" round ports, one with two slots along the bottom of the box, and one was a rectangle in the center measuring 15.5 H x 19 W, so 294 in^2s area and was 22.35 in. long. The dimension limits leave about 7-9 inches between the box and the rear, 7 at the top and 9 at the bottom. I was thinking the large port might not have enough port speed, but hey no chuffing lol. Maybe I should try designing one large port across the bottom?

No goals = hard to help.

One thing is easy though, no one should recommend the AQ.

Sorry, made that post on my phone and was going to get more into the question as it progressed. I was kind of going for how multiple ports vs single ports, round vs slot, and different port areas affect SQ vs SPL and port speed. I should have probably put this under general technical and definately made it more clear. Just thought since it was an Fi product specifically it would be ok here. And this isn't really goal orientated, just to help myself, as well as others, to decide what design to incorporate.

Also, what's wrong with Audioque? Thought it had a pretty proven track record.

Proven by whom and for how long? Cheap parts and manufacturing. I have no interest in them.

As long as the port area is appropriate there is no advantage or disadvantage (generically speaking) of any shape.

Aeroports are generally better as they have more of a round on the edge and you can use less of them and get better tuning and what not...

There is no definitive answer for your question though, it comes down to what you figure out works best for your install...

We set guidelines..this is a "DIY" thing where you really "Do it yourself"...if you stick to those guidelines you shouldn't have issues. But if you are worrying about this for a daily driver and not a car that turns numbers you are really wasting your time

Ok thanks for the help guys. That's all I needed to know. I think I might try aero ports this time, see how it works out. Just for shits n giggles though, better numbers come from the massive port areas and large boxes right, at a low tuning frequency, generally. Dumb question, think I know what's coming.

Big numbers and low tuning frequency doesn't happen because your car is only so big. Low frequencies have larger wave forms...therefore the wave does not have time to 'form' in a car..because it's only 4 feet or so from where the cone of the sub is to the mic..

Big ports tuned low will move massive amounts of air with a ton of cone area and will do 'hair tricks' easily..

But to say that any one thing is always definitively louder then another...is simply foolish

I meant to say move more air, aghh I am not on top of my game today. I always liked that feeling, hair tricks were never a goal though lol.