Changed my plans of cutting up my front seat for a center console. Going with 2 8s now ported hopefully with careful planning and box design.
I need opinions on 8s tho. Heres what I've been looking at:

SA8
Pros: High SPL, high power handling (500W RMS), only need .5 ft^3 ported
Cons: 5.5" mounting depth, Large port area necessary

Tang Band W8-740P
Pros: 4.75" mounting depth, Highly regarded for sound quality
Cons: Not as loud, less power handling (150W RMS)
Similar to above:
Tang Band W8-1363SB
Pros: 4.75" mounting depth, Neodymium motor, Lighter
Cons: again not as loud, even less power handling (120W RMS)
Both model well in a .5 ft^3 each with smaller port area required

SoundSplinter Orphan 8
Pros: Loud, Ability to play low, TC2 based, High power handling, Model well in small enclosures ported
Cons: Not sure on mounting depth, More expensive

Budget of around $150 per sub. Any help would be appreciated

 

mSall? Anyone?

 

SA8's will be the loudest, but the Orphan will probably sound better all around. The orphan mounting depth is 5.65", from what i hear the orphans take good amount of power to.. I haven't followed your post, but do you plan to put these under the rear seat? I also don't think those Tang Bands will get loud at all..

 

Ya I am going to go under the seat now. I think I am going to go with 2 SA-8s with an Audiopipe AP15001D amp. Doing more research into the orphans, I found out they like passive radiators more than ports so that swayed my decision to go with 2 SA-8s. Hopefully I can get the mounting depth I need with 3/4" MDF. If not I'll try a minor seat lift. If that doesn't work, I think I'm gonna go with some fiberglass.