after my last system im a firm believer now that amp and power source have more to do with a good sounding sub than the sub. it was my first jl system and i will be goin back, stick with a the jl amp and there RIPS regulated power control and a decent subs/airspace and i think you would be in good shape. but yea sorry i got no exp with shallow subs yet, besides hearing the tw5 is kickass like mentioned many times before

 

i have 2 S-class memphises, they sound just like the M if not better, and don't need anywhere near the space!

 

No better words ever spoken....good clean power and you can damn near double the power the subs are rated for. I have done that so many times. My car stero guy measured today and I have 1.5 cubes behind the seat. So that pretty much means only 2 12s in their recommended airspace unless I do a blow through which I don't want to.