Never heard of Vifa, i would suggest Focal Utopia in custom kick panels. JL's new component set would also be a great choice
It's unfortunate that some of the world's best drivers are known only to speaker manufacturers and not end-users (or customers)
If you are willing to pay big bucks for Focal component sets I suggest looking into the Seas Lotus reference drivers and Audax HDA units.
I not go with memphis on this, the JBL 1200.1 $269 is a much better choice
the BP1200.1 is a good subwoofer (1 channel) amplifer. But what are you going to use to drive your front speakers?
The Memphis Belle is a superb 4 channel amp. Enough power to drive your subwoofer AND component fronts. 75W x 4 (4ohm), 10Hz-50Khz at 0.03% THD.
And don't take my word (or specs) for it- listen to it in action.
Little wonder it won a CES 2001 Innovations award.
Very good choice in subs, except i would use two so you can wire the JBL down to 2ohms and effectively give the shiva 600 rms
One Shiva, driven by a good amplifier will give thunderous amounts of bass. Unless you're entering SPL competitions do you really need more than one 12" subwoofer? (an especially a Shiva!?) To most people 2 Shivas will be overkill.. And it's not very practical- some people like to have a _little_ boot space left over.
Wow, 300 dollars for a box, No way, you can eaisly build you own for no more than 40bux.
I don't think $300 for kickboxes, subwoofer boxes and other install costs is too much. In car audio a good install makes ALL the difference. I've seen people wack a perfectly good subwoofer into any ol' box, cut a hole in it and then complain that it doesn't perform as well as it should
("Hmmm, think I'll buy another 12 inch").
Unfortunately many car stereo buffs think a subwoofer box is just protective housing for the driver. This couldn't be further from the truth.
It's detrimental to skimp on the cabinet design and construction materials.