My main concerns when designing an audio setup are to decide:
1). how much space can/will I give up for a box/amp rack (1 x 12 inch sub = 2+ cubes plus port displacement, 2 x 12 inch, or 1 x 15 inch sub = 4+ cubes plus port displacement, etc)
2). how much power can/will I run (If budget is low, definitely keep the power below like 1000 watts or so, lest you need an expensive high output alternator. 2 x 500 watt 12s? 1 x 800-1000 watt 12?, 3 x 300 watt 10s?, etc)
3). Pick sub(s) based on the above 2 answers
1). how much space can/will I give up for a box/amp rack (1 x 12 inch sub = 2+ cubes plus port displacement, 2 x 12 inch, or 1 x 15 inch sub = 4+ cubes plus port displacement, etc)
2). how much power can/will I run (If budget is low, definitely keep the power below like 1000 watts or so, lest you need an expensive high output alternator. 2 x 500 watt 12s? 1 x 800-1000 watt 12?, 3 x 300 watt 10s?, etc)
3). Pick sub(s) based on the above 2 answers