I am deciding on going with 3 15s or 2 18s, since the SD is almost equal. Obviously I am leaning towards the 18s, I can save money and won't have a funky ohm load. But my issue is the airspace, minimum on the 15s is 2 cubes, so 3 would be 6 cubes. But minimum on the 18s is 4 cubes and ranges up 8, while the 15s only range up to 2.6. So realisitcly which would be a better way to go? I am using a Sundown 3000 for power and I do not have a TON of space to work with.

With that power, I would recommend the 3 15's. They would have 530 sq. in. of cone area, while the 18's would have 509 sq. in. of cone area.

With 3 15s what ohm loads do I get? I'm not good with funky numbers like that lol.

Get D2 ohm subs and it would be a 1.34 ohm load.

Now what if the box is a little small for the Qs, how will that affect the sound? Is it like the same as ported where it will loose efficiency? (No experience with sealed boxes)

Edited October 6, 200816 yr by The727Kid

You won't really notice a difference if it is a little small.