Help an old man out

[f.monroe]

My son has an amp with the following specs. He had a pair of 15 inch Kicker subs that were way too big for his truck so I bought him an under seat down firing sealed box for 10 inch subs so he could reinstall his back seat. I partially understand the series/ parallel wiring and would like a suggestion on a good sub and wether we should bridge the amp or not. Is there a reason to bridge it when the specs at 2 ohms per channel seem to show the same output as a bridged load?

The box is .74 cu ft per side

I think he should be looking for a dual 4 ohm voice coil. To take advantage of the dual 2 ohm channels but his buddies say we need to bridge the amp for max output. Is there a difference in output?

Here are the specs on his amp. It just a cheaper amp he got from his cousin.
Audio phonics ADF-2842

4 ohms: 100 watts x 2 chan.
2 ohms: 150 watts x 2 chan.
Bridged, 4 ohms: 300 watts x 1 chan.
Max output 600 watts x 2

I would appreciate any help here.
Frank
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