if this helps, i run my 1507 at 3ohms, works fine....its not recomended. however i asked my shop here in town, and buddy had seen the alpine's run at 2 ohm, they just get warm...good ventilation you should be good

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My Car Install...
HU - Eclipse 5435
Fronts - Diamond Audio 4" Hex's
MidBass - Image Dynamics 6"
EQ - PG eq215ix & PG Line Driver
Subs - 1 JL Audio 10w7 in H.O. Box
Amps - PG ZX450 & Alpine 1507