if you had 2 4ohm speakers and hooked them up they would be sharing 300 watts at 2 ohms. so each sub would get 150watts at 4ohms. when you bridge an amp the resistance halves and the wattage usually doubles so long as the amp can run that low of a load. i'd go with the jl's if it was my money, check on the net for them and you can most likely get a good deal. and i think the jl's are rated at around 125 watts or so, which would be a nice combo. most subs blow from underpowering not overpowering.