Someone's probably going to tell me that this is a bad idea, but...

[3LB]

In order to get decent quality bass out of a system, 60-80% of total system power will be dedicated to sub-bass. The lower you can x-over a sub the easier it is to integrate it, and that will require that you have enough power to hear a sub that's x'd over that low, and a subwoofer that will reproduce that low frequency.

[Ged]

I agree with that. If I were to use the head unit alone, the sub would be getting about 50%. I understand that's not great, but I don't think it's all bad either if I can match the driver to the power source.

My 5yo daughter wants to send you guys some smilies.