350 RMS a sub? or 350 in all?
350 watts RMS will produce some nice bass it would be considered a first timer system though but you will deffinatly be happy with the production of bass for months to come!
Honestly... you Should just email me, because i still lack alot of the statistics nessecary to give you a full answer.
It depends what the subs are rated for and how many ohms you will be running the amp at and what type of box you are using. But more than likely it should be pretty loud