So I have Mtx Blue Thunder Pro 752 amp. Rated at 37W per channel. Hooked to one 10" sub in bridged mono mode supposedly producing 150W. Can I hook another 10" to this amp in mono mode, what power am I looking at running to each sub and what will be my ohm rating?

I got this amp super cheap off Ebay, amp + 10" Legend in MTX box for $90 shipped. Good deal? I feel I stole it but not sure?

Christopher