Based on the volume you identified - I'd be looking at a pair of GB12s but you have more power than they would ever need - probs would be best to wire them at 4 ohms with your current amp.
Morel Ultimo 12Ti and Illusion C12XLs are going to be very musical but want more air than you have. Raven 12XLs are in this boat too but seem to model a bit better with less air than the 12XL or the Ultimos.
Also not sure if you are trying to stay front firing or down/up firing as that obviously limits subwoofer diameter.
Morel Ultimo 12Ti and Illusion C12XLs are going to be very musical but want more air than you have. Raven 12XLs are in this boat too but seem to model a bit better with less air than the 12XL or the Ultimos.
Also not sure if you are trying to stay front firing or down/up firing as that obviously limits subwoofer diameter.