Depends on your listening preferences, room size and associated gear. I would try them w/o the sub amp first and see how you like it. Some have gotten the sub amp and found it wasn't necessary for their needs. Other need and want the added effect. IMO, with the sub amp the Gallo's are competitive with some of the better full range speakers. But I will say depending on your associated gear, you may be suprised by the level of bass you can get w/o the sub amp. The Gallo's love current and get the impedance thing matched and your all set. I was consistently amazed at how they got better as the gear/system matching got better (as should be the case with a good gear.)
