You have more control over the LFE signal, via the receiver, if you split the sub output to the towers in conjunction with the speaker connections (no sub). With a sub, just connect it to the sub out and run speaker connections only to the towers. A Denon 2808 would be a great receiver option. I would only consider the DT SuperCube I or better from their subs. But as others have said, it is wise to SAVE UP FOR A BETTER SUB, than to rely on your brother’s discount.