Hello, Currently, I've got a pair of Yamaha NS B750 bookshelf speakers hooked up to a Yamaha 803D Stereo Receiver. I'm going to get a subwoofer for them (most probably the SW700 from yamaha since it's the same series and fits well visually and tonally) - however, my dealer told me he's can give me a great deal (very small money difference) if I want to return the B750s and exchange them for a pair of NS-F700 (Basically the tower variant, has an extra large woofer per channel that goes all the way down to 45hz, whereas the B750 go to 60hz). I'm very tempted to do that, but I don't know if it's REALLY worth it considering I'm getting a sub anyway, and that the receiver (through yamaha's YPAO calibration) will manage the crossover (generally it will send about above 100hz to the speakers and let the sub deal with the rest). Is there ANY benefit in getting the tower speakers (considering they're basically the same with added bass driver) ? Will I get an audio improvement or will the receiver simply bypass the low frequencies altogether on the tower and basically render the bottom driver useless, "transforming" the F700 into the B750 (2 way speaker) and the bass will be handled by the sub entirely? thanks!