If you have the Kenwood 6070 or 7070 or higher models, then preamps are there. I have the 6070 and use the 7070, the difference was not that the kenwood did not play my setup loud, just that the 770 played them loud with much much more clarity and extension, especially in the lower end range of my speakers capabilities. The benefit of the 200W per channel is knowing that you are getting full current extension driving a full range flat response to your speakers and the only variance being the music itself, not the limits of your electronics or speakers. That is how I would describe my ideal set up.