As Sarah is saying, the REL connects to the speaker terminals on your amp. So they receive the same signal as your N804s and will integrate perfectly. You will not know the sub is there until you turn it off. Many subs have a crossover that cut off and replace the low bass from your main speakers. RELs are designed to let your main speakers run full range as before. They fill in the bottom below what your main speakers can produce. So if you like the sound of your N804s and your system as a whole, this is a perfect way to add what is missing. RELs are not boom boxes. They are as tuneful as your main speakers. And yes, when I said two subs above, I did mean one for each channel.
