I have plans to make a home theatre system. I will be using the Panasonic XR50 Receiver (100WPC). Since the sub that i will use is a Lightning Audio p2.10.4, I don't plan to take it up past about 100W RMS. Do i need an amp, or can i run it direct from the receiver? Oh, and if i use a 100W receiver with a 70W amp (if i need to), how will it go higher than 170 W? This is so confusing.