"tls49... going to listen at higher levels and will see how many lights illuminate. I was at only 10 o'clock volume the other night and 4 of the lights lit up."
If you listen at levels that cause that 5th light to illuminate frequently, then that is extremely close to the maximum capability of your system. It has nothing to do with the position of the volume control. Also, I'm thinking you should only consider speakers with a sensitivity above 90db unless you plan to replace the 3020 with a higher wattage amp. A 92db speaker would require 40 watts to have the same capability as your Klipsch/3020 combo, a 89db speaker would require 80 watts, and a 86db speaker would require 160 watts. Every 3db is a double or a half of power depending on the direction you're going.