Hi. Current system is a Marantz 7701 pre amp, a Marantz MM7055 5 channel amp. Current speakers are all Klipsch, RF-7 II mains, RC-64 II center, RS-52 II surrounds. Sub is a HSU VTF-15H MK2. Considering adding a 2 channel amp to go from a 5.1 to a 7.1 set up. Cost about 1000-1400. Room is 24x24. Will additional sound justifie cost? Another option considering is stay with the 5.1 system and upgrade surround speakers to the RS-62II's. Or just run with what I have. Opinions?