Klipsch SD

Hi Guys, Currently i have Klipsch Reference series 5.1 setup with Denon AVR 2300. Mains R26F Centre RC25 Surround R14S Sub R10SW Am planning to make it 7.1 setup by adding Quintet-ii pair of speakers as rear surround. Due to space constraints i cant place bookshelf in rear. Will Quintet-ii pair match as rear surround with my existing reference series ? Comparing its size with other speakers will it sound good ? Pls advice me. Thanks