What is the best speaker for a smallish room?

I currently have a wonderful EAR 890 power amp, a Klyne SK-6 pre-amp and a pair of Piquet modified Quads. It's a great combination but I'll probably need to relocate to a smaller room -- 11 x 15 or so. I am thinking about substituting the Quads with another great speaker. The quads are just great, although they move less air than I would like them to. I thought about a pair of Sonus Faber Extrema, but I believe they like large rooms. I am open to a bi-amplification solution. Thanks.