Hi fhw,
You can get a singe QS-8 in maple if you wish. The price of one QS-8 is exactly half that of a pair.

I'm an enthusiast of quadpolar radiators in surround or rear-channel applications because of the seamless sense of envelopment they deliver without losing directional cues when called upon. Some HT enthusiasts do prefer monopolar speakers in the back channel, of course.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)