How many pair of speakers do you own?

5 pairs.
3 pairs for 3 different systems and 2 pairs attached to the same system (both connected to the same source and amplifier, in different locations - one pair is right in front of the sofa for movies and near field listening, the other pair is along the perpendicular wall for a complete room filling and loud listening).
All of them in different rooms.

Computer (2)
Living room (1)
Family room (1)
Workshop (2), sometimes 3 if I'm messing around.
Race car hauler (1)
All are just stereo, except for one of the computer systems that has a sub.

Currently three, my main listening room are Revel M106, in  my workshop are some vintage KLH Model 2 Computer Controlled speakers which still sound pretty good, and some Boston CR 7 in my garage.    

Revel Salon 2
Vienna Acoustics Beethoven
Kef R107/2
Epicure Model 3
Revel voice1
 The Salon  2 is really all one could ask for while proper setup is critical, the Beethovens are a steal for the money and I really like what they do. The speakers to touch the soul of the listener Kef R107/2 still have world class bass and serve front mains in my 3 channel ht.My Ultima voice, all 72 lbs of it take up most of my tv stand but are worth it. The epicure model 3 have a hot tweeter that makes everything I play exciting, they're currently waiting for me to clean the garage.