I've often felt that the Bose 901s would make good surrounds, especially with analog Dolby ProLogic, or if you can't go with 7.1. Properly set up they should definitely fill in the back half of the room. With digital you'd definitely want to use the active equalizer to get some treble.
However, time does march on. These days, for a small unobtrusive surround with room-filling hemispherical dispersion and a light, airy treble, I much prefer the Mirage Omnisat satellites, or OMD-5s.
However, time does march on. These days, for a small unobtrusive surround with room-filling hemispherical dispersion and a light, airy treble, I much prefer the Mirage Omnisat satellites, or OMD-5s.