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The SoundTouch® SA-5 amplifier works with the following Bose indoor and outdoor speakers, as well as most other speakers. It can operate up to two pairs of speakers in parallel if you want to provide music to two rooms or power four speakers in a larger space. All attached speakers will work together as one SoundTouch® “zone.”

Indoor speakers Can operate one pair with SA-5 Can operate two pairs with SA-5 (in parallel)
161 speakers  Yes Yes
201® speakers  Yes Yes
301® speakers  Yes No
Acoustimass® 3 stereo system Yes No
Acoustimass® 5 stereo system Yes Yes
591 in-ceiling speakers Yes Yes
691 in-wall speakers Yes Yes
791 in-ceiling speakers Yes Yes
891 in-wall speakers Yes Yes
Outdoor speakers Can operate one pair with SA-5 Can operate two pairs with SA-5 (in parallel)
Free Space® 51 speakers Yes Yes
151® SE speakers Yes No
251® speakers Yes Yes