I own 3 different Bose SoundTouch Speakers and amp. The SoundTouch 10 is plenty loud enough for my wife's office. She says she never turn it up past 1/4 of the way up. Our SoundTouch 20 is in our kitchen area which is about 14 feet by 20 feet and it never goes past 1/4 volume because past that it gets too loud. Finally, we replaced our whole house audio system (which includes the Living room, Famlily Room, Master Bedroom and Master Bathroom) with Bose SoundTouch SA-5 amps. SA-5 can really pump up the volume on in-ceiling speakers (some Bose and some SoundCraft Speakers).