Avalon Acoustics Sentinel - Manual (Page 10)

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2.1 Room Preparation and Verification
The Sentinel Active Reference System weighs over 1,100 pounds (about 520
kg). It is therefore crucial to verify the soundness of the intended listening
room floor structure and to insure that the structure can safely support the
device. If the listening room is not located on the ground floor, and/or if the
floor structure is suspended, it is recommended that you consult a structural
engineer for assistance.
WARNING: The Sentinel Active Reference System weighs over 1,100 pounds
(approximately 520 kg). You MUST evaluate and verify the integrity of the
intended listening room floor structure before bringing the crates into the
home.
The Sentinel is a full-range frequency device capable of accurately
reproducing the deep bass of a pipe organ or large bass drum. Any loose
items within the listening room (such as picture frames, light fixtures, drapery
controls, etc.) can easily become excited and resonate when the transducer
reproduces these very low frequencies. In order to avoid these vibration
effects, care should be taken to secure loose items or remove them from the
listening environment.