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cramped control rooms typically found in smaller studios; any fan noise
would interfere with the mixing or monitoring process. The RA-100 should
be installed so that its heat sinking is allowed to do its job. Please observe the
following:
• The RA-100 is designed to perform properly over a range of ambient
temperatures from 0° C to +50° C (32° F to 122° F), in up to 80% non-
condensing humidity. These are not absolute limits, but Alesis cannot
guarantee that the RA-100 will meet its published specs if operated outside
of these ranges. If necessary, use a fan to blow air over the RA-100 and
promote cooler operation.
• Prevent the side heat sink fins from becoming obstructed. There should be
enough airspace around the amplifier for it to "breathe."
• Always allow adequate ventilation behind the RA-100. Do not seal any
enclosure that holds the RA-100.
• Never throw a coat or other flexible fabric or covering over the top of the
amp when it's in use.
• You may wish to leave an empty rack space above or below the amp to
promote good air flow.
• Due to the RA-100's weight (13.5 lbs.), it's a good idea to mount it in the
bottom of the rack frame.
Mounting on a Shelf or in a Non-Rack Enclosure
To mount the amplifier on a shelf or other flat surface, Alesis recommends
using the enclosed stick-on feet to avoid scratching the shelf's surface with the
amplifier bottom. To properly mount the stick-on feet:
1 Place the amplifier upside down on a clean cloth or piece of cardboard so
the amp top does not scratch your work surface.
2 Clean the bottom of the amp where you plan to stick the feet. Isopropyl
alcohol is recommended as a cleaning agent. This step insures that no
small amounts of oil or other substances will inhibit proper adhesion of
the feet.
3 When the surface has dried, attach the feet.
Please observe the comments on thermal considerations given under
"Thermal Considerations in Rack Mounting" no matter where or how the
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