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PLACEMENT GUIDELINES FOR YOUR A 21
Power ampliers are usually heavier and generate more heat than other components. To avoid
damage to the A 21 or other equipment and to reduce risk of re, you must follow these
guidelines:
• Place the A 21 on a separate shelf that will adequately support its weight.
• Keep it away from heat sources such as air ducts or radiators.
• Avoid placing it on carpeting or another material that might obstruct airow into the openings
in the chassis bottom.
• Leave at least 3” of space around both sides and 6” of space above the top. The bottom
clearance can be a little less.
• Do not block the front of the A 21 behind closed cabinet doors during use.
• Do not stack the A 21 with other components inside a cabinet unless you use a fan to circulate
and exhaust the warm air that builds up between them.
Rack Mounting Your Parasound A 21
To mount the A 21 into a 19” wide equipment rack, you must rst attach its rack mount brackets
(provided). With its four feet removed, the A 21 chassis and front panel height occupies four rack
spaces (7” or 176 mm). When mounting equipment below the A 21, you will also need to allow
about 1/8” below the unit for the bottom chassis screws. A single standard rack space allows
1-3/4” vertical height in a 19" wide equipment rack. This measurement standard was developed
by the EIA (Electronic Industries Association) so manufacturers of electronic components and
equipment racks could build products in standardized heights that would t in a uniform space.
Please call your Parasound dealer or Parasound Technical Services if you need additional advice
about rack mounting the A 21.
To attach the rack mount brackets:
• Remove the three screws from each side of the A 21. These are arranged vertically, behind its
front panel and in front of its rst heatsink n.
• Line up the three holes on each bracket with the three holes on the A 21 and reinsert
the screws.
• Make sure the screws are tight because they will support the entire weight of the A 21 in the
equipment rack
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HRA-4 Rack Adapter Mounted on JC 1
Rack Mount Brackets Attached to A 21