PRECAUTION
Ventilation
Placement Considerations
For your protection, review “Important Safety Instructions” and “Operating Voltage” before you install your Nº33.
Your Mark Levinson Nº33 power amplifiers are specifically designed to stand on the floor, and must be used as freestanding units. In most installations, locating them near the loudspeakers is best. Obviously, this approach minimizes the length of the speaker wires and necessitates longer interconnecting cables from the preamplifier to the power amplifiers. The advantage to this strategy lies in the fact that the interconnecting cables carry
Note that adequate clearance for the AC cord and connecting signal cables must be left behind each Nº33. We suggest leaving at least six inches (15 cm) of free space behind each Nº33 so that all cables have sufficient room to bend without crimping or undue strain.
Each amplifier should also be placed in such a way that the power switch on the rear panel is easily accessible. This switch disconnects power from even the su- pervisory power supply, resulting in effective disconnection of the amplifier from the AC mains. (Note that under these conditions, the amplifier cannot respond to
Your Mark Levinson Nº33 power amplifiers have been designed to complement your listening room visually, with a tall and narrow frontal area which reduces their effective “footprint” and makes them far more presentable than would be the case with a more traditionally proportioned design. As a result, they can be more easily placed beside your loudspeakers. As freestanding units, the Nº33 am- plifiers normally will have no problem with ventilation.
Each of your Nº33 power amplifiers dissipate approximately 800 watts of energy as heat when “at idle.” It is therefore normal and perfectly safe for them to run warm. They do, however, require free air flow around them to allow adequate heat dissipation through air circulation. The top plate and heatsinks of the Nº33 must be kept free from any obstruction which would reduce the free flow of air.
If your amplifier must be located inside an enclosure of some sort that restricts airflow, we strongly advise using some fans to increase ventilation through the enclosed space. If the amplifiers become too warm to touch, they are receiving inadequate ventilation. While they are fully protected against overheating, no one enjoys interrupted listening sessions.
Mechanical drawings are included in this manual to facilitate special installations and custom enclosures where necessary (see “Dimensions” at the end of this manual).
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