Installation
Mechanical considerations
The Stewart Audio DA-70 Series amplifier occupies just one-half standard
rack space, is only 10.6” deep and weighs just over 3 pounds, making it
easier to install and transport than almost any other comparable power
amplifier. Still some precautions are in order.
Rack mounting of the DA-70 Series may be achieved by using either the
Stewart Audio RMK-70-S or RMK-70-D rack kits. The RMK-70-S centers the
amplifier in a single rack space, while the RMK-70-D allows you to rack two
amps side by side in a single rack space. For stability always use four screws
to affix the amplifier to the rack, preferably using rack washers to avoid
cosmetic damage to the rack mount panels. When rack mounting your
DA-70 Series amplifiers be sure to remove the four adhesive rubber feet
from the bottom of the unit. The DA-70 Series amplifiers can also be
mounted to a standard rack shelf or used as a stand alone product.
Thermal Considerations
Cooling of the DA-70 Series amplifiers is achieved by Stewart’s unique whole
chassis heatsink design, which utilizes the entire chassis as a heatsink to
cool the heat generating components inside. In the event the internal
ambient temperature reaches 85 degrees centigrade, the protection circuit
will shut down the power supply until the amplifier cools down.
Although the sophisticated thermal management system in the DA-70 Series
makes it less susceptible to overheating than other amplifiers, it remains
good practice to provide airspace around the chassis.
NOTE: A –4 model (4 channel) amplifier will dissipate twice the heat of a
–2 model (2 channel) amplifier and a PFC model will dissipate approximately
10% more heat than a non PFC model Therefore while a DA-70-2 runs very
cool, the DA-70-4-PFC will require a little more attention to cooling.
Multiple amplifiers can be racked on top of one another without leaving a full
rack space between them as long as sufficient airflow is maintained to allow
heat to escape out the top.
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