Meyer Sound Self-Powered Loudspeaker Systems USM-P Series - Manual (Page 7)

A MPLIFIER N ATURAL C ONVECTION
C
OOLING
S
YSTEM
The USM-P employs a natural convection
cooling system that depends on air flow
from below the cabinet over the
heatsink. Allow for proper ventillation
of fresh air when using the speaker.
If the temperature of the heatsink
reaches 85°C (185°F), the On/Temp.
LED on the rear panel turns from green
(On) to red (Temp.) and the limiter
threshold is lowered to a safe level to
prevent the amplifiers from overheating.
Under high temperature conditions the
limiter threshold is reduced to 6 dB.
When the heatsink tmeperature decreas-
es to 75°C (167°F), the On/Temp. LED
changes from red to green and the lim-
iter threshold returns to normal.
The heatsink gets too hot to
touch during normal opera-
tion. Use extreme caution
near the rear of the cabinet.
F AN A SSEMBLY K IT
While convection cooling is adequate
for most applications, driving the USM-
P into frequent limiting under severe
temperature conditions, or where venti-
lation is restricted, an optional fan kit
is available to maintain a safe operat-
ing temperature. The easy-to-install
fan, powered by the 24V Fan user panel
connector, blows air directly onto the
heatsink. The fan speed increases as the
heatsink temperature rises, which main-
tains a safe operating temperature with
minimal fan noise. Contact Meyer Sound
to order the fan kit.
P OWER S UPPLY F AN
The power supply is cooled by a single small
internal fan that turns on low when the unit
is first powered up. The fan doubles its speed
as the system is driven with audio. Since the
fan draws air in from, and exhausts it out the
side of the cabinet, there must be at least six
inches on the amplifier's side of the cabinet
and adequate air flow.
7
USM-1P (Side View)
!
COVERAGE
The Constant Q design of the horn allows
frequencies outside of the coverage area
of the speaker to attenuate quickly. This
is excellent for monitoring where several
different monitors are used in close
proximity. When placing the monitor
carefully consider the coverage pattern
of the USM-P and USM-100P. The USM-1P's coverage area is:
-6 dB points: 45° H x 45° V
-10 dB points: 65° H x 65° V
The USM-100P's coverage area is:
-6 dB points: 100° H x 40° V
-10 dB points: 120° H x 60° V
USM-1P (Top View)
USM-1P (Front View)
USM-100P (Side View)
USM-100P (Top View)
USM-1P (Top View)
The following drawings illustrate the coverage area of each horn from three different
perspectives in order to depict the three dimensional coverage pattern.