M-1A Control Electronics Unit; Physical Dimensions - Meyer Sound UPA-1C Specifications

Power

Physical Dimensions

Weight

M-1A Control Electronics Unit

+ -
Power
UltraSeries™ M-1A
The UPA-1C loudspeaker operates as a system with
the M-1A Control Electronics Unit (one per channel).
Optimized for the UPA-1C and UM-1C UltraMonitor™
and pre-aligned at the factory, the M-1A contains
frequency response and phase response alignment
circuitry, and Meyer Sound's exclusive SpeakerSense
driver protection circuitry, incorporating both peak and
RMS signal limiting.
A single-channel device operating at line level, the
M-1A is intended to be the final component in the signal
chain before the power amplifier. Its factory-calibrated
SpeakerSense circuitry protects the UPA-1C loudspeaker
components from damage due to overheating under
high power conditions. This unique circuit continuously
monitors the power applied to the UPA-1C drivers, and
individually limits the high-frequency and low-fre-
quency outputs when the safe operating limits of the
drivers are exceeded. Until the onset of overload, the
Speaker-Sense circuitry has no effect on the signal.
Physical Dimensions
120/240V AC, 50/60 Hz (internally switchable)
3
19" W x 1 ⁄
4
8 lbs. (3.6 kg)
VHF
Safe
Hi
Lo
Sense Limit
™
3
" H x 7 ⁄ " D Standard rack mount
4
Var
VHF
Cal Adj
Also provided is a switch-selectable Safe function,
which widens the safety margin of the system and is
intended to be used when extended periods of overload
are anticipated. The Safe switch and other setup controls
are located behind a cover plate on the M-1A front panel,
providing a means of securing the system installer's
presets.
To enhance the effectiveness of the UPA-1C, the M-1A
incorporates sliding filters which band-limit the system
response under full-power conditions. This has the effect
of discriminating for vocal information in the signal to
increase clarity, and is particularly useful when sound
pressure levels are high and leakage becomes a problem.
For this reason, it is recommended that subwoofers be
used with the system if it must pass the full audio fre-
quency range at all times. The preferred choice of
subwoofer for the UPA-1C is the Meyer Sound USW-1.
o
15
2.63"
7.50"
14.50"
22.38"
8
10
Lo Cut
20
Safe
Attn dB
12.75"
14.50"
1.75"
7.0"
10.25"
13.31"
6
5
4
3
2
1
0
7.67"