Meyer Sound UPA-1C User manual
UP
A-1C
UltraSeries™
Loudspeaker
Designed for a wide variety of sound
reinforcement applications, the compact,
arrayable UPA-1C allows for controlled
coverage of wide areas in theater, club and
concert sound reinforcement. The powerful
loudspeaker delivers high sound pressure
levels with extremely low distortion, for
maximum intelligibility and fidelity.
The biamplified loudspeaker consists of
a␣proprietary 12-inch low-frequency cone
driver in a vented enclosure with an 80-
degree high-frequency horn and driver.
The rugged, multiple-ply hardwood
cabinet enclosure is fitted with handles
and, optionally, aircraft-style rigging pan
fittings or threaded nut plates.
The UPA-1C requires a high-quality
professional stereo power amplifier capable
of delivering 250 watts/channel continu-
ously into 8 ohms, with a signal voltage
gain of 20␣dB (minimum) to 30 dB (maxi-
mum).
Features
Efficient high power
Ultra-low distortion
Compact and versatile
High clarity and coherence
Arrayable
Rugged
Long-term reliability
Applications
Music playback in discos
Sound reinforcement
Live music clubs
Side fill in concert reinforcement
Theater PA systems
High-power announcing
Paging indoors/outdoors
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(510) 486-1166
FAX (510) 486-8356
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Inches
Note 1:
Measured 1 meter from center
of cabinet face, half-space
conditions, pink noise input,
network set to FLT, smoothed
to one-third octave. Low
frequency response
dependent on load conditions.
Note 2:
Loudspeaker driven with pink
noise.
Note 3:
“A”- weighted, unbalanced.
Acoustical – UPA-1C/M-1A System
Frequency Response
1
80 to 18,000 Hz +4 dB
-6 dB at 60 Hz and 20 kHz
Maximum SPL
2
with amplifier rated at: 250 W/8 ohms/ch 60 W/8 ohms/ch
Continuous 125 dB 120 dB
Peak 132 dB 125 dB
HF Coverage
Horizontal 80 degrees
Vertical 60 degrees
UPA-1C Loudspeaker
Transducers
Low Frequency MS-12 12-inch cone driver, 8 ohms
High Frequency MS-1401B 1.4-inch throat driver, 16 ohms
High Frequency Horn Modified radial with foam lens
HF Network Y-1PD
Function DC blocking and damped band-elimination filter
Enclosure 0.8 cu. ft. vented, multi-ply Finnish birch plywood
Finish Black textured, weather protected (optional)
Protective Grill Perforated steel screen, charcoal-grey foam covering
Connector EP-4 male (EP-5 male, Europe only)
Rigging Aircraft pan fittings, or
3
⁄8"-16 or M10 x 1.5 nut plate
Physical Dimensions 14
1
⁄2" W x 22
3
⁄8" H x 14
1
⁄2" D
Weight 67 lbs. (30 kg)
M-1A Control Electronics Unit
Input Type Balanced (active), 47K ohms
Output Type Active push-pull, will drive 600 ohms
Maximum Input/Output Level
Balanced +26 dBu
Unbalanced +20 dBu
Hum and Noise
3
-90 dBV
Dynamic Range 120 dB
Sense Inputs 10k ohms true differential, opto-isolated
Crossover Frequency 1600 Hz
Low Frequency Delay Type Active all-pass
Driver Protection Circuitry
Low Frequency RMS limiter
High Frequency RMS limiter
VHF Peak limiter
Indicators
Sense; Hi and Lo Green LEDs
Limit; Hi, Lo, and VHF Red LEDs
Safe Green LED
Power Supply, Positive and Negative Green LEDs
Controls
Front Panel Input level control, AC on/off switch
Preset Panel VHF control, Lo Cut switch, Safe switch and VHF switch
Connectors
Balanced Inputs/Outputs 3-pin XLR (A-3), RTS
1
⁄4" phone jacks
Subwoofer Circuit Input Unbalanced,
1
⁄4" phone jack (inserts Lo Cut,
disables Level control)
Sense Inputs Banana jacks
UPA-1C Specifications
Power 120/240V AC, 50/60 Hz (internally switchable)
Physical Dimensions 19" W x 1
3
⁄4" H x 7
3
⁄4" D Standard rack mount
Weight 8 lbs. (3.6 kg)
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.
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.
7.67"
15
2.63"
7.50"
12.75"
14.50"
1.75"
14.50"
22.38"
13.31"
o
10.25"
7.0"
M-1A Control Electronics Unit
Physical Dimensions
UltraSeries™ M-1A Power
Sense Limit
Safe
Adj
Lo Cut
Cal
VHF
Var
Safe
∞
20
10 843
2
1
0
Attn dB
5
6
+ -
Lo
Hi
VHF
Meyer Sound Laboratories has
devoted itself to designing,
manufacturing, and refining
components that deliver superb
sonic reproduction. Every part of
every component is designed and
built to exacting specifications and
undergoes rigorous, comprehen-
sive testing in the laboratories.
Research remains an integral,
driving force behind all
production. Meyer strives for
sound quality that is predictable
and neutral over an extended
lifetime and across an extended
range.
Sound
engineering
for the art
and science
of sound.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
(
510
) 486-1166
FAX (
510
) 486-8356
Architectural and
Engineering Specifications
The compact sound reinforcement
speaker system shall be a two-way type
with a 12" low-frequency loudspeaker front-
mounted in a ducted bass-reflex hardwood
plywood enclosure with a compression
driver mounted on a high-frequency horn
which has a 1.4" throat, and a separate
Control Electronics Unit.
The Control Electronics Unit shall
contain a power supply capable of opera-
ting from a 120/240V AC, 50/60 Hz line,
electronic crossover circuitry, electronic
delay for the phase alignment of the
low-frequency speaker, low- and high-
frequency sliding filters which automati-
cally activate under high power conditions,
RMS limiters which protect the speakers
from over-heating, equalization circuitry,
active balanced input, indicator LED’s
for power on and limiters. Total harmonic
distortion shall be less than .1%. “A”-
weighted noise level shall be at least 110 dB
below maximum rated output of +26 dBu.
The speaker system, its companion
Control Electronics Unit, and a power
amplifier rated at 250 watts/channel into
8 ohms shall meet the following perfor-
mance criteria: Frequency response, 80 Hz
to 18 kHz plus or minus 4 dB measured
with
1
⁄
3
octave pink noise, 1 meter on axis;
output of 125 dB SPL measured 1 meter
on axis with peaks of 132 dB SPL driven
with “A”-weighted noise. Total harmonic
distortion shall be less than 1% at 110 dB
SPL and 3% at 120 dB SPL one meter on
axis. Distribution pattern, 80 degrees
horizontal by 60 degrees vertical.
Speaker dimensions shall be 14
1
⁄
2
" W x
22
3
⁄
8
" H x 14
1
⁄
2
" D, weight 67 lbs (30 kg).
Control Electronics Unit dimensions
shall be 19" W x 1
3
⁄
4
" H x 7
3
⁄
4
" D, weight
8␣lbs (3.6 kg).
The speaker system shall be the Meyer
Sound UPA-1C. The Control Electronics
Unit shall be the Meyer Sound M-1A.
© 1994 Meyer Sound 04052042.03 A2
UPA-1C/M-1A
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