UPM-2
Reinforcement
Loudspeaker
Operating Instructions
The Meyer Sound UPM-2 is an ultra compact, highpowered loudspeaker designed for sound reinforcement applications where minimum loudspeaker size
is desired. The system consists of two 5-inch lowfrequency cone drivers in a vented enclosure with a
constant-directivity high-frequency horn and 1" titanium dome driver. The enclosure contains a 3-way
passive crossover and is fitted with 3⁄8"-16 threaded
mounting points on both sides and at each end. An
optional steel mounting bracket is available.
The UPM-2 is designed to operate as a system with
the Meyer Sound P-2 Control Electronics Unit. The
P-2 contains frequency response alignment circuitry
optimized for the UPM-2, and Meyer Sound exclusive
SpeakerSense™ driver protection circuitry, incorporating both peak and RMS signal limiting.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
UPM-2
Reinforcement
Loudspeaker
Operating Instructions
Amplifier Requirements The UPM-2 requires a professional quality amplifier rated
at least 125 watts per channel continuously into 16 ohms.
Use of amplifiers of lower power will not allow the full
power and headroom of the UPM-2 to be realized
(though this may be acceptable in applications where
Connections The connection terminals appear on two XLR-type con-
nectors (one male, one female) located on the rear of the
UPM-2 cabinet.
The pin configuration for the XLR-type connectors has
been chosen so that microphone cable (two conductor
and shield) can be used for short speaker runs. The
connection within the cabinet is a loop-through parallel
connection, and the pin assignments are:
Pin 1 — common
Pin 2 — hot
Pin 3 — hot (in parallel with pin 2)
Verifying System
Polarity
The polarity of the UPM-2 loudspeaker is checked at the
factory before shipment, so polarity within the individual
cabinet need only be checked if replacement of a part
becomes necessary. The colored speaker wires attached
to the drivers should be connected to the corresponding
colored terminal on the potted network within the cabinet.
A polarity reversal between the 5" drivers will result in
severe cancellation at 250 Hz and a polarity reversal
between the mid-frequency 5" driver and the tweeter will
show up as a cancellation at 3600 Hz. Either of these
conditions will be very noticeable in frequency response
testing or A/B comparisons with other UPM-2’s.
The “phase-popper” type of speaker polarity checker
cannot reliably be used to test for correct polarity of
multiple UPM-2 cabinets. However, Meyer Sound’s SIM
System II many of the portable spectrum analyzers can
be used, with a pink noise source, to test system polarity
as follows:
high pressure levels are not required). Conversely, use of
amplifiers rated at significantly more than 125 watts into
16 ohms may endanger the loudspeaker, and is not
recommended.
For runs of less than 100' to a single UPM-2 the minimum
recommended wire size is 18 gauge. For parallel connections, use the loop-through connections at the UPM-2’s
and use a larger gauge cable to the amplifier. Four UPM2’s can be run on a single amplifier channel, provided
that the amplifier can drive a four ohm load.
The UPM-2 must be used with the P-2 Control Elec-
tronics Unit. For connections between the CEU and the
power amplifier, refer to its Operating Instructions.
■
Connect one loudspeaker in the array and advance the
pink noise to a convenient measuring level. Position the
measuring microphone on the axis between the first
loudspeaker and the cabinet adjacent to it, and about 6
feet distant. Note the frequency response and overall
level.
■
Leaving the first loudspeaker connected, connect the
adjacent one and observe the analyzer display. The
entire curve should jump up in level, indicating correct
addition between the loudspeakers. A polarity reversal
between the two loudspeakers will show up as a severe
low-frequency cancellation.
■
Similarly, connect the rest of the cabinets in the array
®
one by one, looking for correct addition as each loudspeaker is connected. ( It will be necessary to reposition the microphone.)
Placement and Arraying The UPM-2 is designed primarily as a supplementary
loudspeaker to provide subtle reinforcement in situations
where the coverage of the main loudspeaker system is
compromised, such as under balconies in theaters or
cabarets. When correctly installed with appropriate delay,
the system can add presence and fidelity to the sound
quality without diverting attention from the main source.
The UPM-2 is suitable for use as a conference-room
sound system for voice reinforcement and music playback, and its compact size and high power output capability makes it appropriate for situations in which a highoutput main system is undesirable, such as in houses of
worship. Further applications include surround channels
in cinema systems, and multimedia room main speakers.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
The UPM-2 features even coverage in both the horizontal
and the vertical axis, with high-frequency coverage of 60°
horizontal and vertical. To increase the coverage angle in
under-balcony situations, place two UPM-2’s end-to-end,
with the tweeters apart. You may separate the angle
between the cabinets to a maximum of 40° to increase
the effective coverage angle to 120°. For upright (sideby-side) installation, keep the separation angle between
the two cabinets to at least 20° and not more than 45°.
Always keep the rear corners of adjacent cabinets touching, where possible.
When the UPM-2 is placed in a corner (1⁄4 or 1⁄8 space
loading), the bass response of the system is extended by
up to an octave. If this additional response is not required, engage the Lo Cut switch of the P-2 to insert a
160 Hz high-pass filter.
UPM-2
Reinforcement
Loudspeaker
Operating Instructions
Physical Dimensions
Maximum Output
7.00"
7.5°
3.63"
7.70"
C
6.84"
8.63"
18.00"
16k
8k
4k
2k
1k
500
250
125
62
Frequency (Hz)
60 80 100 120
Continuous SPL (dB)
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
UPM-2
Reinforcement
Loudspeaker
Operating Instructions
Specifications
Acoustical – UPM-2/P-2
Frequency Response
1
Half space 60-16,000 Hz +4 dB
Free air 70-16,000 Hz +4 dB
Maximum SPL
2
Continuous 108 dB
Peak 118 dB
HF Distribution Pattern (-6dB points)
Horizontal 60 degrees
Vertical 60 degrees
UPM-2 Loudspeaker
Driver Complement
Low-Frequency (2) MS-5 5-inch cone drivers
High-Frequency 1" titanium dome horn driver
Passive Network
Function 3-way crossover
Capacitor Type Polypropylene
Inductor Type Ferrite core
Nominal Impedance 16 ohms
Enclosure 0.2 cu. ft. vented, multi-ply Finnish birch
Finish Black textured
Connector EP 4 (EP 5, Europe only), 3-pin XLR (male and female) or Terminal block
Protective Grill Perforated steel screen, powder coated
charcoal-grey foam covering
Mounting Points
3
⁄8"-16 nut plates
Physical Dimensions 63⁄4" W x 181⁄8" H x 71⁄8" D
Weight 16 lbs. (7.3 kg)
P-2 Control Electronics Unit
Note 1:
Measured 1 meter on axis,
Input Type Balanced (active), 47k ohms
Output Type Push-pull (active), 200 ohms source impedance
Maximum Input/Output Level
pink noise input, in thirdoctave ISO bands.
Note 2:
“A”-weighted noise input,
loudspeaker driven by
125 watt (16 ohm rating)
mono amplifier.
Hum and Noise
Dynamic Range
Sense Input 10K ohms true differential
Driver Protection Circuitry RMS and LF Excursion Limiters
Indicators
Note 3:
1 kHz, 10k
THD.
Ω
load, < 0.1%
Controls Level control, AC on/off switch, Lo Cut switch
Connectors
Note 4:
“A” weighted.
Note 5:
Power 120/240V AC, 50/60 Hz (internally switchable)
Physical Dimensions 19" W x 13⁄4" H x 73⁄4" D Standard rack mount
Weight 7 lbs. (3.2 kg)
Noise floor to maximum
output.
3
Unbalanced >+20 dBu
Balanced >+26 dBu
4
5
<–90 dBV
>105 dB
Sense Green LED
Limit Red LED
Power Green LED
Balanced Input/Output 3-pin XLR (A-3)
Sense Input Banana jacks
05.030.005.01 A © Meyer Sound, 1995.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
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