Meyer Sound UPL-2, UPL-1 User Manual
UPL-1 & UPL-2
High Definition
Reinforcement
Loudspeakers
The Meyer Sound
UPL-1 and UPL-2 are
self-contained, highdefinition, powered
loudspeakers suitable
for a wide variety of
high quality sound
reinforcement applications. The UPL-1
and UPL-2 incorporate line-level control
electronics mounted
within a rear panel
chassis, including:
• dual power
amplifiers for
biamplification
• an active balanced
input circuit with
switchable sensitivity (+4 dBu or
-10 dBV)
Operating Instructions
• an active crossover
utilizing optimized
pole-zero filter
combinations to
achieve acoustical
transparency and
linear phase
• independent protection circuits for
each loudspeaker
driver
The UPL-1 and UPL-2 are two-way systems
comprising a 10-inch cone low-frequency
driver and 1-inch high-frequency driver housed
in a vented cabinet. Both drivers are of a proprietary design, and are individually selected
for maximum linearity. The high-frequency
horn driver employs a titanium dome and silk
suspension in a patented, low distortion design
(US patent number 4,152,552). It is coupled to
° by 40° modified radial horn in the UPL-1,
a 90
and to a 60° aspherical waveguide in the UPL-2.
Aligned to closely approximate true point
source radiators within their coverage area,
the UPL-1 and UPL-2 feature tightly controlled
time delay response with minimal deviation
from linear phase across the full frequency
range of their operation. Each unit is individually factory-calibrated to ensure a free-field
frequency response that is flat within ±2 dB
from 50 Hz to 18 kHz. The UPL-1 and UPL-2
each deliver 124 dB peak SPL (1 meter) with
>100 dB dynamic range.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
UPL-1 & UPL-2
High Definition
Reinforcement
Loudspeakers
Operating Instructions
Amplifiers and
Driver Protection
Power and Fuses
Connections
Independent power biamplifiers maximize system
headroom, efficiency and damping while minimizing distortion. The low frequency amplifier delivers
200 watts burst output power, while the high frequency amplifier provides 100 watts. Both employ
complementary power MOSFET output stages
operating class A at moderate listening levels
(<90 dB SPL), and class AB at high levels.
The UPL-1 and UPL-2 accept AC voltages from 90
to 260 VAC, at 50 or 60 Hz, in four ranges. Select
the range that is closest to the local mains voltage.
Do not switch among AC voltage ranges with the
power cable connected to an outlet. The UPL-1
and UPL-2 require a grounded outlet. Never cut
the earth ground pin or “float” the mains ground.
The UPL-1 and UPL-2 present a 10k ohm input
impedance at a three-pin XLR-type receptacle
wired as follows:
Pin 1 — Audio common
Pin 2 — Signal low (-)
Pin 3 — Signal high (+)
Case — Earth (AC) ground
Shorting any input connector pin to the case may
form a ground loop and cause hum. Standard
audio cables with XLR-type connectors may be
used for balanced signal sources. Unbalanced
sources will require an in-line adapter.
Where multiple UPL-1’s or UPL-2’s are driven from
a single source, it is best to “mult” at the source
output and run individual shielded cables to each
of the loudspeaker inputs.
The driver protection circuits employ thermo-predictive limiters and soft peak clamps to guard
against damage from excessive amplifier power
and ensure graceful overload characteristics.
Always set the voltage selector switch before connecting and operating the unit.
The unit is protected by a fast-acting fuse in the
voltage selector switch. If the fuse blows, check
the line voltage and voltage switch setting. Always
replace the fuse with the same type and rating.
Be certain that the source equipment is capable of
driving the total load impedance presented by the
paralleled loudspeaker input circuits. For example,
since the input impedance is 10k ohms, a source
output that can drive 600 ohms will handle a maximum of 16 UPL-1’s or UPL-2’s in parallel
(625 ohms total load impedance). If any of the
paralleled loudspeakers loses power, however, it
may cause distortion in some, or all, of the others.
The best solution for driving multiple units from one
source is to use individual, isolated outputs. This
can be accomplished, for example, by assigning
one channel of a CP-10 Complementary Phase
Parametric Equalizer to each loudspeaker and
branching the source output to the CP-10 inputs.
The system may then be aligned using SIM
tem II.
®
Sys-
Sensitivity Switch
Signal / Overload
Indicator
For professional balanced equipment, use the
+4 dBu setting. For semiprofessional and consumer unbalanced equipment, use the -10 dBV
setting. Driving the UPL-1 or UPL-2 from a +4 dBu
source with the switch set to -10 dBV will result in
increased noise.
Note that the -10 dBV setting is
In normal operation, the rear-panel LED will glow
green. At high listening levels, the LED may flash
red on program peaks. This indicates the onset of
overload, where the loudspeaker protection limiters
are activated.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
more sensitive
(designed for
setting:
• +4 dBu position:
1.23 VRMS = 114 dB SPL
• -10 dBV position:
0.316 VRMS = 114 dB SPL
If the LED is continuously red for an extended
period (8 hours or longer), thermal damage may
result.
lower
signal levels) than the +4 dBu
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