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INTRODUCTION
Three-Way System
Unlike similar conventional systems, the UPM-1P and UPM-
2P loudspeakers are three-way systems. In the pass band
below 320 Hz, where greater power handling and cone area
are needed, the 5-inch drivers are driven together in parallel.
However, above 320 Hz a high-pass filter rolls off the signal
going to one of the drivers, so only one of the two drivers re-
produces the critical mid frequencies close to the crossover
frequency. Since power requirements are drastically lower
in this region, there is no loss in response. and a remarkably
uniform response at all frequencies along all axes — hori-
zontal, vertical and diagonal.
NOTE:
In conventional two-way designs
both low-mid drivers reproduce the same
information throughout their operating range. At
low frequencies this is not an issue, since the
wavelengths (500 Hz, about two feet) are longer
than the distance between the center points of the
two cones. But at around 1 kHz, problems arise
in the off-axis vertical response of the system.
As the wavelengths of critical mid frequencies
approach the distance between loudspeaker
centers, significant comb filtering effects appear.
These "holes" can be quite severe. In applications
where such a loudspeaker is mounted vertically
and the audience area is contained entirely within
a 50-degree vertical arc, sharp off-axis attenuation
may not be detrimental. However, if you flip the
cabinet on its side to use it as an under-balcony
loudspeaker, you will experience serious difficulties.
The UPM-1P and UPM-2P loudspeakers provide a more
elegant solution, with an active crossover distributing the
signal between the low- and high-frequency sections, and
a simpler 2-way passive crossover that is employed to
implement the single-point midrange solution. In addition, a
sophisticated phase correction circuit in the active electron-
ics compensates for phase shift in the passive network. The
result is a significantly better system impulse response, and
better imaging when UPM-1P and UPM-2P loudspeakers
are used in stereo or multi-channel applications.
2
APPLICATIONS
The UPM-1P and UPM-2P loudspeakers are designed
to be used in a wide variety of applications in sound
reinforcement, as well as music playback and monitoring.
In theatre sound design, the UPM-1P and UPM-2P
loudspeakers may be used as fill as well as a stand-
alone effects loudspeaker system for surround, onstage
effects and anywhere a compact device is required. For
example, equally spacing UPM-1P loudspeakers across the
downstage edge or under a balcony offers very accurate
audio reproduction for theatre design (Figure i.3).
UP M-1P
Figure i.3: UPM-1Ps arranged across a downstage edge
The UPM-1P loudspeaker's wide 100-degree pattern is
designed to keep sound from being too localized, allowing
for more even SPL distribution across seats near to the
stage or any other areas the loudspeaker is intended to
cover. For more focused directional control, the UPM-2P's
45-degree beamwidth produces a narrow, symmetrical
pattern to accommodate ultra-precise design requirements.
The 123 dB peak SPL of the UPM-1P and UPM-2P
loudspeakers makes them an excellent choice for use as
fill in sports facilities. They can be used in stadiums and
arenas as upper level delay loudspeaker or under upper
level overhangs, as well as in suites and box seats that fall
out of the main system's direct path.
The UPM-1P and UPM-2P loudpseakers also work
as stand-alone PA systems for accurate spoken word
reproduction and, with the addition of a companion
subwoofer, a small music reinforcement system.
In addition, because of the flatter phase and frequency
response of Meyer Sound UltraSeries loudspeakers, the
UPM-1P and UPM-2P loudspeakers can be ideal for high
definition music monitoring when used with a subwoofer.
The wide-coverage UPM-1P loudspeaker provides better
imaging in stereo and 5.1 playback applications, while
the narrower UPM-2P gives you the flexibility to localize
coverage in the near field.
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