Ultra Monitor Product Manual

Operating Instructions
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
UM-1C
UltraMonitor
TM
When the UM-1C is placed on the floor in its normal posi-
tion (horn facing up towards the performer), there will be
a boost in the low frequency response of the loudspeaker.
This is caused by the loudspeaker coupling with the floor,
and may be corrected at the M-1A Control Electronics
Unit by switching in the Lo Cut filter on the Preset Panel.
Please refer to the M-1A Operating Instructions for a
complete description of its controls.
Placement of the
UM-1C UltraMonitor
Rigging
The UM-1C loudspeaker has four steel rigging brackets
internally mounted as an integral part of the cabinet
design and the cabinet is supplied with either aircraft pan
fittings (ring or stud) or
3
⁄8" –16 nut plates according to
user preference. A flat plate is supplied when no rigging
hardware is specified. All three plate types are held in
place by six Phillips-head machine screws and can be
interchanged at any time. The handles on the UM-1C
cabinet are provided solely for moving and carrying the
loudspeaker and are not to be used for rigging purposes.
The rigging hardware is so designed that a single point
can support the normal load for the cabinet. In the
case of the UM-1C, the recommended maximum load is
420 lbs (190 kg). Any of the individual rigging points is
capable of supporting this load with an adequate safety
margin. However, Meyer Sound strongly recommends
that safety lines be run to the other points. If the struc-
tural integrity of any cabinet has been compromised by
damage or negligence, then the safety of the rigging
cannot be assured. All rigging should be done by
competent professionals.
The UM-1C UltraMonitor is designed to be used as a
stage monitor. However, its compact size and perfor-
mance capabilities make it a practical side- or front-fill
PA speaker. The 60-degree symmetrical coverage
pattern of the high frequency horn is most effective in
situations where narrow coverage angles are preferred.
High Frequency
Network
The UM-1C loudspeaker contains, mounted in the enclo-
sure, a DC protection and response correction network
for the high-frequency horn driver. The network is
mounted directly behind the MS-12 low-frequency cone
driver on the inside rear face of the cabinet, and is wired
in series with the horn driver.
The circuit board is fitted with five terminals, two of which
(labeled AMP- and AMP+) are wired to the Cannon EP-4
connector pins 3 and 4. The other terminals (labeled
FLAT and 16KPK), provide two options for tailoring the
system’s response. With the high driver common (green)
wire connected to the FLAT terminal, the UM-1C high-
frequency response is nominally flat to 20 kHz. When the
common wire is connected to the 16KPK terminal, the
UM-1C exhibits a peaked response in the 16 kHz region.
The UM -1C is shipped with the high driver common
connected for flat response. Should you desire more
high-frequency energy, simply remove the six bolts
holding the MS-12 in place, pull the MS-12 up and out of
the cabinet, and move the green wire from the FLAT
terminal to the 16KPK terminal. Be careful not to disturb
the other wires to the network board or Cannon connec-
tor. When replacing the MS-12, be certain to tighten the
six bolts evenly.
AMP+
WHT
AMP -
GRN
TESTED:_________
DATE:___________
DRVR+
WHT
FLAT
DRVR-
GRN
©1992 Meyer Sound Y-1PD PCB Assy. # 24.052.103._________Rev_________
16KPK
UM-1C High-Frequency Network Circuit Board