Operating instructions

ULTRA XP OPERATING INSTRUCTIONS
11
NOTE: For more information on cable assem-
bly, refer to Appendix B, “Assembling Loud-
speaker Cables.”
NOTE: For a complete list of available cables
and cable accessories from Meyer Sound,
refer to Appendix A, “Ultra XP Accessories.”
LONG CABLE RUNS WITH SEPARATE CABLE
FOR DC POWER AND AUDIO
For installations where Belden 1502 is not feasible, or for
installations that require cable runs longer than 150 feet, you
can use separate cables for DC power and balanced audio:
a large-gauge cable for DC and a high-quality, balanced
audio cable for audio. The separate cables attach to the
Phoenix connector at the loudspeaker as shown in the
Figure 1. Cable runs longer than 150 feet for DC power
require cable gauges larger than 18 AWG; for more informa-
tion, see “Cable Lengths and Cable Gauges” on page 10.
EN3-TO-PIGTAIL CABLES
Ultra XP loudspeakers with EN3 connectors ship with an
EN3 5-pin-to-pigtail cable. The EN3 end of the cable con-
nects directly to the loudspeaker input connector. The pigtail
end of the cable, which connects to the external power sup-
ply, can be terminated with either an EN3 5-pin male con-
nector (included with the MPS-488HPe) or a Phoenix 5-pin
female connector (included with the MPS-488HPp). The pig-
tail can also be spliced to a longer loudspeaker cable or to a
junction box. The EN3-to-pigtail cable uses Belden 1502
cable (or equivalent), which can be wired for both DC power
and balanced audio. The EN3-to-pigtail cable is available in
plenum or regular (non-plenum) versions.
LIMIT LEDS
When source levels for Ultra XP loudspeakers exceed maxi-
mum input levels for its drivers, limiting is engaged and is
indicated by the two Limit LEDs on the rear user panel. The
bottom LED indicates limiting for low-frequency channels.
The top LED indicates limiting for high-frequency channels.
When engaged, limiting not only protects the drivers, but
also prevents signal peaks from causing excessive distor-
tion in the amplifier’s channels, thereby preserving head-
room and maintaining smooth frequency responses at high
levels. When source levels return to normal, below the lim-
iter’s threshold, limiting ceases.
Ultra XP loudspeakers perform within their acoustical speci-
fications at normal temperatures when the Limit LEDs are
unlit, or when the LEDs are lit for 2 seconds or less and then
turn off for at least 1 second. If an LED remains lit for longer
than 3 seconds, the loudspeaker enters hard limiting where:
■ Increases to the input level have no effect.
■ Distortion increases due to clipping and nonlinear driver
operation.
■ Drivers are subjected to excessive heat and excursion,
compromising their life span.
CAUTION: The Limit LEDs indicate when a
safe, optimum level has been exceeded. If an
Ultra XP loudspeaker begins to limit before reaching
the required SPL, consider adding more loudspeak-
ers to the system.
Figure 1: Separate Cables for DC Power and Balanced Audio
EN3-to-Pigtail Cable
Pin #1 48 V DC (–)
Pin #2 48 V DC (+)
Pin #3 Audio shield
Pin #4 Audio (–)
Pin #5 Audio (+)
Audio
cable
DC
cable
Limit LEDs
High-frequency
Low-frequency