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UP-4XP OPERATING INSTRUCTIONS
13
Clipping (Red)
The UP-4XP turns red when the loudspeaker’s input stage
clips, causing the amplifier to overload. When the LED is
red, the source level should be reduced.
CAUTION: If the UP-4XP LED turns solid red
and the loudspeaker continues to output audio,
though at reduced levels, the loudspeaker’s voltage
may have dropped below 25 V DC. When these con-
ditions are encountered, operation of the loudspeaker
should cease and its power supply and cabling
should be verified.
UP-4XP CURRENT DRAW AND CABLE
REQUIREMENTS
Each UP-4XP loudspeaker draws a maximum current of
4.05 A continuous and 4.50 A peak from its external 48 V
DC power supply. The current draw for the UP-4XP is
dynamic and fluctuates as operating levels change. The
cabling between the UP-4XP and its external power supply
adds resistance and hence causes a voltage drop at the
loudspeaker. Because lower DC voltages compromise
amplifier performance (peak SPL), and in some cases fre-
quency response, cable resistance should be kept to a mini-
mum.
NOTE: For long cable runs, you can use a large
cable gauge for DC power and a separate bal-
anced audio cable for audio. For more information,
see “Long Cable Runs with Separate Cable for DC
Power and Audio” on page 14.
Cable Lengths and Cable Gauges for UP-4XP
Loudspeakers
Cable lengths up to 150 feet between the UP-4XP and its
external power supply are supported with only 1 dB of peak
SPL loss using 18 AWG wire. Longer cable lengths are pos-
sible with heavier wire gauges (see Table 1 and Table 2).
NOTE: The total cable resistance between the
UP-4XP and its external power supply should
not exceed 2 ohms.
Calculating the Maximum Cable Length
The maximum cable length for a UP-4XP can be calculated
with the following formula:
maximum length = 2 ohms / 2 * cable resistance
For example, the maximum length of an 18 AWG cable with
a resistance of 0.00636 is 157.2 feet (2 / 2 * 0.00636).
!
Table 1: UP-4XP Loudspeaker Cable Lengths (AWG)
Cable Gauge Resistance
(/ft)
Approximate
Max. Length
12 AWG 0.0016 600 ft
14 AWG 0.00253 375 ft
16 AWG 0.00402 237 ft
18 AWG 0.00636 150 ft
20 AWG 0.01008 87 ft
Table 2: UP-4XP Loudspeaker Cable Lengths (European)
Cable Gauge Resistance
(/m)
Approximate
Max. Length
2.50 mm
2
0.0052 157 m
1.50 mm
2
0.01076 87 m
1.00 mm
2
0.02087 45 m
0.75 mm
2
0.03307 27 m