CHAPTER 3: THE HMS-10 LOUDSPEAKER
16
Cable Lengths and Cable Gauges for HMS-10s
When connecting an HMS-10 to an MPS-488P channel out-
put, you can use cable lengths up to 150 feet with only 1 dB
of peak SPL loss using 18 AWG wire. Longer cable lengths
are possible with heavier wire gauges (see Table 2 and
Table 3).
The maximum cable length for an HMS-10 can be calcu-
lated 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).
NOTE: For long cable runs, use a large cable
gauge for DC power and a separate balanced
audio cable for audio.
CONNECTING HMS-10 LOUDSPEAKERS TO
THE MPS-488
P
To connect HMS-10 loudspeakers to the MPS-488P:
1. Power off the MPS-488
P.
2. Connect audio sources (from a mixer or processor) to the
MPS-488
P channel inputs. Use balanced XLR cables.
3. Use the MPS-488
P Link switches to route channel inputs
to the desired channel outputs. For more information,
see “Link Switches” on page 10.
4. Connect up to four HMS-10 loudspeakers to the
MPS-488
P channel outputs. Connect only to channel
outputs 1, 3, 5, and 7. Use a composite cable (such as
Belden 1502) outfitted with Phoenix connectors and
wired for both DC power and balanced audio.
TIP: You can also use two separate cables for
HMS-10 loudspeaker connections: 2-conductor
cable for DC power and 3-conductor cable for bal-
anced audio, both attached to a single Phoenix con-
nector on each cable end.
CAUTION: Make sure the HMS-10 loud-
speaker cables are wired correctly. For details
on assembling loudspeaker cables, see Appendix B,
“HMS-10 Cable Assembly.”
5. Power on the MPS-488
P and monitor the LEDs on the
front panel to verify connections (for more information,
see “Voltage and Load Current LEDs (1–8)” on page 9).
6. Enable output from the audio sources (from the mixer or
processor) connected to the MPS-488
P.
Table 2: HMS-10 Loudspeaker Cable Lengths (AWG)
Cable Gauge Resistance
(Ω/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 3: HMS-10 Loudspeaker Cable Lengths (European)
Cable Gauge Resistance
(Ω/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
