15
CHAPTER 3: THE HMS-10 LOUDSPEAKER
THE HMS-10 CONNECTOR
The HMS-10 receives DC power and balanced audio from a
Phoenix 5-pin male connector on its top panel. The connec-
tor’s five pins include two for DC power (negative and posi-
tive) and three for balanced audio (shield, negative, and
positive). These pins are clearly labeled on the HMS-10 top
panel. The connector accepts conductors up to 12 AWG
(American Wire Gauge) or 2.5 mm
2
. To function properly, the
HMS-10 requires 48 V of DC power.
A single composite cable (such as Belden 1502) wired for
both DC power and balanced audio can connect HMS-10
loudspeakers to the MPS-488
P’s channel outputs.
Each HMS-10 loudspeaker comes with one Phoenix 5-pin
female cable connector for making loudspeaker cables. For
information on HMS-10 cable requirements, see “HMS-10
Current Draw and Cable Requirements” on page 15. For
information on cables and cable accessories available from
Meyer Sound, see Appendix A, “HMS-10 Accessories.” For
information on cable assembly, see Appendix B, “HMS-10
Cable Assembly.”
CAUTION: When wiring HMS-10 loudspeaker
cables, make sure each pin in the connector is
wired correctly to avoid damage to the loudspeaker
and polarity reversal, which will affect system perfor-
mance.
Wiring HMS-10 Loudspeaker Cables with
Belden 1502 Cable
When wiring HMS-10 loudspeaker cables with Belden 1502
cable, use the conventions in Table 1. The red and black
wires in the Belden 1502 cable have a thicker gauge than
the other three wires and should be used for DC power. The
blue, white, and shield wires are shielded together and
should be used for audio.
Both ends of the HMS-10 loudspeaker cable should be
wired so that the pins in the HMS-10 connector align with
those in the MPS-488
P channel output connector (see
“Channel Inputs” on page 10).
HMS-10 Current Draw and Cable
Requirements
Each HMS-10 loudspeaker draws a maximum current of
3.31 A rms and 3.45 A peak from the 48 V DC output of the
MPS-488
P. The current draw for the HMS-10 is dynamic
and fluctuates as operating levels change. The cabling
between the HMS-10 and the MPS-488
P adds resistance
and hence causes a voltage drop at the loudspeaker.
Because lower voltages compromise peak SPL, and in
some cases frequency response, cable resistance should be
minimized.
NOTE: When connecting an HMS-10 to an
MPS-488
P channel output, the total cable
resistance should not exceed 2 ohms.
HMS-10 Connector
Belden 1502 Composite Cable
Table 1: Wiring HMS-10 Loudspeaker Cables with Belden 1502
Wire Gauge Gauge
Red DC power, positive (+) 18 AWG
Black DC power, negative (–) 18 AWG
White Balanced audio, positive (+) 22 AWG
Blue Balanced audio, negative (–) 22 AWG
Shield Balanced audio, shield 24 AWG
Red: DC power (+)
Black: DC power (–)
White: audio (+)
Blue: audio (–)
Audio shield
