Chapter 2: Connecting Ashby Loudspeakers; Ashby Power And Input Panel; Cable Specification - Meyer Sound Ashby-5C Operating Instructions Manual

CHAPTER 2: CONNECTING ASHBY LOUDSPEAKERS

ASHBY POWER AND INPUT PANEL

The Ashby-5C and Ashby-8C loudspeakers require a
Meyer Sound MPS IntelligentDC Power Supply to function
properly. The MPS-488HP, for example, can power up to 24
Ashby-5C (3 per channel) or 16 Ashby-8C (2 per channel).
Ashby loudspeakers receive DC power (-, +) and balanced
audio (+, -, shield) from a Phoenix 5-pin male input connector.
The pins are clearly labeled on the Ashby Power and Input
panel shown below.
Figure 1: Ashby Power and Input panel
Looping
Ashby loudspeakers can be looped using the connectors on
the Ashby Power and Input panel. The table below shows the
maximum number of loudspeakers that can be looped from
one channel of an MPS Power Supply to function properly
and meet compliance requirements.
Model Maximum Number
Ashby-5C 3 (2 looped)
Ashby-8C 2 (1 looped)
1 Ashby 8C
Mixed
1 Ashby 5C
Loudspeaker Attenuator Knob
All Ashby loudspeakers powered by a single channel of an
MPS Power Supply receive the same DC voltage and the
same audio signal. To set loudspeakers to different levels,
use the Loudspeaker Attenuation knob (on Ashby loudspeak-
ers equipped with this feature).
The Loudspeaker Attenuator knob (shown below) is located
on the front bezel. Possible values are: 1, 2, 3, 6, 10, and 20
dB.
Figure 2: Loudspeaker Attenuator

CABLE SPECIFICATION

Each loudspeaker ships with two Phoenix 5-pin, female
cable-mount connectors for loudspeaker cable assembly
(see "Assembling Phoenix-to-Phoenix Loudspeaker Cables"
on page 25).
A single composite cable (e.g., Belden 1502) can route DC
power and balanced audio to the Ashby loudspeakers (see
"Belden 1502 Cable" on page 13).
It is extremely important to connect each pin correctly. Main-
tain proper polarity (- to -, + to +) or system performance will
degrade and possibly damage the loudspeaker (see
Appendix B, "Assembling Phoenix-to-Phoenix Loudspeaker
Cables").
CAUTION: Connect the 48 VDC directly (and
only) from the external power supply to the
48 VDC pins on the loudspeaker connector.
Current Draw
DC current draw for Ashby loudspeakers is dynamic and fluc-
tuates with changing operating levels. As the cable length
increases between an Ashby loudspeaker and its external
power supply, so does the resistance, which can eventually
cause a voltage drop at the loudspeaker. This can compro-
mise amplifier performance, peak SPL, and frequency
response. The next section shows how to select the right
cable gauge for each loudspeaker.
ASHBY OPERATING INSTRUCTIONS
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