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CHAPTER 2: CONNECTING ASHBY LOUDSPEAKERS
ASHBY POWER AND INPUT PANEL
The Ashby-5C and Ashby-8C loudspeakers require an MPS-
488HP IntelligentDC power supply to function properly. The
MPS-488HP can power up to 24 Ashby-5C (3 per channel) or
16 Ashby-8C (2 per channel).
Ashby speakers 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 speakers can be looped using the connectors on the
Ashby Power and Input panel. The table below shows the
maximum number of speakers that can be looped from one
channel of the MPS- 488HP power supply to function prop-
erly and meet compliance requirements.
Model
Maximum Number
Ashby-5C
3 (2 looped)
Ashby-8C
2 (1 looped)
1 Ashby 8C
Mixed
1 Ashby 5C
Speaker Attenuator Knob
All Ashby speakers powered by a single channel of an MPS-
488 receive the same DC voltage and the same audio signal.
To set speakers to different levels, use the Speaker Attenua-
tion knob (on Ashby speakers equipped with this feature).
The Speaker Attenuator knob (shown below) is located on the
front bezel. Possible values are: 1, 2, 3, 6, 10, and 20 dB.
Figure 2: Speaker Attenuator
CABLE SPECIFICATION
Each speaker ships with two Phoenix 5-pin, female cable-
mount connectors for speaker cable assembly (see "Assem-
bling Phoenix-to-Phoenix Loudspeaker Cables" on page 21).
A single composite cable (e.g., Belden 1502) can route DC
power and balanced audio to the Ashby speakers (see
"Belden 1502 Cable" on page 9).
It is extremely important to connect each pin correctly. Main-
tain proper polarity (- to -, + to +) or system performance will
degrade and possibly damage the speaker (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 speaker 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 speaker.
7
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