| The Meyer Sound MPS-488HPe external power supply delivers DC power and
balanced audio to up to eight Meyer Sound loudspeakers that require an external
48 V DC power supply. The single-space 19-inch rack MPS-488HPe can be used
with the Meyer
Sound UP-4XP ultracompact loudspeaker, Meyer
Sound MM-4XP miniature loudspeaker, Meyer
Sound MM-10XP miniature subwoofer, and Meyer Sound HMS-10 surround loudspeaker.
Meyer Sound's externally powered loudspeakers are equipped with onboard
amplification and signal-processing circuits that store DC power and tolerate
voltage drops (up to 30%), thereby accommodating light-gauge cables and
lengthy cable runs. Powering loudspeakers from an external source eliminates
the need for wiring conduits while still preserving the advantages of
self-powered systems.
The Meyer Sound MPS-488HPe receives eight channels of balanced audio
from its XLR female input connectors and routes the audio, along with
48 V of DC power, to its eight output connectors. Input channels feature
toggle switches that route inputs to corresponding channel outputs only,
or to adjacent, contiguous channel outputs. For example, channel input
1 can be routed to channel outputs 1 and 2 and channel input 3 can be
routed to channel outputs 3 and 4. Another example would be to route channel
input 1 to channel outputs 1–4 and channel input 5 to channel outputs
5–8.
Meyer Sound's MPS-488HPe eight channel outputs are equipped with sophisticated
microprocessor- controlled current limiting that protects each channel
from short circuits and unexpected voltages. The Meyer Sound MPS-488HPe
power supply outputs are SwitchCraft® EN3 5-pin female connectors.
The Meyer Sound MPS-488HPp power supply outputs are Phoenix 5-pin male
connectors. Outputs can deliver DC power to loudspeakers at cable lengths
up to 150 feet or 300 feet (depending on the loudspeaker model) with just
1 dB of loss in peak SPL using 18 AWG wire. The use of composite multiconductor
cables (such as Belden® 1502) allows a single cable to carry both
audio and DC power from the MPS-488HPe to the loudspeakers. Longer cable
lengths are possible for moderate applications that don't drive the loudspeakers
to maximum output, as well as for installations with heavier wire gauges.
The Meyer Sound MPS-488HPe front panel has two LEDs per channel output
that provide useful feedback on the status of the system. The voltage
LEDs indicate when voltage is present for each channel output. The load
current LEDs indicate when a loudspeaker is connected to a channel output,
glow brighter as the signal level increases, and flash when a short circuit
is encountered.
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