Meyer Sound DS-4P - Manual (Page 4)

The self-powered DS-4P is an arrayable
mid-bass loudspeaker system which
provides high power and extremely low
distortion. It was developed to
supplement the 70-200Hz band in full-
range systems, affording additional mid-
bass headroom.The DS-4P is most
effective when used in multiples within
an array, and it can easily be
incorporated into conventionaly powered
or self-powered systems. The DS-4P uses
two 12-inch cone drivers in a true horn
enclosure. The horn’s flare provides
maximum energy transfer in the mid-
bands with minimum frequency response
ripple. The DS-4P’s trapezoidal shape facilitates
the creation of loudspeaker arrays that
maximize the coverage area and SPL for
the size of the array. Two types of
rigging hardware (aircraft pan fittings
and L-Track fittings) are available to
safely suspend the DS-4P.
The DS-4P can be equipped to operate
with the Remote Monitoring System
(RMS) interface network and software
application. RMS displays signal and
power levels, driver and cooling fan
status, limiter activity, and amplifier
temperature for all loudspeakers in the
network on a Windows-based PC.
The minimum configuration of two DS-
4Ps have the following acoustical
specifications:
Operating Range 60 – 250Hz
Frequency Response* 70 – 200Hz
(±4dB)
Phase Response* ±70° 70–200Hz
Dynamic Range >120dB
Coverage 120°H
120°V
*Measured with one-third octave
frequency resolution in fixed ISO
bands.
4
DS-4P: INTRODUCTION
When AC power is applied to the DS-4P,
the Intelligent AC™ supply
automatically selects the correct
operating voltage, allowing the DS-4P to
be used worldwide without manually
setting a voltage switch. The Intelligent
AC power supply also performs surge
suppression for high voltage transients
(up to 275V), minimizes inrush current,
and filters EMI. Continuous voltages
above 275VAC may damage the unit! The
DS-4P uses a NEMA L6-20P or IEC 309
male power inlet and satisfies UL, CSA,
and CE safety standards.
V OLTAGE R EQUIREMENTS
The DS-4P operates safely and without
audio discontinuity if the AC voltage
stays within the ranges 85–134V or
165–264V, at 50 or 60Hz. Immediately
after applying AC power, the green
Active LED on the user panel illuminates
and the proper operating voltage is
automatically selected, but the system
is muted. During the next three seconds,
the primary fan turns on, the main
power supply slowly ramps on, and the
system is enabled to pass audio signals.
TROUBLESHOOTING NOTE: If the Active
LED does not illuminate or the system
does not respond to audio input after
ten seconds, remove AC power to
avoid possible damage to the unit.
Experienced electronics technicians
with access to a test bench can verify
proper operation for the power supply
and amplifier system with The Meyer
Sound Self-Powered Series MP-2 and
MP-4 Field Verification Procedure
(part #17.033.066.01); contact Meyer
Sound to receive this document). All
other users should contact Meyer
Sound or an authorized Meyer Sound
service center.
If the voltage decreases below the lower
bounds of either operating range
(known as a brownout period), the
supply uses current from its storage
circuits and continues to function
briefly. The unit turns off if the voltage
does not increase above the threshold
before the storage circuits are depleted.
The length of time that the DS-4P
continues to operate during brownout
depends on how low the voltage drops
and the audio source level during this
period.
If the voltage fluctuates within either
operating range, automatic tap selection
stabilizes the internal operating voltage.
This tap selection is instantaneous and
there are no audible artifacts. If the
voltage increases above the upper
bound of either range, the power supply
turns off rapidly, preventing damage to
the unit.
If the DS-4P shuts down due to either
low or high voltage, the power supply
automatically turns on after three
seconds if the voltage has returned to
normal operating range. If the DS-4P
does not turn back on after ten seconds,
remove AC power and refer to the
TROUBLESHOOTING NOTE previously in
this section.
C
URRENT
R
EQUIREMENTS
The DS-4P presents a dynamic load to
the AC mains which causes the amount
of current to fluctuate between quiet
and loud operating levels. Since
different types of cables and circuit
breakers heat up (and trip) at varying
rates, it is essential to understand the
types of current ratings and how they
correspond to circuit breaker and cable
specifications.
The maximum continuous RMS current
is the maximum RMS current over a
duration of at least 10 seconds. It is
used to calculate the temperature
increase in cables, which is used to
select cables that conform to electrical
code standards. It is also used to select
the rating for slow-reacting thermal
breakers.
The maximum burst RMS current is the
maximum RMS current over a one
second duration. It is used to select the
rating for most magnetic breakers.
The maximum instantaneous peak
AC POWER