4
Introduction
The Meyer MTS-4 self-powered loudspeaker is a
compact, self-contained, full-range system suited for
clubs and small theatres (throw distances < 100 ft). Its
trapezoidal shape facilitates array design that maximizes
coverage and SPL for the size of the array. Since all
frequencies are produced from one cabinet, the MTS-4
better approximates a point-source radiator, creating a
smoother frequency image than separate mid-hi and
subwoofer cabinets. The MTS-4 can be used as a PA,
front-fill, bass, and keyboard speaker, and as a side-fill
and drum monitor.
The MTS-4 contains independent amplifier and control
electronics for three low frequency cone drivers
(18”, 15”, 12”), and one high frequency horn driver
(4” diaphragm, 2” throat). Each driver is contained in a
separate vented enclosure. This integrated design
improves performance, durability, and reliability,
eliminates amplifier racks, and simplifies setup and
installation. The MTS-4 has the following acoustical
specifications:
Frequency Response
±
3 dB 30 Hz – 16 kHz
Phase Response
±
70
°
90 Hz – 17.2 kHz
Coverage
70
°
H x 60
°
V
Dynamic Range
> 110 dB
See page 14 for complete specifications.
The MTS-4 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 speakers in the network on
a Windows-based PC. Contact Meyer Sound for more
information about RMS.
AC Power
When AC power is applied to the MTS-4, the Intelligent
AC
™ supply automatically selects the correct operating
voltage, allowing the MTS-4 to be used in the US, Europe,
or Japan without manually setting a voltage switch. The
Intelligent AC power supply also performs surge
suppression for high voltage transients (up to 275 V),
minimizes inrush current, and filters EMI. Continuous
voltages above 275 VAC may damage the unit! The MTS-4
uses a NEMA L6-20P or IEC 309 male power inlet and
satisfies UL, CSA, and EC safety standards.
Voltage Requirements
The MTS-4 operates safely and without audio discon-
tinuity if the AC voltage stays within the ranges 85–
134 V or 165–264 V, at 50 or 60 Hz. 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 # 17.022.066.01;
contact Meyer Sound to receive this document). All other
users should contact Meyer Sound or an authorized
Meyer service center.
If the voltage decreases below the lower bound of either
operating range (known as a brown-out 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 MTS-4
continues to operate during brown-out 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 MTS-4 shuts down due to either low or high volt-
age, the power supply automatically turns on after three
seconds if the voltage has returned to either normal
operating range. If the MTS-4 does not turn back on after
ten seconds, remove AC power and refer to the
TROUBLE-
SHOOTING NOTE
above.
