The Meyer MTS-4A self-powered loudspeaker is a compact,
self-contained, full-range system suited for clubs and small
theatres (throw distances less than 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-4A better approximates a point-
source radiator, creating a smoother frequency image than
separate mid-hi and subwoofer cabinets. The MTS-4A can be
used as a PA, front-fill, bass, and keyboard speaker, and as a
side-fill and drum monitor.
The MTS-4A 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-4A 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 12 for complete specifications.
The MTS-4A can be equipped to operate with the Remote
Monitoring System (RMS)
1
interface network and software
application.
THE MTS-4A: INTRODUCTION
4
AC POWER
When AC power is applied to the MTS-4A, the Intelligent AC™
supply automatically selects the correct operating voltage,
allowing the MTS-4A 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-4A uses a NEMA L6-20P or IEC 309 male power
inlet and satisfies UL, CSA, and EC safety standards.
VOLTAGE REQUIREMENTS
The MTS-4A operates safely and without audio discontinuity 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.
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-4A 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-4A shuts down due to either low or high voltage,
the power supply automatically turns on after three seconds if
the voltage has returned to either normal operating range. If
the MTS-4A does not turn back on after ten seconds, remove
AC power and refer to the Note above.
NOTE: We recommend that the power supply be operated
at least a few volts away from the upper and lower
bounds of the operating windows to avoid brown-out
and possible shutdown.
CURRENT REQUIREMENTS
The MTS-4A 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
1. 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.
