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M2Ra
M2Ra Digital IEM Receiver
The M2Ra Digital IEM Receiver is a compact, rugged
body-worn unit providing excellent sound quality for
performers or any professionals needing to monitor
detailed audio wirelessly. The M2Ra employs advanced
antenna diversity switching during digital packet head-
ers for seamless audio. The receiver uses digital modu-
lation and covers UHF frequencies from 470.100 to
691.175 MHz (depending on Locale).
The headphone jack is fed from a high-quality stereo
amplifier with 250 mW available to drive even inefficient
headphones or earphones to sufficient levels for stage
performance or other noisy environments. The receiver
can select from stereo, mono from left or right channels
only, or mono from both channels, giving the unit flex-
ibility in terms of application as an IEM or IFB receiver.
An intuitive interface and high resolution, color LCD on
the unit provide performing artists and audio profession-
als alike with a comfortable and confident user experi-
ence.
The M2Ra also employs 2-way IR sync, so can data
from the receiver can be sent to an M2T transmitter and
thus onto Wireless Designer™ Software. This way, fre-
quency planning and coordination can be done quickly
and confidently with on-site RF information.
FlexList™
Additionally, the M2Ra includes a FlexList™ mode,
where up to 16 mixes can be accessed by name. This
feature enables a monitor engineer to quickly find and
listen to any of the performer's mixes on the stage.
A FlexList mix is a profile of a performer's personal
transmitter. The mix includes the performer's name (or
whatever name the user chooses for that unit), fre-
quency, mixer settings and limiter settings. The mix is
easily shared via the M2Ra IR port, added to the list of
16 mixes and stored until cleared by the user. The M2Ra
allows the user to scroll through the mixes, making
troubleshooting issues easy and efficient.
Smart Tuning (SmartTune™)
A major problem facing wireless users is finding clear
operating frequencies, especially in RF saturated envi-
ronments. SmartTune™ overcomes this problem by au-
tomatically scanning all the frequencies available in the
receiver's frequency range and tuning the receiver to the
frequency with the lowest RF interference, significantly
reducing setup time.
NOTE: Some regions have certain frequency
restrictions. Depending on LOCALE selection,
the SmartTune and Scan frequency ranges are:
NA: 470.100 - 607.950 MHz
EU: 470.100 - 614.375 MHz
A1B1:
AU: 520.000 - 614.375 MHz
JA: 470.150 - 614.375 MHz
EU: 537.600 - 691.175 MHz
B1C1:
AU: 537.600 - 691.175 MHz
JA: 537.600 - 691.175 MHz
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RF Front-End with Tracking Filter
A wide tuning range is helpful in finding clear frequen-
cies for operation, however, it also allows a greater
range of interfering frequencies to enter the receiver.
The UHF frequency band, where almost all wireless mi-
crophone systems operate, is heavily populated by high
power TV transmissions. The TV signals are immensely
more powerful than a wireless microphone or IEM
transmitter signal and will enter the receiver even when
they are on significantly different frequencies than the
wireless system. This powerful energy appears as noise
to the receiver, and has the same effect as the noise
that occurs with extreme operating range of the wire-
less system (noise bursts and dropouts). To alleviate this
interference, front-end filters are needed in the receiver
to suppress RF energy below and above the operating
frequency.
The M2Ra receiver employs a selective frequency,
tracking filter in the front-end section (the first circuit
stage following the antenna). As the operating frequency
is changed, the filters re-tune into six different "zones"
depending on the selected carrier frequency.
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470 MHz
Encryption
When transmitting audio, there are situations where
privacy is essential, such as during professional sport-
ing events, in court rooms or private meetings. For
instances where your audio transmission needs to be
kept secure, without sacrificing audio quality, Lectro-
sonics implements AES256 encryption in our digital
wireless systems. High entropy encryption keys are
first created by one of the units in the system. The key
is then synced with another encryption-capable unit,
via the IR port. The audio will be encrypted and can
only be decoded if both the transmitter and receiver
have the matching encryption key. If you are trying to
transmit an audio signal and keys do not match, all that
will be heard is silence. The M2Ra gives the option of
Encrypted (256-bit encryption - AES 256-CTR) and non-
encrypted operation under one firmware version.
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614 MHz
LECTROSONICS, INC.
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