Lectrosonics Quadra User Manual download pdf (Page 5)

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Digital IEM System

System Overview

The Quadra system provides an entirely new level

of audio and RF performance in a wireless monitor

system. The combination of analog or digital input

capability, ultra-low latency 24 bit, 48 kHz audio, digital

RF modulation and discrete four channel mixing capa-

bility make the Quadra a truly unique IEM product for

mission-critical, professional applications.

The system is designed for line level analog audio

signals and AES/EBU digital audio input signals.

48kHz/24-bit audio, ruler-ﬂat 20Hz to 20kHz frequency

response, ultra-low distortion and high dynamic range

assure excellent audio quality. Housings and panels

are machined aluminum with electrostatic powder

coated and anodized ﬁnishes and laser etched mark-

ing for durability. An intuitive mixing interface and

comprehensive LCD on the belt pack receiver provide

performing artists and monitor engineers alike with a

comfortable and conﬁdent user experience.

M4 Transmitter

The half-rack transmitter can accept up to four inputs

from digital or analog sources. The inputs can be con-

ﬁgured as follows:

• Four analog inputs using all four jacks

• Two digital inputs using jack 1 and two balanced

analog inputs using jacks 3 and 4

• Four digital inputs using jacks 1 and 2

The input connectors are full size balanced XLR types

for AES/EBU and balanced line level analog signals.

Input preamp circuits use a special balanced ampliﬁer

with very high common mode rejection to minimize

hum and noise.

Either analog or AES/EBU digital input signals are

converted to an internal 24-bit digital format which is

then encoded, organized into packets, and passed to

an RF modulator using spread spectrum techniques

and error correction for robust reception. The modu-

lated RF signal is ﬁltered before and after ampliﬁcation

to suppress out-of-band noise and spurious signals,

and a circulator/isolator guards against intermodulation

interference (IM).

The transmitter can be free-standing or rack-mounted

in single units (via an optional rack mounting kit) or in

a dual conﬁguration using supplied hardware.

A USB port is provided for ﬁrmware updates.

M4 Receiver

The receiver employs advanced antenna switching

diversity reception, switching between the antennas

during packet headers in order to maintain a seamless

audio signal. A conﬁgurable four-channel mixer on the

top of the receiver housing allows the user to mix four

discrete audio channels according to the needs of the

performance. The headphone jack is fed from a high-

quality stereo ampliﬁer with adequate power to drive

headphones or earbuds to sufﬁcient levels for stage

performance or other environments with signiﬁcant

background noise. A high-density, backlit LCD allows

the user to make setup changes via the available

menu options.

A USB port is provided for ﬁrmware updates.

Frequency Range

Using the license free 902 - 928 MHz ISM band, this

system is outside the normal broadcast frequencies

thus providing both technical and operational advan-

tages over standard analog systems.

Freq 1

Freq 2

Freq 3

Freq 4

4 CHANNEL MODE

2 CHANNEL MODE

Freq

In four-channel mode, the system occupies 4 MHz and

is selectable between four available center frequen-

cies: 907.776, 912.384, 916.992 and 923.904 MHz.

In two-channel mode, Quadra occupies 2 MHz and

is selectable between eight available center frequen-

cies: 906.624, 908.928, 911.232, 913.536, 915.840,

918.144, 922.752 or 925.056 MHz.

Multi-Channel Capability

Quadra can be conﬁgured to provide either 2 or 4

audio channels. In the 2-channel mode, eight different

frequencies are available, each with two audio chan-

nels. In the 4-channel mode, four different frequencies

are available, each with four audio channels. Multiple

Quadra systems can be operated in the same location

to provide up to 16 total audio channels between all

units.

The performer can then use the on-board mixer to tai-

lor the audio output to his or her tastes or the require-

ments of the performance at hand.

Rio Rancho, NM

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