RDL TXMX2R Installation Guide

TX™ SERIES

Model TX-MX2R
Audio Mixer / Distribution Amplifier

ANYWHERE YOU NEED...

• To Mix Two Unbalanced Audio Signals

• To Combine Stereo into Mono

• Gain Trim for Each Input

• Two Active Isolated Outputs from the Input Signal(s)

• Isolation between Inputs

• High Quality Unbalanced Audio

You Need The TX-MX2R!

The TX-MX2R is part of the group of versatile TX series from Radio Design Labs. TX series feature the
advanced circuitry for which RDL products are known, combined with durable, quality connectors. The
ultra-compact TX series can be mounted in limited space using the adhesive methods popularized by
RDL’s STICK-ON
variety of mounting options available from RDL.

APPLICATION: The TX-MX2R is the ideal choice in installations requiring the active, isolated mixing of
two unbalanced line-level audio sources to feed either one or two unbalanced destinations.

The input circuits are high-impedance, line level (-10 dBV) and are each isolated from each other.
Therefore the modules may be used to bridge an unbalanced stereo source without affecting the stereo
separation. Each output from the TX-MX2R would be a mono mix of the stereo signal. Normally, the gain
trimmers are set to unity gain. If either channel is low, the gain of that channel may be adjusted up to
6 dB.

The TX-MX2R may also be used to mix two separate sources into a single output. The mixing circuit in
the module is an active summing amplifier.

The output driver provides two separate, identical output signals from the input signal(s). This output
distribution amplifier therefore allows the TX-MX2R to be used a two-output audio distribution amplifier. If
it is desired to distribute a single source to two destinations, one of the inputs may be left unused without
any loss of performance.

The TX-MX2R may be operated from any power supply voltage between 12 Vdc and 33 Vdc. The
module’s normal operating voltage is 24 Vdc. At operation from a 12 Vdc supply, the headroom remains
greater than 18 dB.

For unbalanced, connectorized 2-channel audio mixing and distributing, the TX-MX2R is the ideal choice.
Use the TX-MX2R individually, or combine it with other RDL RACK-UP
series audio or video modules as part of a complete audio/video system.

®

Series. The TX-MX2R may be mounted directly to a backboard or chassis using a

®

, STICK-ON, TX or FLAT-PAK™

RDL • 659 N. 6th St. • Prescott, AZ., USA 86301 • [phone] • FAX [phone] • www.rdlnet.com

TX™ SERIES

Model TX-MX2R
Audio Mixer / Distribution Amplifier

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

TYPICAL PERFORMANCE

Inputs Level: 2 @ -10 dBV
Input Impedance: 10 kΩ bridging
Noise: < -75 dB (referenced to -10 dBV)
THD+N: < 0.050% (0.010% typical)
Frequency Response: 25 Hz to 45 kHz (+/- 0.5 dB)
15 Hz to 70 kHz (+/- 1 dB)
Gain (per channel): Unity to +6 dB nominal (adjustable)
IMD: 0.010% typical
Outputs (2): 2 @ 100 Ω, -10 dBV to drive low or high impedance unbalanced lines
Headroom: > 27 dB (24 Vdc supply)
> 18 dB (12 Vdc supply)
Power: 24 to 33 Vdc @ 10 mA, Ground-referenced
12 Vdc (headroom remains greater than 18 dB)
Dimensions: Height: 1.4 in. 3.6 cm
Length: 3.0 in. 7.6 cm
Width: 1.2 in. 3.0 cm

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

891-0160B

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287