RDL STMX3 Data Sheet

STICK-ON® SERIES

Model ST-MX3
Line Level Mixer

ANYWHERE YOU NEED...

•

Audio Mixing with Up To Three Inputs

•

Balanced or Unbalanced Inputs & Outputs

•

To Add Additional Inputs to an Existing Mixer

•

To Combine Signals of Different Level,
Impedance, or Bal./Unbal. Configuration

•

Low Noise and Low Distortion Performance

You Need The ST-MX3!

The ST-MX3 is part of a group of products in the STICK-ON series from Radio Design Labs. The
durable bottom adhesive permits quick, permanent or removable mounting nearly anywhere or it may be
used with RDL’s racking accessories. The ST-MX3 gives you the advantage of a high performance
audio mixer with a big PLUS, you can put it where you need it, and you can combine modules to build
larger mixing systems using whatever combination you need!

APPLICATION: The ST-MX3 is a three-channel audio mixer for combining line-level signals to a line­level output. Individual level control is provided for each input. Each input features a separate
preamplifier circuit, which isolates it from the other inputs. A trimpot gain adjustment is provided for each
of the three input preamps. Signals from the three preamps are actively summed and fed to the output
line-level driver amplifier. The line-input circuit design of the ST-MX3 allows the inputs to accept either
balanced to unbalanced signals, or either high or low impedance. The output capable of driving into
either high or low impedance, balanced or unbalanced loads. Each output may be connected in parallel
with other ST-MMX3s, ST-MX3s, or ST-MLX3s to form a multi-channel mixer to fit nearly any installation!
The ST-MX3 features dc amplifier circuitry which produces the unsurpassed pure clarity for which Radio
Design Labs products are known! Some features are:

• Ultra-low Distortion

• Ultra-low Noise

• Input Levels Individually Adjustable

• Ample Headroom at Operating Level

• Full Operation in either High or Low Impedance Circuits

• Outputs Short-Circuit Protected

• Positive Connections via Barrier Block, No Audio Connectors to Wire

Wherever a line level mixer is needed, the ST-MX3 is the ideal choice. Use the ST-MX3 combined with
other RDL RACK-UP®, STICK-ON, TX™, or FLAT-PAK™ series products as part of a complete
audio/video system.

RDL • P.O. Box 1286 • Carpinteria, CA., USA 93014 • [phone] • FAX [phone] • http://www.rdlnet.com

STICK-ON® SERIES

Model ST-MX3
Line Level Mixer

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: 3 @ > 30 kΩ balanced or
unbalanced bridging
Input Signal: -20 dBu to +18 dBu (for +4 dbu output)

-24 dBu to +14 dBu (for 0 dBu output)
Output: 400 Ω to drive low or high impedance

Output Signal: +4 dBu nominal, adjustable unbalanced
output 6 dB below balanced line level
THD: < 0.03% (below +4 dBu 10 Hz to 20 kHz)
Frequency Response: 10 Hz to 20 kHz +/- 0.50 dB

891-0008J

balanced or unbalanced lines

Radio Design Labs Technical Support Centers

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

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

Noise below +4 dBu: < -80 dB (all inputs @ unity gain)
< -80 dB (all inputs @ 10 dB gain)
< -75 dB (all inputs @ 20 dB gain)
Headroom: 22 dB
Gain (each input): Adjustable from -14 dB to +24 dB
CMRR: > 50 dB at 60 or 120 Hz
Multiple Module System Loss:
6 dB with two module outputs paralleled
10 dB with three module outputs paralleled
12 dB with four module outputs paralleled
Supply Input: 24 to 33 Vdc @ 55 mA, Floating