RDL STSX4 Specifications

STICK-ON® SERIES

Model ST-SX4
4 Input Audio Switcher

ANYWHERE YOU NEED...

• To Select One of Four Audio Sources

• Audio Selection from Remote Location

• Remote Switching from Single Control Pair

• All Solid-State Audio Switching

• Slave Capability for Stereo Switching

You Need The ST-SX4!

APPLICATION: The ST-SX4 is a remote-controllable unbalanced audio source selector in the group of
STICK-ON series products by Radio Design Labs. These products are designed for quick, convenient
installation and reliable operation in a variety of audio applications.

The ST-SX4 accepts up to Four unbalanced audio sources. Any of these sources may be selected to
feed the output, or all sources may be switched off. The output from the ST-SX4 is unbalanced. Control
of the module is accomplished through a single input terminal. Connection of a specified resistance
between the control input and ground causes the desired input to be switched on. If no control input is
connected, the ST-SX4 defaults to input #4. If the control input is shorted to ground, all inputs are
switched off.

Use of a single-pair for control allows a minimum of wire to be installed. Installers may use a variety of
remote switches; rotary, pushbutton, toggle, etc. The three resistors needed are provided with the
module. The ST-SX4 may conveniently be used with the RDL VCA modules to provide both remote
switching and remote volume control. In this case, it is necessary to provide only a single-pair-shielded to
control both modules (1 conductor to control the ST-SX4, 1 conductor to control the RDL VCA modules,
shield to provide control ground path). Two ST-SX4 modules may be used together for stereo switching.

In a wide variety of unbalanced audio switching applications, ST-SX4 affords minimum size, maximum
flexibility, low-noise audio clarity and cost-effectiveness for which Radio Design Labs products are known!

Wherever an unbalanced source selector is needed, the ST-SX4 is the ideal choice. Use the ST-SX4
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-SX4
4 Input Audio Switcher

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

Input/Output Level: -10 dBv
Control Input Resistance: 10 kΩ (pullup to +15 Vdc
Gain: Unity
Headroom: 23 dB
THD+N: < 0.1% Typ 0.05%
Frequency Response: 15 Hz - 40 kHz +/- 0.5 dB
Input Impedance: 100 kΩ, Unbalanced
Output Impedance: < 50 Ω, Unbalanced
Crosstalk: Below Noise Floor
Off-Channel Attenuation: > 85 dB @ 1 kHz
>80 dB @ 10 kHz
>75 dB @ 20 kHz
Residual Noise: <70 dB below -10 dBv
Control Input: Single terminal to be connected to ground terminal to select desired channel
Input Selected Resistance Value
None 0 Ω (short to ground)
1 2.7 kΩ
2 6.8 kΩ
3 22.0 kΩ
4 None
Control Output: Slave Output terminal may be attached to other ST-SX4s
Power Supply: 24 to 33 Vdc @ 35 mA, Ground-referenced

891-0036J

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

Radio Design Labs Technical Support Centers

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