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Radio Design Labs ST-SX4
4-Channel Audio Switcher

OUR PART #:  STSX4

Radio Design Labs' ST-SX4 is a remote-controllable unbalanced audio source selector in the group of STICK-ON series products by Radio Design Labs.
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List Price: $140.24
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Radio Design Labs ST-SX4
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Radio Design Labs' 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 4 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.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.

Use of a single-pair cable for control allows a minimum of wire to be installed. Installers may use a variety of remote switches; rotary, push button, toggle, etc. The three resistors are provided with the module. The ST-SX4 may conveniently be used with the ST-VCA2 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 ST-VCA2, shield to provide control ground path). Two ST-SX4 modules may be used together for stereo switching.

Audio Specifications:

  • In/Out Level: -10 dBV
  • Gain: Unity
  • Headroom: 23 dB
  • THD: less than 0.100%, Typ. 0.050%
  • Frequency Response: 15 Hz - 40 kHz (+/- 0.5 dB)
  • Input Impedance: 100 kohm, Unbalanced
  • Output Impedance: less than 50 ohm, Unbalanced
  • Crosstalk: Below Noise Floor
  • Off-Channel Attn:
        * greater than 85 dB @ 1 kHz
        * greater than 80 dB @ 10 kHz
        * greater than 75 dB @ 20 kHz
  • Residual Noise: less than 70 dB below -10 dBV
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