Audio Control BLX-1K

Out of stock. Contact us to check delivery times

Where to buy


Balanced line driver/receiver

Professional A/V installers often encounter projects that require long cable runs, and the BLX-1K has been engineered as a premium, simple solution to efficiently address these challenges. The BLX-1K is a signal extender that sends and receives a fully balanced, noise-rejecting, analog audio signal up to 1000 feet over standard Cat5/6 cable.

Designed to be used in pairs at both ends of the signal path, each BLX-1K contains a 2-channel receive stage as well as a 2-channel transmit stage, enabling audio to travel in both directions across a span of standard Cat5/6. Once wired connections are made, the A/B button on one unit is pressed to reverse the signal path. Signal gain can then be set to complete the installation. The BLX-1K comes equipped with a 24 VAC transformer for easy connection and ultra-quiet performance.

The BLX-1K delivers a stout output of nearly 8 Volts RMS with an exceptionally low noise floor, providing a pure, crystal clear audio signal over long Ethernet runs—the ultimate problem-solver for A/V installers.



  • Send/receive high quality audio up to 1000 feet
  • High gain, low noise outputs
  • Simple connection with one-button setup
  • Supports standard Cat5/6 cable
  • Separate balanced line driver and receiver stages
  • Independent gain and attenuation controls
  • Ground lift option (when using shielded Cat5/6)
  • Integrated mounting brackets



  • Unbalanced Inputs (RCA): 2
  • Unbalanced Input Impedance: 100 kΩ
  • Maximum Unbalanced Input Signal Level: 3.8 Vrms
  • Balanced Inputs (Cat5/6): 1 (2 channel)
  • Balanced Input Impedance: 200 kΩ


  • Unbalanced Outputs (RCA): 2
  • Unbalanced Output Impedance: 150 Ω
  • Maximum Unbalanced Output Signal Level: 7.5 Vrms max
  • Balanced Outputs (Cat5/6): 1 (2 channel)
  • Balanced Output Impedance: 150 Ω
  • Maximum Balanced Output Signal Level: 15 Vrms max


  • Frequency Response: 20 Hz – 20 kHz, ± 1 dB
  • Signal to Noise: >100 dB (ref. full output =  7.5 Vrms)
  • Total Harmonic Distortion: 0.1%
  • Headroom: 8.5 dB
  • Channel Separation: 90 dB (1 kHz)
  • CMRR: >69.5 dB (1kHz)


  • Power Supply: 24 VAC
  • Current Draw: 50 mA

Weights & Dimensions

  • Dimensions: 6.2”W x 4.3”D x 1.0”D
  • Weight: 1.0lbs (0.5kg)

in the box: BLX-1K, AC Adapter, Manual, Warranty