LD Systems PRE ST 1 – 4-Channel Stereo Mixer Preamplifier

The LD Systems PRE ST 1 is a 4-channel multi-functional stereo mixer preamplifier designed specifically for permanent and commercial audio installations where reliability, priority handling, and discreet design are essential.

It allows seamless mixing of two microphone/line inputs, an emergency line input, and three selectable music sources, including Bluetooth 4.0. A flexible four-level priority system, combining contact closures and VOX audio detection, ensures critical announcements and emergency signals automatically override lower-priority audio sources.

The PRE ST 1 is equipped with priority contacts that mute non-essential signals during announcements or emergency situations, making it ideal for retail, hospitality, corporate, education, and public address environments. A balanced stereo line output with mono/stereo switching, rear-panel tone controls, and automatic standby mode complete a highly efficient and installer-friendly solution.

Key Features

• 4-channel stereo mixer preamplifier for installation use

• Emergency line input with priority contact closure

• 2 mic/line inputs with mic/line switching

• Switchable 24 V phantom power on mic/line channels

• Priority contact closure and switchable chime function

• 3 music sources:

  • 2 × stereo line inputs (RCA)

  • Bluetooth 4.0 audio interface

• Gain control and clip LED indicators on emergency and mic/line inputs

• Balanced stereo line output with mono/stereo switch (terminal block)

• Separate bass and treble tone controls on rear panel

• 4 priority levels for flexible system integration

• Auto standby mode for reduced power consumption

• Intuitive front-panel controls and clear rear-panel layout

• Compact 9.5″ format for easy installation

Applications

• Commercial audio systems

• Retail and hospitality venues

• Education and corporate facilities

• Paging and background music systems

• Emergency and announcement systems

Notes

• Mixer preamplifier only

• Designed for permanent installation

• Power supply and accessories as per manufacturer specification