The LD Systems LDPRE ST 1 is a 4-channel multi-functional stereo mixer preamplifier that allows users to mix 2 microphone/line sources together with an emergency line input and one of the 3 music sources available, including a Bluetooth receiver.

A four-level priority system combines contact closure inputs and VOX audio detection circuits for muting of non-priority signals during announcements or emergency calls.

LDPRE ST 1 is equipped with two priority contacts: one for the emergency input, which mutes all the other signal sources, and one for the microphone inputs, which mutes the music signal sources.

The stereo balanced line output includes a mono/stereo switch and separate tone controls for bass and treble.

Switchable automatic standby is available to reduce energy consumption by powering down after 20 minutes of no signal.

The intuitive control panel ensures easy operation, with input and master volume controls, clear signal level and priority indications. Music source selection and Bluetooth pairing are selected via capacitive buttons.

The rear panel is neatly laid out and clearly labelled for easy installation.

Half rack width, 2U high (without feet): rack mountable with the optional LDIMA RK rack mount kit.

• Line input for emergency signal with priority contact closure
• 2 switchable Mic/line inputs & switchable 24-V phantom power
• Priority contact closure and switchable chime function for mic/line channels
• 3 stereo music sources: 2 line inputs plus Bluetooth 4.0 interface
• Gain control and clip LED indicator for emergency and mic/line inputs
• Balanced stereo line output with terminal block connector, and a mono/stereo switch
• Separate treble and bass tone controls on the rear panel
• 4 priority settings
• Switchable auto standby mode
• User-friendly front panel control & rear panel layout