Palmer ABI – balanced line input switcher

Palmer ABI is a practical, passive line input switcher designed for sound engineers, musicians, technicians, and installers who need fast, silent, and reliable switching between two audio sources. The unit allows you to switch two XLR inputs to a single XLR output, making it ideal for comparing signals, selecting between microphones, switching line-level sources, or performing A/B testing in studio, live, and installation environments.

Product features

The key advantage of this unit is the ability to switch between two balanced inputs without audible clicks or noise. It supports both microphone and line signals, while built-in attenuation switches help match different signal levels. Input A can be attenuated by 15 dB, while Input B offers 6 dB, 15 dB, or 21 dB attenuation. This makes it easy to balance signal levels and perform accurate comparisons.

The Ground Lift switch helps eliminate hum and ground loop issues often encountered in complex audio setups. A red LED clearly indicates the active input, improving workflow in live environments. The device operates passively, and the 9V battery powers only the LED indicator, ensuring a clean and stable audio path.

Professional control of two audio sources in one signal path

This input switcher is designed for situations where speed, reliability, and durability matter. It can be used to compare microphones during soundchecks, switch between main and backup signals, select between two line sources, or test different setups without reconnecting cables. It significantly simplifies workflow by reducing the need for manual patching.

The rugged metal housing with extended side panels protects connectors from mechanical damage. Powder coating enhances durability, while mounting holes allow easy installation in racks, flight cases, or pedalboards. Despite its compact size, the unit delivers powerful functionality for managing balanced signals.

Standard XLR connectors ensure seamless integration into existing setups. Whether used as a permanent installation or a portable tool, it reduces setup time, minimizes errors, and improves signal management efficiency.

The result is a compact yet powerful signal control device that enhances flexibility without adding complexity.

Applications

This switcher is ideal for live sound systems, recording studios, control rooms, rehearsal spaces, fixed installations, and mobile setups. It can be used to switch between microphones, line sources, main and backup signals, or different audio configurations.

Technical specifications

• Product type: audio switcher
• Switching function: input switcher
• Channels: 2
• Inputs: 2
• Input connectors: XLR
• Outputs: 1
• Output connector: XLR
• Controls: ground lift, input pad
• Input A attenuation: 15 dB
• Input B attenuation: 6 dB, 15 dB, 21 dB
• Power supply: 9V battery (LED only)
• Housing material: steel
• Width: 100 mm
• Depth: 120 mm
• Height: 60 mm
• Weight: 0.69 kg
• EAN: 4049521133107

Materials and construction

The enclosure is made of durable steel for maximum resistance during transport and live use. Extended side panels protect the connectors, while powder coating improves durability and gives a professional look.

What’s included

• Palmer ABI balanced line input switcher

Summary

This compact unit solves many everyday signal routing challenges. It offers silent switching, level adjustment, Ground Lift functionality, clear LED indication, and rugged construction. If you need a reliable and easy-to-use tool for switching between two balanced audio sources, Palmer ABI is an excellent choice for studio, live, and technical setups.