Palmer

Palmer River – Passive 2-Channel Line Insulation Box

Name: Palmer River – Passive 2-Channel Line Insulation Box
Brand: Palmer
SKU: SB-MMDOXEZW-ASAF
Price: 80.0 EUR
Availability: InStock

Tested and listed on 5 Mar 2026 4.9/5 (790 reviews)

€80,00 New price €106,00

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Palmer River – passive line insulation box against hum

The Palmer River interrupts ground connections between audio devices using two isolation transformers. This eliminates ground loops – without power supply.

The device provides galvanic isolation per channel. In practice, this means: compensation currents via the audio lines are stopped, eliminating hum and high-frequency 'crackle'. However, this is a specific troubleshooting tool – you only use it when noise occurs between source and amplifier.

The inputs and outputs are RCA connectors, standard for hi-fi and consumer equipment. The housing is made of aluminium and steel for durability. An erasable tour label is included for professional use.

Key specifications

Type – passive 2-channel line insulation box
Isolation – galvanic via transformers
Connections – 2 RCA inputs, 2 RCA outputs
Power supply – not required

Specificaties

TypePassieve 2-kanaals lijnscheidingsbox

VoedingGeen voeding nodig

BehuizingAluminium en staal

Aansluitingen2 RCA-ingangen, 2 RCA-uitgangen

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Palmer River Passive 2-Channel Line Insulation Box – a passive solution for ground loops

The Palmer River Passive 2-Channel Line Insulation Box is built around galvanic isolation – and that defines everything. When connecting a media player or laptop to a hi-fi or sound system, noise such as hum or high-frequency 'crackling' can occur. This box reliably eliminates such interference by breaking the ground connection between your devices. It is a passive 2-channel line isolation box that requires no power supply. This makes it a simple, yet effective problem solver for your audio setup.

Galvanic isolation and the transformer principle

The core of the solution lies in the two isolation transformers. The cause of the interference – often different ground potentials causing compensation currents via the audio lines – is addressed here. Each transformer provides galvanic isolation per channel. This means the electrical signal is transferred magnetically, while the direct electrical connection – and with it the ground loop – is broken. The result is a clean signal transfer without the need for additional power. The trade-off of a passive transformer solution is inherent: there is a minimal attenuation of the signal, but the River is designed to keep this loss as small as possible and leave the sound unaltered.

Under the hood

Two-channel construction – for full stereo separation of left and right.
Galvanic isolation via transformers – breaks ground loops and eliminates hum.
2 RCA inputs & 2 RCA outputs – compatible with standard hi-fi and consumer equipment.
No power supply needed – plug-and-play installation without extra adapters or power outlet.
Robust aluminium and steel housing – provides mechanical protection and shielding.
Includes writable tour label – for identification in professional setups.

Productbeeld van de fabrikant · niet dit exacte exemplaar

Design and robust materials of the line isolation box

The housing is constructed from aluminium and steel. This material choice not only contributes to robustness but also helps shield against any external interference. The construction is purely functional, focused on reliability in various environments. All connections are RCA ports, the universal standard for line-level audio in consumer environments. The design is compact and utilitarian – it remains unobtrusive in your installation.

Daily use and practical applications

The Palmer River can be deployed individually in scenarios where unwanted hum occurs. Think of a laptop connected to an amplifier for music playback, or a media player in a hi-fi system. It is a handy solution for hi-fi, car audio, presentations, and fixed installations. The box is not suitable for amplifying signals – it is a passive isolation component. It is also specifically for unbalanced lines with RCA connectors; for professional gear with balanced XLR or TRS connections, you look elsewhere. You simply place it in the signal chain between source and amplifier.

The construction with two separate transformers ensures the stereo image remains intact.