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Small black box with gold RCA plugs and sockets

JacobsParts Inc.

JacobsParts AFILTER-C 2-Channel RCA Ground Loop Isolator 50W

SKU CH-8FCB-106E6

Eliminates ground-loop hum and buzz between audio sources and amplifiers with a passive in-line design, gold-plated connectors and 50 W rated input

  • TypeIsolator
  • FeaturesEliminates humming and buzzing due to ground loop issues
  • Eliminates ground-loop hum and buzz with passive in-line filtering
  • Blocks DC current on the signal path for cleaner audio
  • Gold-plated RCA connectors resist corrosion and maintain signal integrity
  • Handles 50 W rated input and 100 W peak power
  • Simple connection between source and amplifier with male and female RCA plugs

Ground-loop isolator for car audio

The JacobsParts AFILTER-C is a passive in-line device that sits between a head unit and an amplifier or equaliser. It uses gold-plated RCA male and female connectors to break the ground path that causes audible hum and buzz. The unit handles a rated input of 50W and peaks at 100W without requiring external power. It is built for stereo systems where ground-loop noise degrades sound quality.

Passive operation keeps thermals simple

Because the isolator contains no active circuitry it generates no measurable heat and draws no current from the vehicle electrical system. There are no fans, pumps or switching components, so acoustic noise is entirely absent. The gold-plated contacts maintain low resistance over time, ensuring the signal path stays clean without adding thermal load to the installation.

Gold-plated RCA connectors only

The package supplies the isolator itself with two male and two female RCA plugs; no cables, adapters or mounting hardware are included. Installers must provide their own interconnects and a suitable mounting location. The lack of active electronics means no firmware, drivers or configuration software exist for this device.

Highlights

  • Eliminates ground-loop hum and buzz with passive in-line filtering
  • Blocks DC current on the signal path for cleaner audio
  • Gold-plated RCA connectors resist corrosion and maintain signal integrity
  • Handles 50 W rated input and 100 W peak power
  • Simple connection between source and amplifier with male and female RCA plugs

Specifications

BrandJacobsParts
ModelAFILTER-C
TypeIsolator
FeaturesEliminates humming and buzzing due to ground loop issues

Questions about this item

How do I install this isolator between my head unit and amplifier, and which connection step do people often get wrong?

Connect the male RCA plugs to the head-unit outputs and the female RCA jacks to the amplifier inputs; the common mistake is reversing source and load so the filter sits on the wrong side of the signal chain.

What maintenance or replacement will the AFILTER-C need after extended use?

As a passive in-line device with no moving parts or consumable components, it requires no scheduled maintenance and no periodic replacement under normal conditions.

At what power level does the isolator reach its limit during sustained playback?

The unit is rated for 50 W continuous input, so sustained signals above that level will hit the thermal and distortion limit first.

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