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Small black box with 3.5mm jacks on each end

METRA

METRA AGL3.5 1-Channel 3.5mm Ground Loop Isolator Noise Filter car electronics accessory

SKU CH-7JD6-BAAHF

Eliminates ground-loop noise from 3.5 mm audio sources in vehicles

  • Product typeGround Loop Isolators
  • Eliminates ground-loop hum by isolating audio grounds
  • Compact design fits tight spaces behind dash or console
  • Works with any device using a 3.5 mm audio jack
  • Passive filter requires no power source to operate

What this isolator does

The METRA AGL3.5 is a single-channel ground loop isolator with a 3.5 mm connector. It plugs between a portable audio source and a car stereo to break the ground path that causes hum or buzz. The compact housing fits easily behind a dashboard or inside a console. It is intended for drivers who hear alternator whine or system noise when an auxiliary device is connected.

Practical limits of the 3.5 mm connection

The isolator only works with equipment that uses a 3.5 mm audio jack. Devices that rely on USB, Bluetooth or proprietary digital links cannot be connected. It handles one stereo channel pair, so multi-channel or balanced signals are not supported. The unit does not amplify the signal; it simply isolates the grounds to reduce noise by isolating ground loops.

How it compares

Measured against everything we stock in Car Audio Accessories & Wiring, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 92% of the 2,768 comparable items (median $21.99).

Specifications

Product
Product typeGround Loop Isolators

Questions about this item

Should I choose this 3.5 mm version or a different connector type?

This model uses a 3.5 mm connector, so pick it when your source or amplifier has a matching 3.5 mm jack.

How much noise reduction will I hear once the isolator is installed in my car?

It breaks the ground loop between the 3.5 mm source and the amplifier, removing the alternating-current hum that rides on the shared ground.

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