Ground Loop Noise Isolator Effectively Eliminates Audio Noise for Car Stereo System Home Speaker with 3.5mm Audio Cable

That whine rising and falling with the engine, or the steady hum that starts the moment a phone is plugged into the aux socket and the charger at once, is not the stereo failing. It is a ground loop: two devices earthed at slightly different potentials, with the difference leaking into the audio line as noise.

Where it goes in the chain

The isolator sits inline on the 3.5 mm run between source and stereo. Phone or Bluetooth receiver into one end, aux socket into the other. It breaks the shared earth path while letting the audio signal pass, which is why the hum stops without unplugging the charger or rewiring anything. No power lead, no app, nothing to set up.

Small enough to leave connected

At roughly 5.1 cm long and 1.5 cm across, weighing about 28 g, it hangs off the aux socket without loading the jack or fouling the gear lever. The supplier lists compatibility as any portable device with a 3.5 mm audio jack, in car stereos or home systems, including feeding a Bluetooth receiver's output into the head unit.

Key features

• Inline 3.5 mm: fits between any aux source and the stereo without adapters.
• No power required: nothing to charge and nothing to switch on.
• Targets ground-loop hum: the buzz that appears when source and stereo share a supply.
• Car or home: works equally on a home stereo or a Bluetooth receiver feed.

Specifications

• Connections: 3.5 mm in, 3.5 mm out
• Dimensions: approx. 5.1 x 1.5 x 1.5 cm (supplier states 2.01 x 0.59 x 0.59 in)
• Weight: approx. 28 g (supplier states 0.99 oz)
• Power: none required
• Included cable: the title lists a 3.5 mm audio cable; the supplier's detail text does not confirm pack contents
• Frequency response and signal-to-noise figures: not published by the supplier

If the noise only shows up while the phone is charging, try this before chasing earth straps around the car.

Returns, Refunds and Replacements

Products that are received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with the Australian Consumer Law (ACL). We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. However, please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.

Delivery Timeframe

Please note that we cannot guarantee the exact date of arrival, and the delivery timeframes (excluding weekends and public holidays) are as follows:

• For customers in Victoria, approximately 7-10 working days;
• For customers in NSW, SA, ACT, and QLD, approximately 9-12 working days;
• For customers in WA, NT, and TAS, approximately 9-12 working days.