⚠️ Important Notice: Ground Loop Noise Compatibility & Signal Limitations

1. Ground Loop Noise Only: This isolator specifically eliminates buzzing, hissing, and electrical hum caused by ground loops (which typically occur when the audio source and the speaker/amplifier share the same power supply, such as in car audio systems or shared wall outlets). It cannot eliminate static or noise caused by defective audio cables, poor Bluetooth compression, damaged speakers, or noisy audio files.
2. Stereo Audio Only (No Mic / In-Line Controls): Features standard 3-pole (TRS) 3.5mm connectors for left and right audio channels. It does NOT support 4-pole (TRRS) microphone signals, headset talk-back, or in-line remote control buttons.
3. Passive Filter (No Battery or Power Needed): Operates as a passive audio transformer without requiring charging, batteries, or external power. A slight, normal passive signal insertion attenuation may occur depending on system impedance, which can be compensated by adjusting the volume.
4. Bi-Directional Connection: The integrated 3.5mm male plug and 3.5mm female jack support bi-directional passthrough; you can plug either side into your audio source or speaker system.

Product Overview

The BG02 Ground Loop Noise Isolator is an instant, plug-and-play audio accessory engineered to eliminate the persistent buzzing, whining, and electrical hum commonly encountered in car audio and home stereo systems. Featuring an integrated 3.5mm male pigtail cable and a compact inline isolation transformer housing with a 3.5mm female jack, it breaks the ground loop electrical path between your audio source and amplifier while preserving full-frequency stereo sound without requiring batteries or power adapters.

Key Features

• Targeted Ground Loop Buzz Elimination: Effectively cleans up alternator whine, power supply hiss, and electrical hum in automotive and home stereo setups where audio source and speakers share a common ground.
• Integrated Pigtail Cable Design: Equipped with a built-in 13–15 cm (5.1–5.9 in) flexible 3.5mm male cable and a female 3.5mm port on the isolator body, allowing immediate inline connection without purchasing extra cables.
• Passive Plug & Play: Utilizes dual high-performance internal audio transformers that require no external power, battery charging, or software drivers.
• Full-Frequency Stereo Transmission: Delivers clean, undistorted stereo audio across a wide 20Hz to 20kHz frequency response range with output signals exceeding 0.8Vrms.
• Bi-Directional Audio Passthrough: Symmetrical passive design allows either end to serve as the input or output for flexible, hassle-free installation.
• Ultra-Compact & Pocket-Sized: Slim body measuring just 62 x 21 x 15 mm makes it easy to tuck away behind car dashboards, inside glove boxes, or behind desktop speakers.

Compatible Devices

• Audio Sources: Smartphones, tablets, laptops, desktop computers, MP3/MP4 players, CD players, and USB-powered 3.5mm Bluetooth audio receivers or dongles.
• Sound & Speaker Systems: Car stereos, vehicle audio systems with 3.5mm AUX inputs, home stereo systems, bookshelf speakers, soundbars, amplifiers, and stereo headphones.

Note: This compatibility list is not exhaustive. Compatible with other standard audio equipment equipped with 3.5mm AUX or LINE audio ports.

Common Daily Applications

• Car Bluetooth Receiver Setup: Eliminates alternator whine and electrical hum when using a USB-powered Bluetooth audio receiver plugged into a car cigarette lighter charger and AUX port simultaneously.
• In-Car Phone Charging & Music: Stops buzzing when simultaneously fast-charging your smartphone and streaming music through your vehicle AUX input.
• Desktop PC & Studio Monitors: Eliminates motherboard ground noise and graphics card buzzing when connecting PC audio to powered desktop speakers.
• Home Theater Systems: Cleans up audio interference between AV receivers, televisions, and external audio players connected to shared wall power strips.

Specifications

Frequently Asked Questions FAQ

Q: Will this isolator eliminate all buzzing or hissing in my car audio system?
A: It will eliminate buzzing, hissing, and whining specifically caused by ground loops (common ground interference when the audio source and speaker share the same power circuit). It cannot fix noise caused by defective audio cables, poor radio reception, Bluetooth signal compression, or damaged speaker cones.

Q: Does this device need to be charged or connected to USB power?
A: No. It operates entirely passively using built-in audio transformers to filter out ground loop currents. Simply plug it inline between your audio source and speaker.

Q: Can I use this with a headset for voice calls or gaming?
A: This device is designed for 3-pole (TRS) stereo audio listening only. It does not pass through 4-pole (TRRS) microphone signals or headset button controls.