# AAL - HumFree Stereo Isolator

Passive stereo audio isolator designed to eliminate hum, buzz and ground loop noise.

- **Seller:** [Analog Audio Lab's store](https://lectronz.com/stores/aalab), LES MONTS D AUNAY, Calvados, France
- **Price:** €85.00 (EUR, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Audio, Amplifier
- **Country of origin:** France
- **Product page:** https://lectronz.com/products/aal-humfree-stereo-isolator

## Images

![AAL - HumFree Stereo Isolator](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzA5MDUsInB1ciI6ImJsb2JfaWQifX0=--4b17c1e54eca072222d4360c6300b308cf4b82cf/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/IMG_20260418_094754.jpg)
![AAL - HumFree Stereo Isolator](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzA5MDksInB1ciI6ImJsb2JfaWQifX0=--695ce9e7178f18da7c1c8cde5d22d1037c2c2f9f/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/IMG_20260418_094709.jpg)
![AAL - HumFree Stereo Isolator](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzA5MTMsInB1ciI6ImJsb2JfaWQifX0=--dc6c64598bda1d205bac31ec4090899e5a2af79c/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/IMG_20260418_094739.jpg)
![AAL - HumFree Stereo Isolator](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzA5MTcsInB1ciI6ImJsb2JfaWQifX0=--ee5945904c119aab5534387100b8dca71cfd16eb/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/IMG_20260418_101736.jpg)
![AAL - HumFree Stereo Isolator](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzA5MjEsInB1ciI6ImJsb2JfaWQifX0=--9e03b36b3d297199a7552b6e56538758e93a2917/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/IMG_20260418_101656.jpg)

## Description

##What is it?

Designed to preserve musicality and signal transparency, the **AAL – HumFree Stereo Isolator** is a passive audio isolation device that eliminates hum, buzz and noise caused by ground loops.

- Eliminates hum, buzz and digital interference
- Preserves audio clarity and transparency
- Passive design — no power supply required

**Connectors**

- Input: Stereo RCA + 3.5 mm jack
- Output: Stereo RCA

##Why did you make it?

Laptop chargers, DACs, TVs, phones and other modern devices often introduce unwanted noise into audio systems.

HumFree was created to provide a simple, passive and effective solution for eliminating those ground loop problems without altering the listening experience.

**Typical Applications**

- DAC to amplifier isolation
- Laptop and phone audio cleanup
- Studio monitoring setups
- DJ equipment
- Home Hi-Fi systems
- TV audio hum removal
- Active speakers
- Live sound rigs

##What makes it special?

Cable Mode (SHORT / LONG)

- LONG mode improves stability when using long audio cables
- SHORT mode (default) provides the most direct signal path for short cable runs

HF LINK

- Improves high-frequency interference suppression in difficult electrical environments.

Both options are configurable using tool-free internal jumpers. Simply unscrew the two knurled screws to access the PCB.

##Why this price?

Built using carefully selected high-quality components (KYOCERA, Neutrik, Triad Magnetics, etc.) chosen for performance, reliability and long-term durability.

All parts are sourced from reputable suppliers to ensure quality and traceability.

## Who did it?

Designed, hand-assembled and individually tested in France by **AAL — Analog Audio Lab**.

*Practical electronics designed to solve real-world problems.*

[analog.audio.lab@gmail.com](mailto:analog.audio.lab@gmail.com)