Detail 01
Passive
No power supply, no battery, nothing to fail mid-show. It also cannot add level, only pass or lose a little.
Product detailSKU #1274228072064
Radial EngineeringTWIN ISO Passive Line-Level Isolator
1/5
Independent shopping perspective
The Korena take
Passive two-channel line-level isolator for killing ground-loop hum between gear. For studio and live techs joining systems that buzz when connected.
Strong match
Who this is for
- Stereo feeds between devices on different power circuits
- Splitting a mix to a recorder while hum-free
- Permanent install racks where a buzz appeared after wiring
Consider the trade-offs
When to look elsewhere
- Instrument-level pickups feeding an amp — this expects line level
- Anyone needing phantom power or gain — it is passive
- Buzz caused by bad cables or dimmers, not ground loops
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Isolator, not a DI
It breaks the ground path between two devices. It does not convert impedance for guitars, basses or keys.
Detail 03
Line-level
Feed it outputs from mixers, interfaces, players or amp sends. Mic and instrument signals are too low to work here.
Detail 04
Twin (two channels)
Handles a stereo pair or two independent mono paths in one box, so one unit covers a full L/R feed.
Detail 05
Signal processor, not an effect
It changes nothing you hear except the hum. Tone stays as it went in.
Final check
Know before you order
- 01Confirm the hum is a ground loop before buying — swap cables and outlets first
- 02Cables are separate; check whether your gear ends are TRS, TS or XLR
- 03Passive transformers pass signal, they do not boost it
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will this fix my hum?
If the hum appears only when two powered devices are connected together, and goes away when you unplug one, that is a ground loop and this is the fix.
02Can I use it with a guitar?
No. A guitar is instrument level and needs a DI box. This is built for line-level outputs from mixers, interfaces and players.
03Does it need power?
No. It is passive and runs on the signal passing through it, so there is no adapter, no battery and nothing to switch on.
04Is it stereo?
Yes, two channels in one box. Use it for a stereo left/right pair, or as two separate mono isolators.
