Detail 01
Jensen transformers
The transformer is the whole point here. It sets how clean the low end and top stay through the isolation.
Product detailSKU #1274228072007
Radial EngineeringJ-ISO Jensen Transformer Equipped Stereo Isolator +4dB to -10dB Converter
1/5
Independent shopping perspective
The Korena take
A two-channel isolator with Jensen transformers that matches +4dBu gear to -10dBV gear and breaks ground loops. For studio and install signal chains.
Strong match
Who this is for
- Killing hum when consumer gear meets pro gear on different circuits
- Feeding a -10dBV recorder or playback deck from a +4dBu console
- Permanent installs where two rooms or racks share one signal path
Consider the trade-offs
When to look elsewhere
- Single mono sources — you'd be paying for a channel you don't use
- Anyone whose gear already runs the same level standard and shares a ground
- Budget setups where a cheaper single-channel isolator solves the problem
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
Stereo, two channels
Handles a left/right pair in one box. Both channels pass through matched isolation.
Detail 03
+4dB to -10dB conversion
Drops pro-level output to consumer level so the receiving gear isn't overdriven and distorting.
Detail 04
Isolation, not just padding
Transformers break the ground path between devices, which is what actually stops hum a simple pad won't.
Detail 05
Passive transformer design
No power supply in the signal path, so nothing to plug in and no wall wart noise to add.
Final check
Know before you order
- 01Confirm your problem is level or grounding — this fixes both, but not either alone cheaply
- 02Check connector types on both ends and buy cables to match
- 03One box covers one stereo pair; multiple sends need multiple units
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will this fix my hum problem?
If the hum comes from a ground loop between two pieces of gear, the transformers break that loop. Hum from bad cables or lighting dimmers needs a different fix.
02What does +4 to -10 conversion actually do?
Pro gear runs about 12 dB hotter than consumer gear. This drops the level so the receiving device sees a signal it can handle without clipping.
03Can it go the other way, -10 to +4?
This unit is specified as a +4dB to -10dB converter. If you need to raise consumer level to pro level, look at a box built for that direction.
04Does it need power?
It's a transformer-based passive design, so there's no supply to plug in.
