Detail 01
Signal isolation
Passes audio while breaking the ground connection, which removes the loop that causes 60-cycle hum.
Product detailSKU #1274034477461
Rapco HorizonISOBLOX Compact Signal Isolator
Independent shopping perspective
The Korena take
A compact inline signal isolator. Breaks the electrical path between two pieces of gear to kill hum and buzz caused by ground loops.
Strong match
Who this is for
- Hum when an amp and mixer share a signal path
- Splitting a guitar to two amps on different circuits
- Cleaning up buzz between a laptop or player and a PA
Consider the trade-offs
When to look elsewhere
- Players with no noise problem — it solves nothing then
- Anyone needing preamp gain; it does not amplify
- Speaker-level connections between an amp head and cabinet
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
Compact inline design
Sits between two cables instead of taking a rack space or pedalboard slot.
Detail 03
Passive operation
No battery or phantom power. Nothing to fail mid-set, nothing to remember to charge.
Detail 04
No gain stage
Level stays roughly the same or drops slightly. Make up any loss at the mixer or amp input.
Detail 05
Fixed inline box, no controls
Nothing to set. It either fixes the noise or the noise came from somewhere else.
Final check
Know before you order
- 01No cables included; you supply both sides of the connection
- 02Confirm the hum is a ground loop first — bad cables and dimmers mimic it
- 03Isolation can slightly soften level; leave headroom at the destination
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will this fix my hum?
It fixes hum caused by a ground loop between two grounded devices. It will not help with a noisy pickup, a bad cable, or lighting interference.
02Does it need power or a battery?
No. It is passive and works inline with no power supply.
03Where does it go in the chain?
Between the two devices that are fighting each other, usually right before the input of the second device.
04Can I use it on a speaker output?
No. It is for instrument and line-level signals only. Speaker-level output will damage it.
