RapcoHorizon BLOX Series Inline XLR Isolator 1-channel Line Isolator

Inline Signal Isolator
RapcoHorizon BLOX Series Inline XLR Isolator 1-channel Line Isolator image 1
RapcoHorizon BLOX Series Inline XLR Isolator 1-channel Line Isolator image 1
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RapcoHorizon BLOX Series Inline XLR Isolator 1-channel Line Isolator
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Maintain Your Signal's Integrity

To keep your signal clear and clean over long runs, the Rapco Horizon ISOBLOX inline isolator has you covered. The XLR input and output make it a snap to drop into your mic's signal path, even far from stage. Built rugged for road use, the ISOBLOX is a must-have problem solver for every sound engineer's toolbox. Remove hum and ground loops while retaining a 600 ohm load and source impedance - all with the Rapco Horizon ISOBLOX.

Rapco Horizon ISOBLOX Features at a Glance:
  • 1 to 1 signal isolation
  • Isolates signal and ground
  • Inline-design leads to fast problem solving and installation
  • Built to last, out of powdercoated aluminum
  • Retains 600 ohm impedance on load and source
The Rapco Horizon ISOBLOX inline isolator is a reliable, must-have problem solver.

Tech Specs

Type Signal Isolator
Channels 1
Inputs 1 x XLR
Outputs 1 x XLR
Height 1"
Width 3.5"
Depth 1.25"
Weight 0.4 lbs.
Manufacturer Part Number ISOBLOX

Customer Reviews

Based on 3 reviews
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Great addition to your audio tool box

A very basic part of any audio toolbox, I bought it mainly to isolate a ribbon mic from phantom power on a mixer with phantom switchable only across all inputs. It does the job effectively with no loss in quality.


Does what it's supposed to do. One of those things where's it's gonna work or it's not and that's about it. Used this to isolate an old mains system that had a nasty ground loop after the snake return but before the driverack. Took the unit apart real quick and it's simply Neutriks connectors connected to a small transformer inside a metal tube. If you think you can do better for $30, go ahead, but it works if applied right and is a quick fix. It's basically a cheap XLR to XLR DI, so test the connection you want to troubleshoot with a DI first, and if that works, this is likely the product for you. This will NOT fix noise/interference picked up in a guitar cable.
Music background: Audio Engineer

RapcoHorizon BLOX Inline XLR Isolator

I've yet to benefit from the unit as I can tell. I hoped it would help isolate some of the ground noise I was getting... an actual radio station bleeding in on the ground line, ever so faintly, but it's still there. Anyway, I keep it in-line, just in case at any other venue, it would be of more help.
Music background: Guitarist
See also: Direct Input Boxes, RapcoHorizon, RapcoHorizon Direct Boxes