Pricing and availability

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Average Price: $214

Standard/Professional

$119

$300+

Price Tier

Budget

Standard

High-end

Price History

Based on price data from 2 merchants for "Suhr ISO Line Out Box". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Unleash the full potential of your amp with the Suhr ISO Line Out Box, an essential tool for musicians looking to experiment with expansive wet/dry rigs or send a pristine line-level signal to an effects processor. This compact unit transforms your amplifier’s output into a transformer-isolated signal, perfect for feeding into another amp’s effects loop return or a separate power amplifier. With the combination of a phase switch and ground reference switch, you're equipped to tackle any interference issues, ensuring your sound remains crystal clear.

Designed for both balanced and unbalanced connections, the Suhr ISO Line Out Box offers flexible routing options, making it an invaluable addition to any guitarist's setup. Whether you're on stage or in the studio, its robust build and intuitive controls provide a seamless integration process. Note that while this is not a load box, it significantly enhances your rig's versatility and sound quality by maintaining signal integrity across different setups.

Key Features:

  • Provides a transformer-isolated signal from your amplifier’s speaker output
  • Ideal for sending a line-level signal to effects processors or experimenting with wet/dry rigs
  • Includes phase switch and ground reference switch (only applicable with balanced cables)
  • Compatible with both balanced and unbalanced connections
  • Speaker Thru in/out for easy routing

Product specs

Type Line out box
Channels 1
Polarity Switch Yes
Ground Lift Yes
Inputs 1 x 1/4" (in)
Outputs 1 x 1/4" (thru), 1 x 1/4" (line out)

FAQs

What is the primary function of the Suhr ISO Line Out Box?

The Suhr ISO Line Out Box provides a transformer-isolated signal from a guitar amplifier's speaker output, allowing you to send a line level signal to an effects processor or recording device without affecting the original amp tone.

Does the Suhr ISO Line Out Box include a ground lift feature?

Yes, the Suhr ISO Line Out Box includes a ground lift switch to help eliminate hum and ground loop noise when connecting to other audio equipment.

Can the Suhr ISO Line Out Box be used with any guitar amplifier?

The Suhr ISO Line Out Box is designed to be compatible with most guitar amplifiers that have a speaker output, providing a safe and isolated line level signal for further processing.

How does the polarity switch on the Suhr ISO Line Out Box function?

The polarity switch on the Suhr ISO Line Out Box allows you to reverse the phase of the output signal, which can be useful for ensuring phase alignment when integrating with other audio equipment.

What are the input and output connections available on the Suhr ISO Line Out Box?

The Suhr ISO Line Out Box features a 1/4" input, a 1/4" thru output for direct amp connection, and a 1/4" line out for sending the isolated signal to other devices.

Jean-Michel Kajdan

Jean-Michel Kajdan

Suhr ISO line out box

Video thumbnail for Suhr ISO line out box by Jean-Michel Kajdan

Suhr ISO line out box

Jean-Michel Kajdan

Jean-Michel Kajdan

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Suhr ISO Line Out Box.

Features and functionality

  • Some users find the Suhr ISO Line Out Box connections confusing, particularly when integrating with amps like the Boss Katana 100 MKii.

    Source
  • The Suhr ISO Line Out Box is designed to provide a line-level signal for effects return or power amp inputs, not for regular guitar inputs.

    Source

Use cases and applications

  • A user considers using two Boss Katana mkii amps for left and right channels with another amp as the dry center, leveraging the stereo expand feature.

    Source
  • The Suhr ISO Line Out Box may not provide a strong enough signal for direct headphone use; additional amplification may be necessary.

    Source
  • Using the Suhr ISO Line Out Box with a Marshall Origin20H allows for stereo configuration without needing multiple cabinets, adding tonal variety when paired with a Fender Reverb.

    Source

Setup and maintenance

  • Users debate whether speaker cables with 6.3mm/1/4” tips are needed for connections instead of standard guitar cables, highlighting a common point of confusion.

    Source
  • Connecting a DI output with always-on speaker emulation directly to a guitar amp can result in undesirable tonal coloring, better suited for PA or full-range speakers.

    Source

Comparisons

  • The Captor X is often recommended over the Suhr ISO Line Out Box for its additional features like cab simulation and headphone use, offering a more complete silent playing solution.

    Source
  • The Fender Deluxe Reverb's digital processing can introduce latency, affecting phase alignment when used with analog amps like the Marshall, unlike using a PA speaker.

    Source

User experience

  • Users report that studio monitor headphones are essential for true sound representation when using equipment like the Captor X, as regular headphones may alter the sound with EQ adjustments.

    Source

Based on 0 Reviews and 0 Ratings

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Artist usage

Add artist
See how Scott Henderson uses Suhr ISO Line Out Box

Scott Henderson

Guitarist

Tribal Tech

...
Verified via YouTube

Scott Henderson points out his Suhr ISO Line Out Box at 2:15 in this video.

See how John Norum uses Suhr ISO Line Out Box

John Norum

Guitarist

Europe

...
Verified via JOHN NORUM OFFICIAL WEBSITE

At the back of the amp rack. The box is used after the amps at speaker level to create a line level signal for the WET part of the rig. There is also a custom AC power box and a speaker thru box with Speakon connectio

See how Lincoln Brewster uses Suhr ISO Line Out Box

Lincoln Brewster

Singer, Guitarist

...
Verified via Photo

In this Instagram post at 2:13mins, Lincoln unboxes his ISO Line Out.

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Suhr ISO Line Out Box, it is most commonly used with the following gear.

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Suhr Custom Classic Solid Body Electric Guitars
1
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Pete Cornish LD-1 Boost Effects Pedals
1
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Foxrox Octron Harmonizer & Octave Effects Pedals
1
Roland SDE-3000
Roland SDE-3000 Effects Processors
1
MXR M101 Phase 90
MXR M101 Phase 90 Phaser Effects Pedals
1
Xotic Effects EP Booster
Xotic Effects EP Booster Boost Effects Pedals
1

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