Pricing and availability
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Average Price: $214
Standard/Professional
$119
$300+
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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
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What is the primary function of the Suhr ISO Line Out Box?
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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.
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Does the Suhr ISO Line Out Box include a ground lift feature?
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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.
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Can the Suhr ISO Line Out Box be used with any guitar amplifier?
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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.
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How does the polarity switch on the Suhr ISO Line Out Box function?
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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.
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What are the input and output connections available on the Suhr ISO Line Out Box?
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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.
Videos
Jean-Michel Kajdan
Suhr ISO line out box
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
Use cases and applications
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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.
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The Suhr ISO Line Out Box may not provide a strong enough signal for direct headphone use; additional amplification may be necessary.
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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
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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.
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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.
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Comparisons
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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.
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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.
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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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