Radial Engineering
Radial EXTC-SA Guitar Effects Interface
Best creative signal routing for studio engineers and guitarists.
The Radial EXTC-SA Guitar Effects Interface is a stand-alone audio interface designed to seamlessly integrate guitar effects pedals into professional audio recording workflows. It allows users to apply effects like grit, wah, or flange to vocal tracks, drum sounds, or other instruments, offering a creative tool for unique sound design. The interface converts line-level signals to high impedance suitable for guitar pedals, with separate send and receive controls for optimizing the signal path. It features Radial's discrete class-A buffering for audio integrity, transformer isolation to eliminate ground loops, and a 180º polarity reverse switch. Two loops enable comparison or combination of signal paths, making it an innovative device for manipulating effects and expanding sonic possibilities.
$339.99
Owner Satisfaction
4.5
/ 5
Category Rank
179
/ 439
#179 in Audio Cards & Adapters
Price vs Category Average
-70%
Below average
Power Supply
Included
/ Included
Who it's for
- Guitarists and producers seeking to blend studio-grade effects with their instrument.
- Recording engineers and guitarists wanting to refine recorded tones after tracking.
- Discerning musicians and engineers prioritizing sonic purity in their signal path.
Who should skip it
- Casual guitarists or those without a dedicated recording setup.
- Budget-conscious musicians or those seeking an all-in-one solution.
- Beginners unfamiliar with studio signal flow and advanced audio concepts.
Performance breakdown
Signal Integrity
Discrete class-A buffering preserves every nuance of your original audio signal.
Noise Suppression
Transformer isolation effectively eliminates ground loops and unwanted hum in the chain.
Workflow Integration
Seamlessly bridges the gap between line-level gear and high-impedance guitar pedals.
Build Quality
Rugged steel construction built to withstand the rigors of professional studio environments.
Phase Control
Polarity reverse switch ensures perfect phase alignment when blending complex signal paths.
Creative Versatility
Dual loops offer endless possibilities for layering and comparing unique pedal combinations.
Key Specs
Power Supply
Included
Audio Channels
2.0 Stereo
Features
- Integrate guitar effects into pro audio
- Convert line level to high impedance for pedals
- Transformer isolation eliminates ground loops
- Discrete class-A buffering for audio integrity
- 180º polarity reverse for phase alignment
- Dual loops for signal path comparison or blending
What customers say
Customers consistently praise the EXTC SA for its exceptional build quality and its seamless integration into various studio and live setups. Its ability to effortlessly reamp guitar signals through effects pedals is a standout feature, often described as transparent and noise free. Users appreciate the robust construction and the straightforward controls, making it a reliable tool for creative sound shaping. This professional grade solution delivers consistent, high fidelity results, enhancing the versatility of existing gear.
Know before you buy
Yes, that is its primary purpose. The interface converts line-level signals from your DAW or mixer into the high-impedance signal required by guitar pedals, allowing you to run vocals, drums, or synths through your pedalboard.
The EXTC-SA includes transformer isolation specifically designed to eliminate ground loops, which are the most common cause of hum when connecting external gear. Its discrete class-A buffering also ensures your signal remains clean and transparent.
Some guitar pedals can flip the phase of your audio signal. The polarity reverse switch allows you to correct phase alignment issues, ensuring your processed signal stays in phase with your original dry track.
The unit is designed for mono pedal chains. While it features two loops for signal path comparison or blending, it is intended to interface with mono guitar effects pedals.
No, the EXTC-SA handles the impedance conversion internally. It acts as both a re-amp box and a direct box, managing the signal level changes required to move between professional line-level gear and high-impedance guitar pedals.
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