Radial SGI Studio Guitar Interface 1-channel Passive Re-Amping Device

Long Cable Run System for Guitar with Transmitter and Receiver Modules, Class A Active Circuitry, Drag Control Pickup Load Correction, and Heavy-duty Construction
Radial SGI Studio Guitar Interface 1-channel Passive Re-Amping Device image 1
Radial SGI Studio Guitar Interface 1-channel Passive Re-Amping Device image 1
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Radial SGI Studio Guitar Interface 1-channel Passive Re-Amping Device
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Up to 300' Cable Runs for Your Guitar WIthout Signal Loss!

The Radial SGI Studio Guitar Interface System allows amazingly long cable runs for guitars (328') over a standard balanced XLR microphone cable. Using ruggedly constructed transmitter and receiver modules loaded with high-quality Class A active circuits, the SGI interface system lets you play on the largest stages or record from the studio control room. Drag control load correction and isolation transformers ensure great sound at long distances, without hum or buzz. If your studio or stage setup requires long cable runs, you need the easy-to-use, road-ready SGI system!

Radial SGI Studio Guitar Interface System at a Glance:
  • Quality components
  • The SGI-TX Transmitter Module
  • The SGI-RX Receiver Module
Quality components

The Radial SGI is made up of two modules: The SGI TX transmitter and the SGI RX receiver. These are connected using standard balanced twisted pair cable, thus enabling the SGI to be used in any studio or stage environment. Both are made from 14-gauge steel using Radial's unique I-Beam construction and protective book-end design. This ensures the Radial SGI will continue working for years even when tossed around in adverse conditions. A full-bottom rubberized pad has plenty of 'stay' while providing both mechanical and electrical isolation while providing a protective barrier.

The SGI-TX Transmitter Module

When using the SGI, the guitar connects to the SGI TX transmitter. This is a 100% discreet Class A active driver that employs the same front end and circuit topology found inside the popular Radial JD7 Injector. Class-A circuits retain the natural characteristics of the instrument by eliminating zero-cross distortion which in turn reduces harmonic distortion, inter-modulation distortion and phase shift. To counter any effect of the circuitry, the SGI is equipped with Drag Control, an innovative load correction circuit that reintroduces the natural relationship between the guitar and amplifier that would otherwise be lost. Power is supplied by a 15VDC external supply for added headroom over 9V systems. Both transmitter and receiver modules are equipped with isolation transformers to eliminate buzz and hum caused by ground loops.

The Radial SGI-RX Receiver Module

When in use, the amplifier is connected at the receive end using the SGI RX. This module is completely passive, thereby not requiring local power. The transformer receives the signal and is wired 'in reverse' to counteract any ringing that may be induced at the input side. It also eliminates ground loops, a common problem when connecting equipment using different electrical circuits.

Radial SGI Studio Guitar Interface System Features:
  • Drive a guitar signal 300 feet without loss
  • 100% discreet Class A electronics
  • Drag Control pickup load correction
  • Transformer isolated to eliminate noise
  • Routes using standard balanced XLR cable
  • SGI-TX hi-Z input: 1/4" jack (buffered) with Drag control load correction circuit
  • SGI-TX output: Balanced XLR-M output
  • SGI-RX input: Balanced XLR-F input
  • SGI-RX hi-Z output: 1/4" jack
  • Transformers: Radial special design 1:1 transformers on TX and RX modules
  • Ground lift: LIFT switch on SGI-RX
  • Power supply: Included - 15VDC 400ma , center +
  • Construction: 14 gauge steel chassis and outer shell, baked enamel finish
  • Weight: TX - 1.1 lb (0.5 kg); RX - 1.1 lb (0.5 kg)
The Radial SGI Studio Guitar Interface System lets you maintain great tone with even the longest cable runs!

Additional Media

Tim Timmons shares his Journey of Faith and Music
Long Guitar Cables
New in Stock at Sweetwater

Tech Specs

Type Active DI/Guitar Interface System
Channels 1
Inputs SGI-TX: 1 x Instrument, SGT-RX: 1 x XLR
Outputs SGI-TX: 1 x XLR, SGT-RX: 1 x Instrument
Height 1.8"
Width 4.2"
Depth 2.8"
Weight 2 lbs. each
Manufacturer Part Number R800 1600 00

Customer Reviews

Based on 6 reviews
Write your review

Great product

I am a worship leader and an important part of controlling stage noise is to keep guitar amps shielded (in a stage left side room). The Radial SGI helped us run 50' cable from pedal boards to amps while keeping strong, clean signal. This is exactly what we needed and I highly recommend!
Music background: Guitar player 27 years / Worship leader 14 years

Does exactly what it advertises

My studio purchased the Radial SGI for recording guitars in the control room with combo amps in the live room. I tested against a 15ft cable with pedalboard and amp both in the live room. I thought this would be a worst case scenario given passive pickups of a strat and Les Paul (covering single coil test and humbucker test) would be much more particular about load impedance than a buffered pedal board. The SGI was actually a bit quieter in terms of hum and line noise than the cable with the ground lift which surprised me. There was little discernible difference in signal level hitting the amp when directly plugged in or to the pedal board when it was connected. The drag control on the SGI was a very nice feature. Somewhere just above 50% seemed to be comparable to the direct cable for both guitars in terms of high end rolloff. When drag was set to max, the SGI was noticeably brighter. This is a great option for impedance matching to get the fine details that I was most afraid of losing. The range of the drag control seems like it would cover most guitar and amplifier combinations. Typically I’ll keep a pedal board in the control room for adjustments on the fly, and with any buffered pedals I would imagine the drag control will have little to no impact. Still it is good to know that even in the most demanding situations, I have a rock solid tool. I did notice that the SGI is sensitive to XLR adapters. I first attempted to wire through the XLR wall panel in my rooms and noticed the XLRM and XLRF ends were wired backward from the SGI, so I used an XLRM-XLRM and XLRF-XLRF adapter on each to make the connection. I get no signal flow when wired this way. I assume the phase is inverted between the cable and adapter and that is causing cancellation. Instead I used an XLR-TRS connection on my wall plate with corresponding cables. This works fine. It’s just something to note in case other customers experience this. I am extremely happy with this engineered and packaged solution vs. the direct box / reamp DI combo that it is replacing. Per usual, Sweetwater support was excellent in guiding to the best product based on needs and shipping time is always lightning fast.

exactly what I needed

I was having some static issues with the instrument cable between my last pedal and my amp's input (also more handling noise than I expected) these two boxes basically made it to where the addition to the noise floor after my last pedal was completely eliminated. I kind of wish all guitar signals were transported as balanced signals now :) If you've read about this device then all I'm doing is confirming that it does as advertised. I fiddled with the drag control (it was placed after a buffered pedal btw) and I'm pretty certain I like "maximum drag" which I guess is highest impedence? Makes sense I guess, it presents the clearest most crystaline highs/general signal compared to any lower setting (no volume change btw: drag or the device in general just lower noise)
Music background: Musician


These bad boys are a must if you are running sound in an environment where you have to control the amp volumes. Place your amp in a back room, run an XLR, and let the playing begin! My only thought that they could work on in the future, is to make it to where you can attach the power plug to the receiver side, instead of the transmit side. It just means theres a "wall-wart" out with your pedal board. It would just make sense to have that hidden backstage. But, it's not a deal breaker!
Music background: Live Sound Engineer


This is a great device for running a long cable from your pedal board to your amp....perfect for shows with a big stage or studio use when your iso booth is far from your recording interface. Easy to use and works wonderfully. Thanks to Mark Magdich for recommending! :) A very good alternative to going wireless - check it out!
Music background: Gigging Musician
See also: Direct Input Boxes, Radial, Radial Direct Boxes