Twinline - Guitar effects pedal Radial Engineering - Free user manual and instructions
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| Product Type | 2-Channel Active Direct Box |
| Manufacturer | Radial Engineering |
| Model | Twinline |
| Inputs | 2 x 1/4" TS (unbalanced) |
| Outputs | 1 x XLR (balanced, transformer isolated) |
| Power Supply | 48V phantom power or 9V battery |
| Frequency Response | 20 Hz – 20 kHz (±0.5 dB) |
| Dynamic Range | > 110 dB |
| Maximum Input Level | +21 dBu |
| Gain Adjustment | Fixed (unity gain) |
| Ground Lift Switch | Yes |
| PAD Switch | -15 dB |
| Construction | Steel chassis, baked enamel finish |
| Dimensions (W x H x D) | 5.25" x 1.75" x 4.25" (133 x 44 x 108 mm) |
| Weight | 1.5 lbs (0.68 kg) |
| Warranty | 3 years (limited) |
| Included Accessories | 9V battery (installed), documentation |
| Recommended Application | Merging two stereo or mono signals to one output for recording or live sound |
| Maintenance | Wipe with dry cloth; avoid solvents |
| Safety Compliance | CE, RoHS |
Frequently Asked Questions - Twinline Radial Engineering
What is the Radial Twinline used for?
The Radial Twinline is a 2-channel active direct box designed to merge two unbalanced signals into one balanced XLR output. It is ideal for summing stereo sources or combining two instruments into a single channel on a mixing console.
Does the Twinline require external power?
The Twinline can be powered via 48V phantom power from the XLR output or by an internal 9V battery. When using phantom power, no battery is needed, but the battery provides convenience when phantom power is unavailable.
How do I engage the ground lift?
The ground lift switch is located on the side panel. Slide it to the 'Lift' position to disconnect the ground between input and output, which helps eliminate hum caused by ground loops.
What is the PAD switch for?
The PAD switch applies a -15 dB attenuation to the input signal. Use it when connecting high-output sources (e.g., line-level keyboards or active basses) to prevent input overload and distortion.
Can I use the Twinline with passive instruments like a guitar?
Yes, the Twinline is an active DI with a high input impedance (1 MΩ), making it suitable for passive pickups. The input impedance preserves the instrument's tone without loading the pickups.
What type of battery does the Twinline use?
It uses a standard 9V alkaline or rechargeable battery. The battery compartment is located on the bottom panel; remove the screw to access. When phantom power is present, the battery is bypassed to extend its life.
How do I set up the Twinline for stereo summing?
Connect your left source to Input 1 and right source to Input 2. Both signals are internally summed to mono and sent to the single XLR output. Use the PAD and ground lift as needed for each input.
Is the output transformer isolated?
Yes, the Twinline features a custom-wound Radial transformer that provides galvanic isolation, eliminating hum and buzz from ground loops while preserving audio quality.
What is the maximum cable length for the XLR output?
The balanced output can drive cables up to 100 meters (300 feet) without signal degradation. For best performance, use high-quality balanced XLR cables.
Where can I find the user manual?
The user manual is available for free download on notice-facile.com. You can also request a translated version via the website's language selection tool.
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USER MANUAL Twinline Radial Engineering
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Product information
Brand : Radial Engineering
Model : Twinline
Category : Guitar effects pedal