Radial Pro 48

The Radial Pro48 is a professional active DI box designed to connect guitars, bass guitars, keyboards, and other electronic instruments to a mixing console, audio interface, or PA system. Thanks to its high headroom, wide frequency range, and low distortion, the original character of your instrument is preserved. The Pro48 is suitable for both active and passive instruments and serves as a reliable link between your instrument and the sound system, whether on stage or in the recording studio.

Extra headroom thanks to an internal switching power supply
What sets the Radial Pro48 apart from many other active DI boxes is its internal switching powersupply. This circuit uses standard 48V phantom power and generates a higher internal supply voltage for the audio circuit. As a result, the Pro48 offers more headroom and a wider dynamic range, allowing even powerful signal peaks to be processed without unwanted distortion. This is especially important for active bass guitars and electro-acoustic guitars with built-in preamps, which often produce a higher output level.

Transparent signal transmission with preserved dynamics
The analog audio circuit with a low-noise op-amp ensures natural and transparent signal transmission. With a dynamic range of 99 dB, low harmonic distortion, and a frequency response extending well beyond 40 kHz, both the low frequencies and the details in the high frequencies are reproduced with precision. This makes the Pro48 suitable not only for instruments with powerful active electronics but also for passive bass guitars and acoustic instruments where preserving tone and dynamics is important.

Balanced XLR output and convenient THRU connection
To connect an instrument, the Pro48 features a 6.35 mm jack input with an input impedance of 220 kOhm. The instrument signal is converted to a balanced, microphone-level signal and routed via the XLR output to a mixing console or microphone preamp. This allows for longer cable runs with less risk of interference and signal loss. The separate THRU output allows you to send the original instrument signal simultaneously to a guitar or bass amplifier. For example, you can use your own amplifier on stage while the sound engineer receives a separate DI signal.

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-15 dB pad and ground lift for optimal signal control
The Radial Pro48 offers sufficient control even for instruments with a high output level. The built-in -15 dB pad switch attenuates the input signal to prevent clipping. This is useful for active bass guitars, keyboards, and other instruments with powerful output signals. In addition, the DI box features a ground lift switch that helps reduce ground loops and the associated hum.

Ready to use right away thanks to 48V phantom power
The Pro48 is powered by 48V phantom power from the connected mixing console, microphone preamp, or audio interface. This eliminates the need for an external power adapter or battery. An LED indicator shows when phantom power is present and the DI box is operational.

Rugged steel enclosure for heavy-duty use
As you’d expect from Radial, the enclosure is designed for heavy-duty use. The 14-gauge steel construction and distinctive bookend design protect the connectors and switches from damage. Internally, the circuit board is securely mounted to minimize mechanical stress on the electronic components. The powder-coated finish protects the housing, and the neoprene base provides extra grip and electrical insulation.

Suitable for bass guitar, acoustic guitar, and keyboards
Whether you want to connect an active bass guitar directly to the PA, record an electro-acoustic guitar, or send a keyboard signal to a mixing console: the Radial Pro48 combines a transparent sound with the practical connectivity and reliability needed during rehearsals, performances, and studio recordings.

Radial Pro48 features:

• professional active 1-channel DI box
• suitable for active and passive instruments
• ideal for, e.g., bass guitar, acoustic guitar, electric guitar, and keyboard
• converts unbalanced instrument signals to balanced, microphone-level signals
• analog audio circuit with low-noise op-amp
• Internal switching power supply for increased headroom
• Wide dynamic range with minimal distortion
• Transparent signal transmission that preserves the instrument’s tone and dynamics
• Powered by 48V phantom power
• LED indicator for phantom power
• Input: 1x 6.35 mm jack
• THRU output: 1x 6.35 mm jack for connection to an instrument amplifier
• Balanced output: 1x XLR male
• -15 dB pad switch for instruments with a high output level
• Ground lift switch to reduce hum caused by ground loops
• Frequency response: 20 Hz – 20 kHz (±1.5 dB)
• Frequency response extends beyond 40 kHz
• Dynamic range: 99 dB
• Total harmonic distortion (THD): 0.001% at 0 dBu
• Intermodulation distortion: 0.002% at 0 dBu
• Input impedance: 220 kOhm
• Output impedance: 175 ohms
• Maximum input level: +9 dBu
• Equivalent input noise level: -86 dBu
• noise floor: -82 dB relative to 0 dBu
• 14-gauge steel enclosure
• Protective bookend design with recessed connectors and switches
• Rugged internal construction with mechanically supported circuit board
• wear-resistant powder coating
• Neoprene bottom for grip and electrical insulation
• dimensions: 10.8 x 7.0 x 4.4 cm
• Weight: 540 grams
• Manufacturer’s part number: R800 1105 00