Radial Engineering
Pro48 Active Direct Box
Best active direct box for musicians needing clean, high-headroom signal transfer.
The Radial Pro48 is a high-resolution active direct box engineered for exceptional audio performance and robust durability. It features a proprietary analog circuit and a digital switching power supply, providing increased headroom and a smooth, linear frequency response. This design ensures natural, uncolored signal transfer, making it ideal for modern instruments like active basses and acoustic guitars that often produce hot signals. Housed in a sturdy 14-gauge steel chassis with a protective bookend design, the Pro48 includes essential -15dB pad and ground lift switches to effectively manage common audio challenges.
$134.99
Owner Satisfaction
4.7
/ 5
Category Rank
23
/ 67
#23 in Direct Boxes
Price vs Category Average
-49%
Below average
Audio Circuit Type
Proprietary analog circuit with low-noise op-amp
/ Proprietary analog circuit with low-noise op-amp
Who it's for
- Road warriors needing gear that survives heavy daily transport
- Musicians using high-output instruments prone to signal clipping
- Touring professionals working with inconsistent venue power supplies
Who should skip it
- Users relying on interfaces or mixers lacking phantom power
- Engineers requiring advanced signal routing or specialized filtering tools
- Budget-conscious hobbyists who do not need high-headroom performance
Performance breakdown
Signal Transparency
Proprietary circuitry delivers a clean, uncolored signal for professional recording.
Headroom Capacity
Handles high-output active instruments without clipping or unwanted distortion.
Build Durability
Fourteen-gauge steel chassis survives the toughest touring and stage environments.
Noise Suppression
Effective ground lift switch eliminates common hums and electrical interference.
Power Efficiency
Digital switching supply maximizes phantom power for consistent, reliable performance.
Input Versatility
Essential pad switch manages hot signals from modern high-output pickups.
Key Specs
Audio Circuit Type
Proprietary analog circuit with low-noise op-amp
Frequency Response
20Hz - 20kHz (± 1.5 dB)
Dynamic Range
99dB
Noise Floor
-82dB below 0dBu
Maximum Input Level
+9dBu
Input Impedance
220kΩ (¼" input)
Output Impedance
600Ω (XLR output)
Construction
14 gauge steel chassis and outer shell
Features
- High-resolution active direct box for pristine sound
- Increased dynamic range and headroom
- 48V phantom-powered with efficient digital switching
- Rugged steel construction with protective design
- Ideal for active guitars and basses
- Handles hot signals with -15dB pad
- Eliminates hum with ground lift switch
- Built for demanding live sound applications
What customers say
Customers overwhelmingly praise the Radial Pro48 for its exceptional sound quality and rugged reliability. Users consistently report a clean transparent signal that preserves instrument character, noting its high headroom handles active sources without clipping. This sonic fidelity is matched by its legendary build quality. The durable steel enclosure ensures it withstands demanding live and studio use, fostering high confidence in its performance. While an investment, many professionals consider the Pro48 an essential, long-term tool that delivers outstanding value through its combination of pristine audio and bulletproof construction.
Know before you buy
No, the Pro48 is powered entirely by 48V phantom power from your mixing console or audio interface. It does not require batteries or an external power adapter.
While it works with both, the Pro48 is specifically engineered to handle the high-output signals produced by active basses and acoustic guitars. Its increased headroom ensures these hot signals remain clean and distortion-free.
The -15dB pad reduces the input signal level before it hits the internal circuitry. You should engage this switch if your instrument has an extremely high output that is causing clipping or distortion in your signal chain.
Yes, the Pro48 features a ground lift switch that disconnects the ground path between the input and output. This is a standard and effective way to eliminate ground loops that cause audible hum or buzz in your audio.
The unit is built with a 14-gauge steel chassis and a protective bookend design. This construction is specifically intended to withstand the rigors of professional live sound environments and frequent transport.
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