Radial Engineering Headload
Guitar Amplifier Load Box


Selected Model Price: $899.99
List Price: $1,000.00

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The Radial Engineering Headload is a combination load box and attenuator that is capable of handling up to 130 watts RMS of continuous power and peaks of 180 watts. Inserted between the head and cabinet, it allows the guitar amp to be driven hard while reducing the output level to reduce the sound pressure on stage or provide the means for quiet recording in the studio. This enables the artist to optimize the tone from the guitar amplifier without having to perform at ear-blistering levels.

The 100% discrete fan-cooled design begins with a series of cement encrusted, epoxy coated copper resistor coils that are controlled via a 6-position rotary switch to set the desired power reduction from 100% down to 20%. A trim control provides fine adjustment when below 20%. The Headload output can be turned off for quiet on-stage use, recording or when practicing using the built-in headphone amplifier.

In order to ensure greater consistency from gig to gig, the Headload is equipped with a Radial JDX Reactor direct box. This captures both the signal from the head plus the reactive load from the speaker cabinet for a more natural tone. For engineers that prefer to combine a direct feed with a microphone, the Headload has also been equipped with a Radial Phazer – phase adjustment tool. This lets you time-align the JDX direct feed with the microphone to deliver incredibly natural tones, or when pushed to extreme, create over the top effects. The JDX direct output may also be tailored to suit with a 6 position voicing switch to select from various cabinet emulation presets and fine tuned using a 2-band EQ to tame overly bright amps.

Radial Engineering Headload Features:

  • Gain reduction: Variable from 100% to 0%
  • Equalization: Low & high frequency shelving
  • Load:  Available in 4 Ohms, 8 Ohms, and 16 Ohms

Radial Engineering Headload Specifications:

  • Audio Circuit Type: Passive attenuation circuit with active equalization
  • Frequency Response: 90 Hz at -3 dB to 4 KHz at -6 dB
  • Low EQ: +/- 9dB @ 80 Hz
  • High EQ: +/- 9dB @ 6 Khz
  • Low & high resonance:  
    • 60 Hz and 6.5 KHz, shelving filter 6 dB/octave slope
    • +12 dB at 20% load setting
    • +9 dB at 40% load setting
    • +6 dB at 60% load setting
    • +3 dB at 80% load setting
    • None at 100% load setting
  • Headphone output power: 400 mW into 32 Ohms
  • Headphones impedance: 32 Ohms or higher recommended
  • Gain: -40 dB typical
  • Intermodulation distortion: < 0.05%
  • Noise: -104 dbu Unweighted
  • Input impedance: 8 Ohms
  • Output impedance: 250 Ohms
  • Power: Radial +/-15V 400 mA power supply
  • Construction: 14 gauge steel chassis and outer shell
  • Finish: Durable powder coat
  • Size: (L x W x D): 6.05 x 12 x 3.45" (154 x 305 x 87.6 mm)
  • Weight: 8 lbs (3.63 kg)
  • Shipping size: (L x W x D): 8 x 14 x 5" (203 x 365 x 127 mm)
  • Shipping weight: 10 lbs (4.5 kg)
  • Conditions: For use in dry locations only between 5°C and 40°C
  • Total harmonic distortion: < 0.05%
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