Radial Engineering

Radial Engineering R800 7058 Headload Guitar Amp Load Box 8 Ohm

Drive your amp into full saturation and capture every harmonic at any volume — the Headload puts your amp's sweet spot on tap in any room.

$1,994.49*
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*Price sourced from Amazon.com. Last updated:Oct 25, 2026.Price and availability are subject to change — details.

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Overview

The Radial Engineering Headload is simultaneously a power attenuator, a load box, and a direct recording solution — three tools consolidated into a single fan-cooled chassis. Its core function is replacing a speaker cabinet with a reactive 8-ohm load, allowing a tube amplifier to be driven into power-stage saturation without generating stage or control-room volume. The 130W RMS / 180W peak power handling means it can absorb the full output of a 100-watt head running hard. The integrated JDX Reactor — Radial's well-regarded amp direct box technology — samples the speaker output signal and shapes it with a 6-position cabinet voicing switch and 2-band shelving EQ, producing a direct feed that conveys harmonic density and speaker character rather than just a flat amplifier signal.

Where the Headload becomes particularly valuable in a professional recording workflow is the Phazer. When a real cabinet is also mic'd simultaneously and blended with the direct JDX feed, the two signals will almost always arrive at the console at slightly different phase relationships. The Phazer's continuous 0–360 degree sweep lets you resolve that by ear — the moment the two signals stop fighting each other, the combined tone opens up noticeably in the low-mids. For live production, the attenuation section alone justifies the unit: the rotary switch gives six discrete steps from full output down to approximately 20%, with a trim control for fine adjustment between positions. It is engineered for situations where the amp needs to breathe but the room — or the neighbors — cannot afford the volume.

Key Features

Combination speaker attenuator and simulator

Safely handles up to 130 watts RMS (180 peak

Radial JDX Reactor and Phazer for direct recording

Delivers great tone from your amp at low volume

Specifications

Type
Guitar Amp Load Box / Attenuator
Impedance
8 Ohm
Power Handling
130W RMS continuous / 180W peak
Attenuation
6-position rotary switch (100% to ~20%) + trim control
Direct Box
Radial JDX Reactor (integrated)
Phase Adjustment
Radial Phazer, 0–360 degrees continuous
EQ
2-band shelving EQ (JDX output)
Cabinet Emulation
6-position voicing switch
Cooling
Fan-cooled
Brand
Radial Engineering
Model
R800 7058

Frequently Asked Questions

The Headload is rated at 8 ohms. Your amplifier's output impedance must match — connecting a 4-ohm or 16-ohm head without proper matching can stress the output transformer. Verify your amp's speaker output impedance before patching into the Headload.
130 watts RMS continuous, with a 180-watt peak tolerance. This covers most combo and head amplifiers in live and studio use, including high-powered 100-watt heads, but the fan-cooled chassis is doing real thermal work at sustained full output — monitor operating temperatures in long sessions.
The Headload requires a standard IEC power connection — it is an active device. The JDX Reactor direct output is powered by the unit itself; no external DI box or phantom power from your console is needed for the direct signal.
The Phazer provides 0–360 degrees of continuous phase adjustment on the JDX direct output. When blending the JDX signal with a microphone on the cabinet, phase cancellation between the two sources can thin out your tone. The Phazer lets you time-align them by ear until the combined signal is full and coherent.
Yes. The 6-position rotary attenuator (scaling from full output down to approximately 20%) and fine-trim control operate independently. You can run the Headload purely as a passive-style power attenuator feeding a real cabinet while ignoring the JDX output entirely.