HeadRush Flex Prime

The HeadRush Flex Prime is a compact guitar and bass multi-effects processor and amp modeler with native Neural Amp Modeler (NAM) support and direct TONE3000 access through HeadRush Cloud¹. Made by HeadRush, it packs the company's modeling engine into a floor unit that, as Guitar.com's reviewer put it, "has squeezed itself into an enclosure that takes up no more room than four standard stompboxes"². It lists at $499, which Guitar.com's Tone3000 review called "the most affordable of the bunch" among HeadRush's WiFi-enabled modelers³.

What the Flex Prime does

The Flex Prime covers the full modeling chain: amps, cabinets, impulse responses and effects, with up to 14 DSP blocks (FX, amps, cabs, clones, IRs, etc.) per preset in one of 5 different signal path types¹. Guitar World's 2026 buying guide counts 97 amp models and 109 effects on the unit⁵.

Its standout feature is native NAM support. Neural Amp Modeler captures are third-party amp profiles, and the Flex Prime can play 2 NAM A2 Full captures at the same time, either via stereo doubling, switch doubling, or 2 separate NAM blocks. Switching the models to A2 lite raises that to 4 models in a single rig between 2 dedicated NAM blocks⁶. One limit worth knowing: Guitar.com's reviewer found "you can only load one NAM model per preset, whereas you can load multiple stock HeadRush amps"³.

The unit also supports HeadRush Cloud access and compatible NAM and TONE3000 content⁶. Getting to the Tone3000 hub requires a firmware update, installed with a lightweight update tool over USB-B³.

The controls: touchscreen, three footswitches and expression pedal

Guitar World's spec rundown matches the maker's: 3 footswitches with color LEDs, 1 expression pedal, a 300° main volume knob and a 360° navigation/data encoder⁴. The touchscreen is the main editing surface, and Guitar.com's reviewer found the smaller panel workable but tight: "the screen's a little cramped (a perhaps inevitable payoff for its frankly adorable little footprint), but the thing is easy to use, well-built and the basic models and effects sound excellent"³.

Power and connections

• Input: 1/4" (6.35 mm) TS input for guitar¹
• Outputs: 1/4" (6.35 mm) stereo pair outputs¹
• FX loop: Stereo FX loop with four-cable method support¹
• MIDI: 1/8" (3.5 mm) MIDI input (Type-A connector)¹
• USB: 1 x Type B⁴
• Power: DC 12 V, 3 A, center positive¹

The stereo FX loop with four-cable method support lets you place the Flex Prime's effects around your real amp's preamp section, a common setup for players integrating a modeler with an existing rig¹.

History and versions

The Flex Prime is a variant of the HeadRush Prime, the flagship floorboard in HeadRush's range. Where the Prime carries a seven-inch touchscreen, the Flex Prime's screen is four inches, and the unit squeezes into an enclosure that takes up no more room than four standard stompboxes²⁴.

Its physical design, though, comes from an older template. Purvis noted the Flex Prime takes "the design template of the old HeadRush MX5 (in fact it looks very nearly identical)"². The HeadRush MX5 launched in August 2021 as a compact floor processor with a built-in expression pedal with adjustable tension and a built-in toe switch⁷⁸,⁸, and carried more than 74 premium FX⁷.

The Flex Prime sits in HeadRush's current range alongside the Prime and the HeadRush Core. The Prime adds Bluetooth audio streaming⁹ and vocal processing that the Flex Prime does not, while the Flex Prime keeps the price at $499 against the Prime's $1,299 launch price. Firmware updates are shared across the line: Guitar World noted that the Flex Prime's firmware update "is also available for the full-fledged Flex model" and the smaller Core version⁴.

What reviewers said

Guitar.com's review found the Flex Prime easy to use and well-built, with the basic models and effects sounding excellent, though it noted the screen is a little cramped, "a perhaps inevitable payoff for its frankly adorable little footprint"³. The same review called it "the most affordable of the bunch at $499/£419"³, matching the $499 launch price⁴.

Videos

Click to load

Click to load

Click to load

Questions