The Metal Core Deluxe MKII is a powerful high-gain preamp pedal built for modern metal and hard rock players who want massive amp tone in a compact, pedalboard-friendly format. Featuring three iconic high-gain amp models, integrated cabinet impulse responses, and full IR loading capability, it delivers crushing tone whether you’re running into an amp or going fully ampless.

From tight rhythm chugs to soaring lead tones, the Metal Core Deluxe MKII gives you studio-quality high-gain sound with total flexibility.

Key Highlights

• Three high-gain amp models in one pedal
• Built-in cabinet impulse responses for ampless rigs
• 512-sample high-resolution IR support
• Load third-party IRs for custom tone shaping
• USB-C connection for editing and firmware updates
• Five user IR slots for personalized setups
• Mobile app editing for live performance control
• Rugged, stage-ready construction

Three Legendary High-Gain Amp Models

Select between three powerful modern amp voices using the onboard 3-way toggle switch:

• Duo Rect – thick, aggressive modern metal tones
• Fireman – tight, punchy high-gain clarity
• VH 4 – articulate, saturated lead and rhythm power

Each amp model includes a perfectly matched cabinet IR for realistic, mix-ready tone straight out of the pedal.

Built-In & Custom Impulse Responses

Impulse Responses complete the sound when running direct or into a PA or interface.

The Metal Core Deluxe MKII includes:

• Matching IRs for each amp model
• 512-sample high-resolution processing for realism
• 5 user IR slots (positions 4–8)

You can load your own favorite third-party IRs using the MetalCore editing software. Simply import WAV files — the software automatically converts them to the proper format.

USB-C Editing & Firmware Updates

The USB-C port allows you to:

• Load and manage custom IRs
• Tweak internal parameters
• Perform firmware updates

To update firmware, connect to your PC and hold the footswitch during startup to enter DFU mode, then run the updater software.

Mobile Editing for Live Use

No computer nearby No problem.

You can edit tones on the go using the EFX Mobile App:

• Works with iOS (Lightning to USB adapter required)
• Works with Android using OTG adapter
• Perfect for live gigs and quick tone tweaks

Why Players Love It

• Massive modern metal tone in a compact pedal
• Real cabinet feel with high-resolution IRs
• Works perfectly for ampless rigs
• Customizable to any playing style
• Studio-quality sound for stage or recording

Summary

The NUX Metal Core Deluxe MKII is a complete high-gain amp solution in pedal form. With three crushing amp models, integrated cabinet IRs, full third-party IR support, and deep editing via USB or mobile app, it’s built for modern guitarists who demand power, precision, and flexibility.

Whether you’re recording direct, running into a PA, or building an ampless rig, the Metal Core Deluxe MKII delivers massive tone with total control.