York Audio Kw 412 M25sh Irs Review

Subject: Digital Capture and Sonic Analysis of the Marshall "Kerry Wright" 4x12 Cabinet with Celestion G12M-25 Speakers Date: October 26, 2023 Focus: Tone shaping, frequency response analysis, and application in modern digital modeling.

The York Audio KW 412 M25-SH Cab Pack is a high-fidelity impulse response (IR) library based on a custom Kerry Wright 4x12 cabinet originally built for fusion guitar legend Scott Henderson. This pack is widely considered a benchmark for Greenback-style IRs due to its remarkable clarity, "amp in the room" realism, and the unique resonance of the boutique cabinet it captures. Key Specifications & Features Cabinet: Custom Kerry Wright 4x12 straight cabinet. Speakers: UK-made Celestion G12M 25W Greenbacks.

Unique Folders: Includes a dedicated "Scott Henderson" folder featuring the artist's personal microphone placements, as well as signature mixes for Jim Adkins (Jimmy Eat World).

Ambient Options: Features new Stereo Room captures and Stereo Mixes designed to provide a natural stereo image, particularly effective for headphone use.

Format Compatibility: Available in 24-bit .WAV files at 44.1k, 48k, and 96k sample rates, making them compatible with almost all hardware modelers (Fractal, Line 6, Kemper, Strymon) and DAWs. Tonal Characteristics

The KW 412 M25-SH is known for a sound that is both "fat and clear".

Low End: Warm, thick, and highly resonant without becoming muddy.

Midrange: Signature vocal Greenback midrange that is present and balanced, avoiding the "boxy" feel of some vintage cabs.

Top End: Incredibly detailed and articulate, offering high note definition and string clarity. Included Microphones

York Audio used an extensive selection of classic and boutique microphones to capture this cabinet:

Dynamic: Shure SM57 (modern and vintage), SM58, SM7, Sennheiser MD421 (modern and vintage), e906, and Beyerdynamic M69. Ribbon: Royer R-121, Beyerdynamic M160, and Shure KSM313.

Condenser: Telefunken U47, ADK U67, Neumann KM 184, AKG C414, and Dachman Audio U87i.

The pack is highly recommended for everything from pristine cleans and edge-of-breakup (EOB) tones to high-gain lead work. KW 412 M25-SH - York Audio

Subject: York Audio KW 412 M25SH
Type: 4x12 Guitar Cab Impulse Response Pack
Core Components: 1970s Marshall basketweave cab, Celestion G12M-25 (pre-rola) speakers, Shure SM57, Royer R-121.

If you want, I can create a one-page quickstart sheet, a rack wiring diagram, or a measurement-based alignment procedure — tell me which.

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York Audio KW 412 M25-SH is an impulse response (IR) cab pack modeled after fusion legend Scott Henderson’s personal Kerry Wright 4x12 cabinet

. It is widely considered a top-tier choice for capturing classic and modern "Greenback" tones with exceptional clarity and detail. York Audio Key Specifications & Features Cabinet Source: A custom Kerry Wright 4x12 cabinet loaded with UK-made Celestion G12M 25W Greenback Tone Profile:

Features a warm, thick low end, the signature vocal midrange of Greenbacks, and an articulate top end that avoids harsh "sizzle". Unique Folders: Includes a dedicated "Scott Henderson" folder containing his specific personal microphone placements. Artist Mixes: Includes three custom mixes created for Jim Adkins of Jimmy Eat World. Stereo Room Captures:

Features new stereo room captures and mixes (using an AEA R88) designed to provide a natural "amp-in-the-room" feel, especially through headphones. York Audio Microphone Selection

The pack includes captures from a wide variety of microphones, including: York Audio york audio kw 412 m25sh irs

Shure SM57 (Modern and Vintage Unidyne III), SM58, SM7, Sennheiser MD421 (Modern and Vintage), and e906.

Royer R-121, Beyerdynamic M160, Shure KSM313, and vintage STC 4119. Condenser:

Telefunken U47, ADK U67, Dachman Audio U87i, Neumann KM 184, and AKG C414. Technical Details 24-bit .WAV files at 44.1k, 48k, and 96k sample rates. Resolution:

500ms IRs for maximum resolution, compatible with standard hardware truncation. Compatibility: Seamlessly integrates with Fractal Audio Line 6 Helix , and various DAW plugins. York Audio This pack is available directly from the York Audio product page specific microphone mixes are recommended for high-gain versus clean tones? KW 412 M25-SH - York Audio

The KW 412 M25-SH Cab Pack is based on a Kerry Wright 4x12 cabinet loaded with UK made Celestion G12M 25w Greenback speakers. York Audio

Title: The Ghost in the Wire

Logline: A disgraced audio forensic analyst discovers that a vintage speaker model, the York Audio KW 412 M25SH IRS, isn't just a relic of analog sound—it’s a dormant military-grade psychoacoustic weapon, and someone just turned it on.

The Story

Rain lacquered the cobblestones of York, England’s oldest district. Inside a cluttered workshop that smelled of solder and mildew, Elias Thorne stared at the charred remains of a speaker cabinet. The blackened badge read: York Audio KW 412 M25SH IRS.

“This isn’t a speaker,” he muttered, his voice raspy from years of disuse. “It’s a confession.”

Three days ago, a former MI5 analyst named Mira Sudol had walked into Elias’s shop. She wasn’t looking for a vintage 4x12 guitar cabinet. She was looking for a ghost. For two years, she’d been haunted by a low-frequency hum—a subsonic drone that triggered panic attacks, fragmented memories, and aphasia. Doctors called it tinnitus. She called it the Shiver.

“The hum only appears near old sound systems,” she’d said, sliding a worn service manual across the counter. The cover read: York Audio KW 412 — Modified for IRS (Infra-Red Sonic) Calibration.

Elias had laughed. IRS wasn’t “infra-red.” In old York Audio engineering slang, it stood for Inverse Resonance System—a classified side project from the late ‘80s, when British defense contractors secretly repurposed guitar amps for acoustic harassment.

The Build

He’d spent forty-eight hours tracing the circuit. The KW 412 M25SH was a monster: four 12” Celestion M25 speakers, known for their “brown sound.” But inside this unit, the wiring was wrong. Instead of a simple series-parallel, the coils were wound with a bismuth-iron alloy—non-magnetic, reactive to neural fields. The “SH” in the model number didn’t stand for “Super Heavy.” It stood for Schumann Harmonic—a frequency that matches Earth’s own resonance, 7.83 Hz.

When played at specific amplitudes, the IRS circuit didn’t produce sound. It produced standing waves that bypassed the eardrum and resonated directly with the brain’s limbic system. You didn’t hear the York Audio KW 412. You felt it. Fear. Euphoria. Rage. Programmable emotion, delivered via quarter-inch jack.

The Crime

Elias powered up the damaged unit using a lab bench generator. The cones didn’t move. But a pressure change filled the room—a cold, sinking dread. His vision blurred. For three seconds, he saw his dead daughter’s face, then a flash of a London underground station, then nothing.

When he came to, the oscilloscope showed a spike: 7.834 Hz, modulated with a voiceprint.

“Mira wasn’t a victim,” he whispered. “She was the target.” Subject: Digital Capture and Sonic Analysis of the

He pulled the service manual again. Page 47, handwritten notes: “Project Silencio. York Audio KW 412 M25SH IRS units deployed 1989-1991. Each amp paired to a single operator’s EEG signature. The amp doesn’t play music. It plays the operator’s suppressed trauma, amplified 400x, into the skull of a subject.”

Mira hadn’t been haunted. She’d been used. Someone had her old EEG profile. Someone had another York Audio KW 412 M25SH IRS—still intact, still hidden—and was broadcasting her nightmares into her brain to control her.

The Hunt

Elias traced the speaker’s serial number to a decommissioned BBC relay station outside York. He arrived at midnight, carrying only a modified Walkman and a pair of ferrofluid-damped headphones.

The station was silent except for a low, throbbing pulse—the Shiver. In the basement, a pristine York Audio KW 412 M25SH IRS sat on a shipping pallet, wired to a 1970s Revox tape machine. The tape was old, spooling endlessly. On it was a loop: Mira Sudol’s own childhood scream, recorded during a suppressed memory extraction in 1989, when she was a child subject of Project Silencio.

The amp was playing her own terror back to her, warping her present.

Elias didn’t smash the speaker. He couldn’t. Instead, he plugged his Walkman into the IRS input and played a single sound: silence. But it was a digital silence—a 24-bit null signal that forced the IRS circuit to resonate with itself.

The York Audio KW 412 M25SH IRS began to glow at the cone edges. A harmonic feedback loop built. The concrete floor cracked. Elias’s nose bled. Then, with a sound like a scream swallowed by a black hole, the speaker collapsed into its own magnetic field.

Silence.

The Aftermath

Mira woke up the next morning without the Shiver. She sent Elias a single text: “I remember everything now. Thank you.”

Elias looked at the blackened badge on his workbench. He knew there were more units out there. And somewhere, someone was still listening to the ghosts they had trapped in copper wire.

He soldered a new resistor into a broken Fender amp, hung a sign on his door—“No IRS repairs. No questions.”—and waited for the next ghost to find him.

End

York Audio KW 412 M25-SH an impulse response (IR) library designed to faithfully replicate the unique sonic footprint of a custom-built Kerry Wright 4x12 cabinet

. This specific cabinet was originally crafted for fusion guitar legend Scott Henderson and is loaded with vintage-voiced Celestion G12M 25W Greenback York Audio Core Features and Sound Profile The "Henderson" Tone

: The pack includes a dedicated "Scott Henderson" folder containing the exact mic placements he uses on his personal cabinet. Acoustic Characteristics

: It is known for a warm, thick low end, a "woody" vocal-like midrange, and an articulate top end that avoids harshness while maintaining string-to-string clarity. Stereo Room Captures : A standout feature of this pack is the inclusion of Stereo Room captures

and mixes designed to provide a natural "amp-in-the-room" feeling, particularly effective for headphone users. Versatility

: While based on a vintage-style Greenback, it is widely used for both classic Plexi-style tones and modern high-gain sounds, providing a "fat and clear" resonance. York Audio Included Content According to the KW 412 M25-SH product page , the pack typically includes: Individual Mic Captures The York Audio KW 412 M25-SH Cab Pack

: Multiple microphone options (such as the Shure SM57, Sennheiser MD421, and various ribbon mics) placed at different "sweet spots" on the speaker. Signature Mixes

: Expertly blended multi-mic IRs for "plug-and-play" use, including custom artist signature mixes for Jim Adkins of Jimmy Eat World. Hardware Compatibility : The files are provided in format, making them compatible with major modelers like Fractal Audio , Line 6 Helix, Kemper, and DAW plugins. York Audio User and Professional Reception

Scott Henderson himself has praised the pack, stating that it is "life-changing" because he cannot hear a difference between the IRs and his physical cabinet. Community reviews on The Gear Forum

frequently highlight York Audio IRs as a significant upgrade over stock cabinet simulations due to their mix-ready quality and detailed resonance. which microphones are included in this specific pack or how to load these IRs

into a specific modeler like the Fractal Axe-Fx or Line 6 Helix? AI responses may include mistakes. Learn more KW 412 M25-SH - York Audio

Overview

The York Audio KW 412 M25SH IRS is a 4-way, bi-amped loudspeaker system that boasts an impressive combination of power, precision, and versatility. This system is designed to deliver exceptional sound quality, making it suitable for a wide range of applications, including live concerts, festivals, theatrical productions, and installations.

Design and Construction

The KW 412 M25SH IRS features a rugged, tour-grade enclosure constructed from 3/4-inch plywood, with a durable, textured finish. The speaker system is comprised of four custom-designed drivers:

The drivers are carefully mounted in a proprietary, computer-optimized waveguide system, which helps to control dispersion and minimize unwanted resonances.

Acoustic Performance

The York Audio KW 412 M25SH IRS is designed to deliver exceptional acoustic performance, with a frequency response of 38 Hz to 18 kHz (-3 dB). The system's bi-amped configuration, featuring two dedicated amplifiers for the low- and high-frequency sections, ensures optimal power distribution and minimizes the risk of amplifier overload.

The M25SH woofers provide deep, articulate bass, while the mid-range driver offers clear, detailed reproduction of the critical midrange frequencies. The high-frequency driver delivers crisp, accurate treble, with a smooth, even dispersion pattern.

Key Features

Some notable features of the York Audio KW 412 M25SH IRS include:

Technical Specifications

Here are some key technical specifications for the York Audio KW 412 M25SH IRS:

Conclusion

The York Audio KW 412 M25SH IRS is an exceptional loudspeaker system, designed to deliver high-quality sound and reliable performance in a wide range of applications. With its bi-amped design, 4-way configuration, and computer-optimized waveguide, this system offers an unbeatable combination of power, precision, and versatility. Whether you're a live sound engineer, installer, or audio enthusiast, the KW 412 M25SH IRS is definitely worth considering.

If you buy this pack for high-gain (think 80s metal, hard rock, or modern prog), start here.