The York Audio KW 412 M25-SH impulse response (IR) pack is a premium digital collection designed for guitarists using modelers like Fractal, Helix, Kemper, or DAW plugins. It is meticulously captured from fusion guitar legend Scott Henderson’s personal Kerry Wright 4x12 cabinet, which is loaded with UK-made Celestion G12M 25W Greenback speakers. Core Features and Tonal Character
This pack is celebrated for its "mix-ready" quality, offering a sound that is often described as fat and clear at the same time.
Signature Tone: Expect a warm, thick low end, a "vocal" Greenback midrange, and an articulate top end that maintains note definition without being overly harsh or "sizzly".
Resonance: The cabinet has a low resonance frequency of 115 Hz, providing a deep, organic resonance that many users find more immersive than standard Greenback packs.
The "Scott Henderson" Folder: A standout inclusion containing Scott’s personal mic placements. These are labeled from bright (57-9) to dark (57-1), allowing you to match the IR to your guitar’s tone control settings. Microphones and Mixes
The library includes a vast array of individual microphone captures and curated multi-mic blends:
Dynamic Mics: Modern and vintage Shure SM57s (57m/57v), SM58, SM7, and Sennheiser MD421 (m/v).
Ribbon Mics: Royer R-121, Beyerdynamic M160, and the Shure KSM313.
Condenser Mics: High-end options like the Telefunken U47, ADK U67, and AKG C414. york audio kw 412 m25sh irs
Curated Mixes: Includes over 20 multi-mic mixes, plus custom "Signature Mixes" created for artists like Jim Adkins of Jimmy Eat World. Technical Specifications
The files are delivered in standard .WAV format at multiple sample rates to ensure compatibility with all major hardware and software:
Sample Rates: 96k (Strymon, Boss), 48k (Fractal, Line 6, Neural DSP), and 44.1k (Kemper).
Resolution: 500ms for maximum detail, with natural and minimum phase versions provided.
Stereo Options: Features "Stereo Room" captures and "Stereo Mixes" (STM) designed to provide a natural "amp-in-the-room" feel, especially when using headphones. Best Use Cases
While it shines for classic rock and fusion tones, its versatility makes it a favorite for: York Audiohttps://www.yorkaudio.co KW 412 M25-SH - York Audio
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). The York Audio KW 412 M25-SH impulse response
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. Character: These speakers are famed for a frequency
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
I searched for “york audio kw 412 m25sh irs” , but this specific string does not appear to match any known commercial product, vintage audio component, or industry designation.
It seems likely this is a typo or a string of numbers/letters from multiple sources (e.g., a York Audio speaker cabinet model, an M25SH driver code, and “IRS” possibly referring to Infinity’s IRS reference speakers or a parts inventory system).
Below is a helpful essay-style breakdown of how to interpret and resolve this, plus guidance on finding what you actually need.
The "M25SH" designation refers to the specific driver load: the Celestion G12M-25, colloquially known as the "Greenback."
The York Audio KW 412 M25SH IRS is a solid, professional-grade purchase. It is the definitive digital representation of a classic greenback 4x12. If you seek that Led Zeppelin II, Van Halen I, or JCM800 crunch tone in the box, this IR pack is an industry benchmark. For modern metal or extended-range guitars, pair it with a separate low-end IR or use York’s DV-77 or V30 packs.
Recommended for: Classic rock, hard rock, punk, stoner rock, doom, and any guitarist wanting to "vintage-ize" a modern high-gain amp.
If you’ve bought IRs before, you know the problem: many sound "flat," "boxy," or have that annoying "blanket over the amp" feeling. York Audio solves this with three proprietary philosophies.