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OwnHammer

412 MRBW GNR M25 MMMC

412 MRBW GNR M25 MMMC

$15.99 USD
$19.71 USD $15.99 USD
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The 412 MRBW GNR M25 Massively Multi-Mic Collection (MMMC) impulse response library captures and is seeking to recreate the sound of a 1971 Marshall 1960B 4x12 closed back cabinet with basketweave salt-and-pepper grillcloth loaded with pre-Rola Celestion 75 Hz G12M-25 speakers.

Originally released in 2018, this library's sound and feature set has been remade in 2025 to be easier to navigate and use with today's tools, workflows, and upcoming OwnHammer software.

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Not only is this type of vintage cabinet and speaker of the most legendary and sought after configurations in Rock and Roll history since its introduction in the 1960's, used by some of the most iconic players to pick up the instrument of electric guitar, but this EXACT specimen was used for the primary guitar parts on the album "Chinese Democracy" by Guns N' Roses, making it a specific part of Rock and Roll history which has now been immortalized for personal use through this impulse response library product.




VOICINGS


The speaker was shot in such ways as to result in three distinct voicings:
GNR = Greatly Neutral Response
MED = "Median"; between GNR and RAW
RAW = wild, hairy, and untamed



GNR
MED
RAW




MICROPHONES


Condensers

C12
C30
C32
C67S
C67T
C70
C84 		C87S
C87T
C88
C200
C414
C2011
CIWI
Dynamics

D5
D6
D7B
D20
D30
D57B
D57M 		D57V
D58
D88
D201
D409
D421M 		D421V
D441
D545M
D545V
D549
D906
Multi-Element

M2500 		Ribbons

R92
R121
R160
R313
RFAT




CUSTOM MIXES:

Three different multi-mic mix groups are provided, each with their unique sounds and inherent options:

Custom Mixes
a large assortment of mix types that were created after the initial release

Legacy Mixes
the mix types from the original release

Mic Pair Mixes
all dual mic combination permutations






FILE FORMAT:

All impulse responses in this library are provided in wave audio (.wav) file format, which is compatible with most hardware and software loaders. All files are mono channel count, 24-bit, have been minimum phase transformed using a proprietary algorithm, and provisioned in 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz sample rates.


COPYRIGHT NOTICE

OwnHammer products are licensed, not sold. Purchasing content from OwnHammer grants you temporary license to use the products, but does not grant ownership or rights to redistribute or create derivative works, all of which still belong solely to OwnHammer, LLC. For more information, please see the TOS and EULA.





Frequently Asked Questions




If the platform in question accepts wave audio format (.wav) files in 24-bit resolution, mono channel count, and at 44.1, 48, 88.2, or 96 kHz sample rate: YES!

PLEASE NOTE: any technical difficulties that an individual may encounter are NEVER the fault of the IR, and AWLWAYS the fault of the loading platform or the individual attempting to load it. Whether it is a USB driver issue, multi-file array import issue, user error, etc, you will find that if you take any file you may have an issue with and load it into a product from a different manufacturer, that the problem goes away. For this reason, technical support is not offered regarding impulse response libraries, as it is ALWAYS the loading platform that is the culprit and NEVER the IR. Therefor, the burden of support is ALWAYS on the loading platform manufacturer/developer, and will not be permitted to be outsourced to OwnHammer.




OwnHammer is not the appropriate resource for such a question, nor officially qualified to answer on behalf of any 3rd party entities regarding their products' functionality. Rather, this responsibility lies with the 3rd party platform, either via their provided documentation or customer support system.

OwnHammer wave audio format IR's are 24-bit, and in 96, 88.2, 48, and 44.1 kHz sampling rates, should you need to confirm those specifics against 3rd party documentation or with 3rd party platform support.

In the event that the platform in question finds itself in the below list, some information on known/submitted platforms and their native operating formats and requirements can be found at:

Tutorials :: File Formats




As stated in the above two entries, OwnHammer is not the appropriate resource for such a question, nor officially qualified to answer on behalf of any 3rd party entities regarding their products' functionality. Rather, this responsibility lies with the 3rd party platform, either via their provided documentation or customer support system.

While not constituting nor substitute for official 3rd party documentation or media, the following tutorial pages contain information and media that may be helpful :

Tutorials :: Fractal Audio
Tutorials :: Kemper Profiler
Tutorials :: Line 6 Helix




Product recommendation and usage consultation are not services that OwnHammer provides.