California Duo


Released on December 02, 2016.

"212 3QTR" based on a MESA/Boogie® Three Quarter semi open back 2x12 cabinet.

  • "BLU" based on 1963 Celestion® T530 blue AlNiCo speakers.
  • "C90" based on Celestion® G12-80 MC-90 speakers.
  • "LYN" based on Celestion® G12-50GL Lynchback speakers.
  • "V30" based on Celestion® Vintage 30 speakers.

"412 TRAD" based on a MESA/Boogie® Rectifier® traditional straight 4x12 cabinet.

  • "H30" based on pre-Rola Celestion® G12H-30 speakers.
  • "M25" based on pre-Rola Celestion® G12M-25 speakers.
  • "V60" based on 60 watt Celestion® Vintage 30 speakers.
  • "V70" based on 70 watt Celestion® Vintage 30 speakers.

  • 6 industry standard microphones:
    57 - 70 - 121 - 160 - 414 - 421
  • 3 auxiliary capture types:
  • incremental position sweeps across speaker sweet spots
  • meticulously crafted proprietary multi-mic mixes
  • speaker mix permutations for each cabinet
  • major production/mastering grade signal chain

Please read this section carefully!

Wave Audio (.wav)

Wave audio format IR's (.wav) are compatible with convolution reverb type loaders in recording software and outboard hardware units and are provided in:

  • 24 bit resolution
  • 44.1, 48, 88.2, and 96 kHz sample rates
  • minimum phase transformed
  • mono channel count


If your platform cannot load .wav files, make sure you explore the free or commercial conversion applications available elsewhere for your device. As per Section 9. Terms of Sale of the Terms of Use Agreement, there are NO REFUNDS ON DIGITAL GOODS, which includes this library.

California Duo Overview
212 3QTR
Jon Symons
"Frail Hope"
212 3QTR
Jon Symons
"Trip Motion"
412 TRAD
Jon Symons
"Mark My Words"
(+ tutorial)
412 TRAD
Jon Symons
412 TRAD
Jon Symons
Jon Symons
Sound Like Metallica

Included File 01:

Included File 02:

Included File 03:

Included File 04:


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Any and all third party companies and products listed or otherwise mentioned on this site may be trademarks of their respective owners and are in no way affiliated or associated with OwnHammer, LLC. Product names are referenced solely for the purpose of identifying the hardware used in the equipment chain for impulse response capture or are examples of companion products. Use of these names does not imply any cooperation or endorsement.