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The creators of the very popular and almost legendary Rosen Digital impulse libraries moved on to start their own company called 3 Sigma Audio. The Rosen Digital collection still lives but has been rebranded by Lancaster Audio. The effective and innovative techniques used and created by Joe Quick and Chris Lucas in the development of the Rosen Digital collection have been carried over and further refined in the creation of 3 Sigma Audio’s products.

The Rosen products were done with the standard sweep method but 3SA came up with a proprietary capture and rendering method that is accurate within .1db across the entire frequency range. Other than that the only other differences are the addition of more impulses per pack and A/B variations.

What you get is a detailed and very high quality sound quality in an approach that condenses and simplifies the impulse selection process. You can find out all about the process and what you are buying when you buy 3 Sigma Audio products on their FAQ link HERE

3SA has a really diverse product line that covers a ton of ground tone wise. There are no weaknesses in their product line that we found. Every single product we tried was very strong and produced even stronger results. I know some people constantly think quantity when it comes to impulses but what they should be thinking about is quality. We all know that even great libraries have a number of impulses with mics or positions that not many people ever really use. What 3SA seems to have done is condense their selections based on the best mics, positions, blends and variations in power amps etc. They then put their own touch on things to full optimize the impulses.


  • Bill Kelliher Collection (this pack is four cabs of perfection)
  • Zil Fat 412
  • Van H Collection
  • F Dragon 412
  • EV 5153ST
  • Sold 212


  • 65 Amps
  • Acoustic
  • Aguilar
  • Ampeg
  • Bad Cat
  • Blackstar
  • Bogner
  • Buddha
  • Carvin
  • Diezel
  • Dr.Z
  • DV
  • Egnater
  • Engl
  • EVH
  • Fender
  • Framus
  • Friedman
  • GK
  • Hughes & Kettner
  • Jackson
  • Laney
  • Mark Bass
  • Marshall
  • Mesa Boogie
  • Morgan
  • Orange
  • Paul Reed Smith
  • Port City
  • Randall
  • Roland
  • Schecter
  • Soldano
  • Suhr
  • Supro
  • Trace Elliot
  • VOX
  • Zilla

3 Sigma Audio have a wide range of really high quality products that include electric impulses, acoustic impulses, Kemper profiles, Helix Native presets and a ton of other great stuff that users can buy with confidence. Impulse wise you can get things in singles, signature packs and themed multi-cab packs. When you buy 3SA products, you get quality for a fair price and efficient ways to achieve great tones.