About the brand

Auditorium 23 is as much research & development, experimenting and pioneering as production. It was established in 1980 and is owned and operated by Keith Aschenbrenner.

Those who have followed the history of Single-ended amplification and high efficiency loudspeakers certainly know of… and refer to A23 as an important cultural icon of classic design theory. If you have an appreciation for direct and immediate sound, both from your loudspeakers and your analogue, with a nod towards the sound of classic hi-fidelity, this is absolutely for you.

..one of the most stunning portrayals of the analogue kingdom I have ever heard – breathtaking! The vocal sheen and sibilance were gone and in its place was real flesh-and-blood vocal magic. The arm now conveyed music that was warmer, darker and fuller without losing any of the detail and snappiness that made it so engaging in my system. The notes became more liquid and fragrant too. Fed by the Auditorium 23…

Jeff Day

The step-up transformers, between your tonearm and your phono-pre, previously have been considered a type of compromise, (marrying moving coil cartridges to moving magnet phono stages in your system)… the A23 have been proven in our clients systems to surpass by a long shot the performance of active mc stages.

Detailed information on individual models and technical data are best found directly with the manufacturer. We invite you to connect with them here. We urge you to request specific demonstration or discussion with CDF directly for all of your questions.


  • Cables:
  • A23 Speaker Cables
  • A23 Interconnect


  • Phono Step Up Transformers:
  • A23 SPU Step Up Transformer
  • A23 103/EMT Step Up Transformer
  • A23 Hommage T1 Step Up Transformer
  • A23 Hommage T2 Step Up Transformer
  • Record Mats:
  • A23 Turntable Mat
  • A23 Hommage Turntable Mat


  • Speakers:
  • Homage Cinema Field Coil Speaker
  • Hommage 22A System
  • Hommage 755A Alnico Speaker
  • Hommage 4181
  • Hommage Ken 755A Alnico

Passion and motivation

I'd like to take moment to thank you for the warm welcome and time we spent together in your store earlier this week. I thoroughly enjoyed meeting you and understanding more about your business. I'm thrilled with your passion and motivation towards the high end of the audio world and…

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Spared no effort to ensure my satisfaction

Just a quick note to express my appreciation for the dedicated attention I received from the friendly folks of Coup de Foudre, particularly Graeme, and Jennifer. You spared no effort to ensure my complete satisfaction, and that's exactly what I received, complete satisfaction. Although I live 3 hours away from…

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Thanks for everything – including the scotch

Hi Jennifer It was great seeing and speaking with you at Salon Son et Image and thanks a lot for your invite. Everything was fantastic: the scotch, appetizers, and the most important  - great people! Many thanks for the great time! Oles  

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Repeat customer

Dear Graeme, I just wanted to thank you for the wonderful experience at CDFaudio. You definately have a repeat customer here! I went back home to listen to the same piece I heard on the Shindo setup and I get it! What I previously thought was warm and inviting was…

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Courteous and thoughtful

I want to drop you a quick thank-you note for being so courteous and thoughtful late Friday night. I sincerely was not expecting your hospitality, especially so close to your closing. I am impressed that you started up the VTLs for me even though there really wasn’t any time to…

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