ClassicAPI 2 Channel Summing Amplifier and Booster

Projects > ClassicAPI 2 Channel Summing Amplifier and Booster

The 2-ACA-Bo from ClassicAPI provides a stereo summing solution for a host of applications. The PCB consists of four amplifiers: two inverting summing amplifiers and two booster amplifiers based on the API 325 card. Each amplifier uses a 2520-style discreet opamp and API-reproduction transformer from Ed Anderson. The 2-ACA-Bo is a great way to add API-style summing to a DIY mixer project or to add headroom and punch to an existing console.

Images courtesy of ClassicAPI

Notable Features:

  • Accepts any DOA in the API 2520 footprint
  • Employs Ed Anderson’s 2503 and 2623-4 transformers
  • Includes talkback input
  • Length: 5.5” Width: 6”
  • Can sum more than 40 channels!

Price: $17.50 for PCB

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One thought on “ClassicAPI 2 Channel Summing Amplifier and Booster

  1. I built one of these…can i mod it to use as a mic preamp… i have some input mic transformers (as used in Capi pre amps 312)..

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