Summit Audio 2BA-221 Microphone And Line Module

Summit Audio 2BA-221 Microphone And Line Module



The 2BA-221 is made with the highest quality full-voltage tube and solid-state signal paths and the best components available.


Full-plate voltage matters

The proper amount of voltage to a tube and solid-state circuit can make all the difference in the quality of the sound. The 2BA-221 is made with the highest quality full-voltage tube and solid-state signal paths and the best components available. The 2BA-221 even has a separate, dedicated power source for its 48V phantom power, and does not draw current away from the main circuits.

Let signal flow

Integrating the 2BA-221 into your studio or live rig is easy given the comprehensive selection of input and output options provided. We designed the connections of the 2BA-221 with creative options in mind.
Variable tube output control

Another really cool feature is its variable tube output control, which provides access to a huge variety of tones, from clean solid state to rich harmonics and all sorts of variations in between. What a benefit to have one preamp and still have the advantages of many different sounds! The 2BA-221’s single 12AX7A Tube provides rich, warm tone and is easy to find and replace.

Really well built

The Summit Audio design philosophy considers the entire package when it comes to crafting gear. We pay special attention to the details of construction and have included many refinements over the years so units are durable enough to handle the rigors of the road. That is one of the reasons why you will find Summit gear on tour with many of today’s top touring acts around the world.

More sounds from a single microphone.

A primary design goal of the 2BA 221 was to provide an extreme amount of fine-tuning. One of the ways we achieve this is to allow you to variably adjust the mic input impedance. This opens up a wide variety of possible tones from a single microphone, turning a small mic locker into a much larger one by letting you tweak the way each of your microphones sound!

Hand-crafted in the USA

Each piece of Summit gear is meticulously crafted by hand in our shop using only the best quality components and attention to detail. Quality components and engineering know-how are the critical element to the sound and longevity of audio gear.

3 year warranty.

All Summit gear comes with a 3 year limited warranty

Internal power supply.

All Summit Audio products sport an internal high voltage power supply using an industry standard IEC connector.

SRK-100 rack mount.

The 2BA-221’s half rack design allows you to customize your setup according to your needs.


  • Variable Mic input impedance from 100 to 10K
  • Variable highpass filter
  • hi-Z Instrument-, line-, and mic-level input
  • hi-Z input and Mic input available simultaneously with separate gain controls
  • Separate solid-state and tube outputs
  • Insert jack
  • Stackable with more 2BA-221’s
  • Polarity switch and 20dB pad
  • One 12AX7A/ECC83 vacuum tube
  • Internal high voltage power supply
  • XLR and 1/4″ outputs and inputs
  • Three variable, independent gain stages




Additional information

Weight 1 lbs
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