Summit Audio 2BA-221 Microphone / Instrument Preamplifier

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  • Summit Audio 2BA-221 Microphone / Instrument Preamplifier
  • Summit Audio 2BA-221 Microphone / Instrument Preamplifier
  • Summit Audio 2BA-221 Microphone / Instrument Preamplifier
  • Summit Audio 2BA-221 Microphone / Instrument Preamplifier


The 2BA-221 is a high quality, hand-crafted microphone and instrument preamplifier with variable tube-output control. Featuring microphone level, line level, and Hi-Z instrument inputs, the 2BA- 221 utilizes separate and individually controlled solid state inputs to mix the microphone input with the Hi-Z or line input into the variable vacuum tube stage. Mix the signals through the 12AX7A/ECC83 vacuum tube output or output them separately through multiple solid state outputs.

The 2BA-221 also features a stackable input design. Multiple 2BA-221’s can be linked together to form a modular mixing device with individual outs, inserts per channel, and a final vacuum tube gain stage. Its swept high pass filter, multiple simultaneous tube and solid state outputs, insert jack, and internal power supply makes the 2BA-221 a powerful tracking and mixing tool.

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.

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.

Variable Mic Impedance
The 2BA-221 features a full rotary mic impedance selector which allows you to select an impedance from 100 Ohm to 10 kOhm. No matter what microphone you use, you can properly load it for the best sound with the 2BA-221!

High Pass Filter
Crucial for improved recording, the 2BA-221 offers a high-pass filter from 20 Hz to 200 Hz to remove unwanted low end.

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.

Studio and stage
Maintain control of your sound in the most demanding audio environments. Get world class sound in the studio and on the road with the time-tested quality and rugged design of Summit gear.

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.

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.

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

Optional Rack Mount Kit (SRK-100) Available Separately
The 2BA-221's half rack design allows you to customize your setup according to your needs.

3 year warranty.
All Summit gear comes with a 3 year limited warranty

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Size and Weight

  • Height:    1.75 inches (4.44 cm)
  • Width:    8.5 inches (21.59 cm)
  • Depth:    8.5 inches (21.59 cm)
  • Weight:    5 pounds (2.27 kg)

Power Configuration

  • Internal AC Supply
  • 20 watts, 115, 50 or 60 Hz (USA model)
  • Fuse size .5 amp, slo-blo for 100/115 V
  • Fuse size .25 amp, slo-blo at 230 V

Impedance Data

  • Mic: 1.5 k-ohms
  • Hi-Z: 10K-1.75M ohms
  • Output impedance: 150 Ohms


  • Mic Input: +4 dB Female XLR
  • Line Input: -10 dB 1/4" balanced
  • Outputs: +4 dB male XLR and 1/4" -10 dB balanced
  • Stacking Input/Output: -10 dB balanced

Max input level

  • Mic: -16dBu
  • Line: 22dBu
  • Hi-Z: 15dBu

Operating Measurements

  • Max output level (XLR): 25dBu
  • Max gain: 75dB
  • Equivalent input noise: -135dB average 10Hz-20kHz
  • Frequency response: 10Hz- 50kHz (-1dB)
  • Signal to noise ratio: 115dB average 10Hz- 20kHz
  • THD + Noise: 0.055%, -32dB in +4dB out, 1 kHz
  • Vacuum tubes: 12AX7A
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Additional Information

FREE SRK-100 Rack Kit:
With purchase of any 2 Summit Half-Rack Units!
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