- AB International
- Offering American-made, professional-grade, high-end amplifiers.
- Amplifier Technologies Inc.
- Designing high performance multi-channel amplifiers.
- Atma-Sphere Music Systems, Inc.
- Building premiere triode, Class A, balanced OTL amplifiers and balanced all-tube preamplifiers.
- Ayre Acoustics, Inc.
- Designing and building superior quality audio and video equipment.
- Balanced Audio Technology
- Designs and manufactures innovative components for specialty home audio electronics.
- Bedini Electronics Inc.
- Manufacturers of fine audio enhancement equipment.
- Boostaroo
- Manufactures self powered headphone amps and audio splitters.
- Boulder Amplifiers, Inc.
- Manufacturer of high performance audio electronics.
- Crown Audio, Inc.
- Manufacturer of power amplifiers, microphones, and processing for the professional audio industry.
- Joule-Electra
- Manufactures hand crafted high end audio tube preamplifiers and amplifiers.
- Spectron Audio Inc.
- Manufactures high end square wave amplifiers.
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