• Accent Speaker Technology Ltd. (Nola)
Manufacturer of Nola speakers (formerly Alon).
• Ack! Industries
Local manufacturer of dAck! battery powered filterless digital-to-analog converter.
• Acoustic Reality
Danish manufacturer of pyramid-shaped preamps & triangular-shaped digital switching amps.
• Atma-sphere
World's premiere OTL and triode amplifier manufacturer using a Balanced Differential Design®.
Located in St. Paul, MN.
• Audio by Van Alstine
Manufacturer of solid state amps & preamps.
• Audio Machine & Design
Audiopoints equipment racks and stands, Sonoran audio cabling, & Harmonic Precision amps & speakers.
• Berendsen Audioelektronik
German manufacturer of reasonably priced, highly-regarded solid state amps, preamps and CD players.
• Black Dahlia
Dick Olsher's site and home of Samadhi speakers and his wife Leslie's recordings.
• Cary Audio Design
A North Carolina-based manufacturer of highly-regarded tube amplifiers, preamplifiers and CD players, as well as solid state Home Theater electronics.
• Cruz (Digital Amps)
Manufacturer of “not from this world” Class-D digital amplifier designs.
• Daedalus Audio
A Washington-based company that manufactures audiophile speaker and Home Theatr speaker systems.
• DaVinci Audio
Swiss manufacturer of single ended tube amplifiers, preamplifiers and speakers.
• Decware
Small, direct sales manufacturer from Peoria, IL that produces the Zen line of vacuum tube-based preamps & amplifiers.
• D+S Sound Labs
Home theater speaker system manufacturer in Florida.
• Empirical Design
A compamy from Oregon that manufactures high-end audio analog and digital interconnects, speaker and power cables, and computer cables. They sell primarily to end users over the Internet. They also recently started modifying audio components. Their modifications include improving power delivery, signal paths and digital circuitry where applicable. They modify mostly DVD & CD players, DACs and solid-state amplifiers.
• eXemplar audio
A compamy that build tube electronics, offers modification services to upgrade and enhance virtually any tube audio equipment, does custom designs and is the factory authorized agent for assembly of all Bottlehead products.
• Huff Loudspeaker Co.
Manufacturer of speakers using ceramic midrange drivers & ribbon tweeters.
• Joule Electra
Manufacturer from South Carolina, specializing in handcrafted, high-performance vacuum tube preamps & OTL amplifiers.
• Manley Labs
Home of Manley all-tube and Langevin home and professional audio gear.
• Martin Logan
Manufacturer of mostly electrostatic high-end stereo and home theater speaker systems.
• Modwright, LLC
A Washington-based company that specializes in modifications to stock audio electronics, giving the audio enthusiast and audiophile cost-effective upgrade solutions.
• Music Direct
Chicago-based catalog business specializing in audiophile recordings, accessories as well as analog and digital hardware.
• NuForce
A Milpitas, CA based manufacturer of high bandwidth (20 to 50,000 Hz), low distortion Analog Switching Amplifiers and preamps for high-end audio and Home Theater systems.
• PHY-HP
French company selling speaker drive units, cables and connecters.
• Reimer Speaker Systems
Small manufacturer of highly-regarded individually hand-built audiophile speaker systems based in Cody, Wyoming.
• Response Audio
Manufacturer of tube preamps.
• Ridge Street Audio Designs
A company based in LaPorte, IN specializing in high resolution, reference audio cabling. Now also producing the Sason Ltd. Granite loudspeakers.
• SAS Audio Labs
A manufacturer of tube amps and preamps.
• Signature Tech
A Milwaukee area manufacturer of the Signature line of tube amps and preamps, audiophile speaker and Home Theatr speaker systems and Sig-Lynx ultra-high-definition interconnect cables.
• Sound Lab
A manufacturer of electrostatic loudspeaker systems.
• SP Technology
A manufacturer of speakers from La Porte, Indiana.
• Van L SpeakerWorks
A local, Chicago-based manufacturer of speakers using a crossfeed ambience enhancement system.
• Von Schweikert
A manufacturer of speakers.
• Wire Monkey
Manufacturer of tube preamp chassis and other DIY accessories.
• ZU Cables
Manufacturer based in Ogden, Utah, specializing in high-performance speaker, interconnect power and headphone cables, as well as several highly rated speaker systems.

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