Aphex Systems was founded in 1975 in Massachusetts by Marvin Caesar and Curt Knoppel, the inventor of the Aural Exciter™.

The first Aural Exciter™ units were available exclusively on the rental basis of $30 per minute of finished recorded time.

The unit became so popular, especially with the Los Angeles music/recording studio crowd, that Aphex had to move to Hollywood.

Recognizing that there was a much bigger market than just the rental business, Aphex started selling the professional units, and introduced two low-cost models: Type B and Type C. The Aural Exciter circuit is now licensed by a growing list of manufacturers, including Yamaha, MacKenzie, Gentner, Emu and Bogen.

Aphex is dedicated to the development of high-quality products for the professional audio, broadcast, fixed installation, touring-sound and home-recording markets. Through that dedication, Aphex has developed a number of industry-standard devices, such as the Compellor®, Dominator®, Expander/Gate™ and Expressor,™ plus the Model 1100 Two-Channel and Model 1788 Eight-Channel Ultra-Precision Remotely Controllable Microphone Pre-Amplifiers, and the Model 2020 Mk III Broadcast Audio Processor.

Each product contains one or more of the over 30 proprietary inventions (patented or patents pending). A key element of all the dynamics processing products is the firm's state-of-the-art Voltage Controlled Attenuator, the Aphex VCA 1001.

Another key element is Aphex' unique input and output circuitry. Using electronic servo-balancing techniques, the company's I/O stages offer all of the safety of audio transformers, but with pure sonic quality. Such circuits have made Aphex distribution amplifiers and level interfaces the "asked-for" products amongst engineers, producers and system designers that demand quality. Aphex offices, engineering laboratories, production and warehousing are located in a 16,000 square foot facility in Sun Valley, CA. All products are designed and manufactured in this facility.

Aphex products are proudly American... 100% owned, engineered, and manufactured in the U.S.A. Aphex™ is a registered trademark of Aphex Systems, Ltd. We are constantly striving to maintain the highest professional standards. As a result of these efforts, modifications may be made from time to time to existing products without prior notice. Specifications and appearance may differ from those listed or shown.

If you need to contact us, use the phone number below or our email contacts page HERE.

All of our products utilize proprietary circuitry developed and patented by us. We are extremely proud of the ingenuity of design and the manufacturing quality of our products. We love to hear from you, our customers, about your experiences with any of our products. Our customer support is unmatched in the industry, so please do not hesitate to contact us.

Our products are protected with the following patents:

Other US and foreign patents issued or pending.

The information presented on these web pages is copyright and published by Aphex Systems, Ltd. and may be procured in hardcopy by emailing us, calling, or writing the factory.

Our patented, proprietary circuitry is described by the following trade marks and/or service marks of Aphex Systems, Ltd:

Aphex, Aural Exciter, Automatic Limit Threshold, Big Bottom, Bass Enhancer, Compellor, Digitally Controlled Low Noise Amplifier (DCLNA), Distributed Pre-Emphasis Filter, Dominator, Drift Stabilized A/D Converter, Dynamic Verification Gate, Expressor, Easyrider, Frequency Dependent Leveler (FDL), High Frequency Expander, Improving The Way The World Sounds, LeNA, Locaf, Logic Assisted Gate, MicLim, Optical Big Bottom, Parallel Path Digital Modulation, Phase Coherent Crossover, Post Crossover Multiband Technique, Punch Factory, Reflected Plate Amplifier (RPA), Selectable Peak Accelerated Compressor, Split Band Clipper, Sticky Leveler, Thermionics, Transient Discriminate Harmonics Generator, Tubessence, Wave Dependent Compressor, Xciter.

Other trademarks, service marks, and logos, where shown or implied, are copyright their respective owners and are used with permission and/or in good faith and intent.  ©2003 - 2008 Aphex Systems, Ltd. All Rights Reserved.

Aphex is constantly striving to maintain the highest professional standards. As a result of these efforts, modifications may be made from time to time to existing products without prior notice. Specifications and appearance may be different from those listed or shown.

All Aphex products are UL or ETL Listed.

Our equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manuals / operating guides, may cause interference to radio communications. Operation of this equipment in a residential area is likely to cause interference in which case the user will be required to correct the interference at his own expense.

The user is cautioned that changes and/or modifications made to the equipment without approval of the manufacturer could void user's authority to operate this equipment.

It is suggested that the user use only correctly shielded and grounded cables to ensure compliance with the FCC rules.

Aphex products are tested and registered with the world's standards organizations, as applicable, and meet or exceed these standards for quality and safety. Operating the equipment outside of the specified design parameters voids the warranty and could be considered a safety hazard. It is possible to incur hearing damage, either temporary or permanent, by the auditory abuse of listening to loud music or test signals for an extended period of time. Please listen to and adjust your system responsibly. Sound pressure volume levels are, in some cases, regulated by community, state, and/or federal laws and standards. Aphex cannot be held responsible for damage incurred by the unsafe, unlawful, or illegal operation or installation of our electronic equipment.