Welcome to KOI

KOI, Inc., is a unique, dedicated speaker company headquartered in Framingham, Massachusetts, USA, with affiliated partner companies worldwide. KOI specializes in the design, engineering, and manufacture of extremely space- and power-efficient speakerPatented KOI HQ Driver systems that outperform conventional products many times their size.

Patented technologies, such as the extraordinary HQ Driver shown at right, make it possible for KOI to achieve levels of performance never before attained in such compact designs.

We invite you to learn more about KOI—the technologies, products, and company—via this website and hope you will contact us with your questions and comments.

For the best browsing experience at this site, please note the following.

Site Navigation

A floating menu will always appear at left regardless of where you are on the page.

If you wish to hide the menu at any time, click on the menu bar.

To reactivate the menu, simply slide your mouse pointer over the menu bar.

Clicking on the KOI logo will take you to our home page, namely this page.

Browser Version

This site is compatible with most recent-version browsers. If you experience any difficulty viewing this site, please report it to us.

Downloadable Documents

Most of the documents available for download at this site are in the Adobe Acrobat PDF format. Version 7 or newer of the Reader is required. Use the following link to download the latest version of the free Adobe (Acrobat) Reader:

Get Adobe Reader

Information for KOI Customers in Japan

KOI product owners residing in Japan may contact KOI directly via email regarding support issues. Please see the Contact page for more information.


Privacy Policy

The security of your personal information is very important to us. We never sell or rent your personal information to any third party under any circumstances. We value your trust very highly and will work to protect the security and privacy of any personal information you provide to us.

KOI and Other Trademarks

KOI and Human PsychoAcoustic are registered trademarks of KOI, Inc. All other trademarks herein are the properties of their respective owners.

Copyright Notice

© 2002–2017 KOI, Inc.
All images and text on this and connected pages are not in the public domain and are copyrighted with all rights reserved.