Unable to find satisfactory audio equipment from even the leading audio equipment manufacturers, audiophile David Schulte decided to begin modifying and constructing his own equipment. Breaking down models from a variety of brands, David Schulte reassembled them with higher-grade components and circuits in crucial areas. After extensive experimentation David Schulte identified the best methods of refurbishment to maximize the quality of audio output. Having mastered the upgrade process of audio equipment, David Schulte founded The Upgrade Company, LLC, through which he offers the same services to other audiophiles interested in improving their sound systems. He provides upgrades and modifications to 20 different component brands, including Ayre Acoustics, Classé Audio, Pioneer Electronics (USA) Inc., and Emotiva Audio Corporation. In addition to improving audio equipment sent in by customers, he also sells a Signature Series line of equipment that has been purchased new and modified to the standards of The Upgrade Company. Conscious of customer’s potential qualms regarding the disassembly of their audio equipment, David Schulte assigns a 14-day buy-back satisfaction warranty and a 5-year warranty on the parts and labor for each of the units he upgrades. If a customer is not satisfied with the quality of audio produced by his or her refurbished items, he or she may return it within 14 days for a refund. For the Signature Series, he matches the manufacturer’s warranty on the new units. David Schulte offers free shipping within the continental United States, and international shipping options are available for foreign customers. He accepts payment via check, money order, or credit cards specified on his company site.