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API, In 1969, Automated Processes Incorporated was formed by engineers and musicians who shared a common vision: to create the highest possible quality professional audio gear, and then back it up with excellent customer service. 50 years later, that vision is stronger than ever and remains an integral part of API’s extraordinary success. Their official website is API.com.

A directory of user manuals and instructions for API products can be found below. API products are patented and trademarked under the brand API Group, Inc.

Contact Info:

Address: 8301 Patuxent Range Road Jessup, MD 20794
Phone: 301-776-7879
Fax: 301-776-8117

api 5500-AE Anniversary Edition Dual Equalizer Instruction Manual

Discover the specifications and usage instructions for the API 5500-AE Anniversary Edition Dual Equalizer in this comprehensive user manual. Learn about the dual channel equalizer's safety precautions, connections, and high-pass filter functionality to enhance your audio setup.

api 54-874-010 Threaded Miniature Spanner Filters Owner’s Manual

Discover all you need to know about the 54-874-010 Threaded Miniature Spanner Filters. Find product information, specifications, usage instructions, and maintenance tips. Ensure smooth operations for your applications with these efficient, 50 VDC voltage-rated filters.

api 527A Compressor User Manual

Learn about the API 527A Compressor in this user manual. Featuring feed-forward or feed-back compression, patented THRUST switch, and continuously variable controls for precise gain control. Discover the signature sound and reliability of API products with the 527A Compressor.

api TranZformer CMP Compressor Pedal User Guide

Learn how to use the API TranZformer CMP Compressor Pedal with this user guide. Featuring adjustable attack and release times, selectable compressor styles, and a wet/dry blend control, this versatile guitar effects pedal offers the classic API sound. Find out how to set up and use the TranZformer CMP for unbeatable sonic sculpting.