Description
The AT-1 is a mono limiter closely based on the classic Fairchild 660 using all the original parts specified in original models of the day. The AT-1 is a Mono compressor with a stepped and tapered audio attenuator. It provides the user with more gain than the AT-101 and a rich tone. It has bypass, a key input stage, stepped AC threshold and stereo linking ability. All inputs and outputs are transformer balanced. Both AC threshold and gain reduction circuits can be split allowing the user to pass audio only through the tube input stage. The TC settings are the same as the stereo units with the same micro second attack times.
The AT-1 can also be used as an excellent De-esser where the ‘Key’ insert function is used. Sibilance can be removed effortlessly without any perception of the process bleeding on or around the ”Sibilance” band / frequency leaving your processed program smooth and transparent as before. When the Sibilance signal is split and run through a band-pass filter to isolate the offending frequency range it is then connected into the side-chain input of the of the AT-1 which only compresses the signal when this frequency is present. It is important to remember that to achieve this careful adjustment of the point where the compressor is triggered is needed as compression will begin at the point where the boosted Sibilance signal is present (careful adjustment of the TC settings is also necessary). An extreme version of this could be ‘ducking’.
