In 1991, Aphex released the Model 320 Dual/Stereo Compellor as an updated replacement for the Model 300 Stereo Compellor. The principle functions were retained but many improve- ments were implemented as well as new convenience features to make the Compellor even easier to install and use. One such improvement was the conversion to a new and improved proprietary VCA chip, the Aphex VCA1001, to replace the now obsolete 1537A. The great success of the model 320 soon led to the Model 323 single channel Compellor with Aural Exciter to replace the older Models 301 and 303.
?The Compellor has become the world standard audio level controller. Understandably, we are very proud of that fact!
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?In 1994, Aphex introduced the current Compellor Models 320A and 323A. The model “A” revision signifies the inclusion of an improved patented Leveler circuit called the “Frequency Discriminate Leveler” (FDL) while all other aspects of the Model 320 remain the same. With the FDL, Compellors became even more transparent and useful than ever before.
Now, in 2003 (as this manual is being written), the Compellor is still the most advanced and effective audio level controller available. No all-digital products have been able to approach it. In this digital age, that builds a strong argument to add digital I/O capability to Compellors. This has been accomplished with the Model 320D which contains both analog and digital audio I/O capabilities.