OPTIMOD-AM is a powerful system for obtaining the best possible quality from the AM broadcast medium. This medium includes the transmitter plus the listener's receiver, listening environment, and ear. OPTIMOD-AM is therefore configured to enable the station to pre-correct for certain unsatisfactory receiver characteristics, and to compensate for typical AM listening environments, like autos. Some receiver problems include extreme high frequency rolloff and moderate to severe bass rolloff; listening environments often contain high ambient noise which require considerable compression of program dynamic range to produce comfortably listenable sound. OPTIMOD-AM's built-in equalizer is capable of performing equalization which will accurately correct for the high frequency rolloff in an AM receiver which Orban/Broadcast's extensive research into the characteristics of AM receivers has defined as "typical". And OPTIMOD-AM's compressor and limiter circuits are capable of high degrees of dynamic range reduction with an unprecedented lack of side effects. A receiver that is "typical" right now may well be "atypical" in future years. In addition, the use of extreme high frequency equalization makes tuning of the receiver more critical than such tuning with little or no equalization. For this reason, the equalization and other system parameters have been made completely adjustable; the system can be operated with extreme equalization, flat, or anywhere in between. The completely-adjustable dynamic signal processing (including the Six-Band Limiter section and the "Smart Clipper" peak limiter) is uniquely suited to the task of conditioning a highly preemphasized signal so that it can be broadcast without objectionable distortion, loss of loudness, interference to other stations, or audible "action". Such "action" is often the indirect result of the large amount of high frequency energy which is rolled off at the receiver, but which may cause poorly designed audio processors to punch holes in the audio, to cause severe intermodulation distortion (such as splattered "esses"), and/or to produce other audibly unpleasant effects.