User manual BBE SOUND 202

[. . . ] WARNING: Describes precautions that should be observed to prevent the danger of injury or death to the user. CAUTION: Describes precautions that should be observed to prevent danger of the apparatus. WARNING · Power Supply Ensures the source voltage matches the voltage of the power supply before turning ON the apparatus. Unplug this apparatus during lightning storms or when unused for long periods of time. [. . . ] If the switch is in the ON position, the unit work as a Compressor or Limiter, depending on the setting of the controls. Please note that in the bypass mode, the input signal is still connected to all of the 202 circuitry, so that all the required controls can be used "Dry" that is without affecting the original signal. This, in conjunction with the GAIN REDUCTION meter, provides a powerful tool for comparing processed and unprocessed signals prior to operating the bypass switch and going "live". · GAIN REDUCTION METER This meter provides a convenient visual indication of the amount of gain reduction that is taking place at any time. If a signal exceeds the input level of the threshold point this function of the Compressor comes into play and the GAIN REDUCTION meter shows the actual measurement of gain reduction. 9 OPERATION bbE SECTION In order to address problems inherent in basic loudspeaker design, BBE Sound, Inc. The first adjusts the phase relationship of the low, mid and high frequencies. Since a loudspeaker¹s natural tendency is to add progressively longer delay times to higher frequencies, the BBE circuit adds progressively longer delay times to lower frequencies. This creates a kind of "mirror" curve to the time delay curve in the speaker and neutralizes its distorting effect. The second major element in the BBE system is the augmentation of the higher and lower frequencies. Loudspeakers tend to be less efficient in their extreme treble and bass ranges. This setting would generally suit the lowest frequency components present. For general dynamic-range control using the compressor mode, this is of no serious consequence. However, in a limiting mode, we are restricting the peaks of our signals to a maximum operating level to avoid distortion in any subsequent devices. If we are using a conventional compressor in a limiter mode, the result will be in very fast high frequency signal transients passing through unaffected by gain reduction. It is therefore necessary to choose the limiter control times precisely in order to govern any kind of transients. In order to use the 202 as a peak limiter, it is necessary to operate the unit in limiter mode (RATIO control turned fully clockwise) and to switch out the AUTO function. This enables the limiter function to exclusively and instantaneously respond to signals which exceed the threshold level. It is important that the AUTO switch is switched off and that the attack time is as short as possible to avoid any audible distortion. The RELEASE control should be set to a value whereby side effects such as "flutter" and "pumping" etc. 0 APPLICATIONS APPLICATIONS In this section several typical applications of the 202 are discussed. Please take the time to study the application examples carefully to make full use of the 202s capabilities in the future. [. . . ] For this purpose, the 202 is used as an automatic fader and is controlled by the announcer's microphone, which is connected to the SIDECHAIN input via a preamplifier. The music output and the announcer's voice, are then mixed. This application is known as "voice over" compression or "Ducking" and is commonly used in discos, radio stations, etc. · ANTICIPATED COMPRESSION If you feed the audio signal directly into the SIDECHAIN input and send the audio signal through a delay before the audio input, the 202 can anticipate the need for gain change. With experimentation, the effect can create a "zero" attack time at a given frequency. [. . . ]