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. [. . . ] This loss of level must be compensated for. A reduction in the output level is required if the operating level of subsequent equipment is lower (for instance, if the subsequent unity has a high sensitivity input). The switch is mainly used for direct A/B comparisons, which allows a comparison between the unprocessed and processed signal. When in the OUT position, all processing functions on the 202 are turned off. 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. has developed a circuit that has two primary functions. When not engaged, the control times can be set manually. Please note, while the AUTO switch is depressed the 202 does not provide a limiter function even if the RATIO control is turned fully clockwise because signal peaks are NOT radically cut off above the threshold point. If you want to use the 202 as an ultimate means of protection against overload, it is recommended to study the following chapter. THE LIMITING EFFECT The attack time is defined as the time taken for a compressor to respond to program levels which have exceed the threshold point. Because of the physical relationship between frequency and slew rate, the resulting factor is that for relatively low frequencies a longer attack time was required than for higher frequencies: any unpleasant dynamic distortion would be avoided. When compressing a program mix that includes a wide range of frequencies, a compromise must be made when setting the attack time. 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. [. . . ] Include a copy of the bill of sale with the unit when it is shipped to BBE Sound, Inc. As the repair turnaround time is minimal, we request that the unit be sent to BBE Sound, Inc. We also need to add reliability data to our files so that future revisions may be undertaken, if necessary, to improve the product. If unit has been purchased outside the US, please contact your national distributor. [. . . ]