User manual BBE SOUND 882

[. . . ] A lower frequency may reach the listener's ear first or perhaps simultaneously with that of a higher frequency. In some cases, the fundamental components may be so time-shifted that they reach the listener's ear ahead of some or all of the harmonic components. This change in the phase and amplitude relationship on the harmonic and fundamental frequencies is technically called "envelope distortion. " The listener perceives this loss of sound integrity in the reproduced sound as "muddy" and "smeared. " In the extreme, it can become difficult to tell the difference between musical instruments, for example, an oboe and a clarinet. conducted extensive studies of numerous speaker systems over a ten year period. [. . . ] This control regulates the amount of phase corrected treble frequencies. BBE FUNCTION: This push button switch allows for quick comparison of processed with unprocessed sound. When the switch is pushed in, the process is on and the indicator LED is green. When the switch is out, the process is off and the indicator LED is yellow. POWER: This switch controls primary power to the BBE 882. 3 w w OFF REAR PANEL CONNECTIONS 1 2 3 4 5 1. For all other models, replace with 250Vac, . 125A Fastblow type fuse. ) 3. OUTPUT: The output of the BBE 882 can be taken from the 1/4" stereo TRS Phone Jack or the XLR Jack. This allows both outputs to be used simultaneously, eliminating the need for a "Y" cord in the event multiple, balanced outputs are required. If both outputs are being used, a minimum of a 22k Ohm load per device is required. (The "load" is determined by the input impedance of the next subsequent component in the signal chain. ) The maximum output is rated at +23dBu. NOTE: Actual output level will vary due to the selected position of the BBE Process, and the actual input signal level. If both the XLR and Phone Jacks are being used, both must be either balanced or unbalanced. Although is can be either a TRS 1/4" stereo Phone Plug or an XLR Plug, it is recommended that only one input source be used. Both jacks are the same point electronically, however, due to the input/output impedance characteristics of most audio devices, a loss of signal may occur and/or damage to a component if both inputs are utilized. CHANNEL A: These connections function the same as CHANNEL B. 4 Specifications Frequency Response, process mode: . . . . . . . . . . . . . . . Program controlled bypass mode: . . . . . . . . . . . . . . . 10Hz to 50kHz +/-0. 5dBu, 0dBu input Signal to Noise: . . . . . . . . . . . . . . . . . . . . . . . . -92dBu THD, process mode: . . . . . . . . . . . . . . . less than 0. 025% at -0dBu input, 20-20kHz bypass mode: . . . . . . . . . . . . . . . less than 0. 002% at -0dBu input, 20-20kHz Maximum Output: . . . . . . . . . . . . . . . . . . +23dBu (may vary due to control settings) Input Impedance: . . . . . . . . . . . . . . . . . . . . . 14. 7k Ohms, balanced 1/4" TRS phone jack or XLR jack Pin #2 hot or "+". Output Impedance: . . . . . . . . . . . . . . . . . . 600 Ohms, balanced 1/4" TRS phone jack or XLR jack Pin #2 hot or "+". Sensitivity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -45dBu for maximum process Maximum Process: . . . . . . . . . . . . . . . . . . +12dBu boost at 5kHz, 0dBu input Lo Contour: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +12dBu boost at 50Hz, 0dBu input * 0dBu = 0. 775mVrms Power Requirements: . . . . . . . . . . . . . . . U. S. , Canada & Japan models: 120VAC, 50/60Hz, 8 WATTS Standard model: 220VAC, 50/60Hz, 8 WATTS Fuse: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace with the same type FASTBLOW fuse U. S. , Canada & Japan models: 250Vac, 1 /2A Fast blow type fuse. (Placing the BBE 882 after the EQ is recommended. ) If the EQ is being used for drastic tone alteration, the recommended placement would be before the EQ. Neither of these configurations will harm the BBE 882. 5 LIVE APPLICATION: NON-POWERED MIXER Connect the BBE 882 to the output of the mixing console. The output of the BBE will drive either a crossover or a power amplifier directly. (If an equalizer is being used, refer to "BBE and Equalization" section under "General Operation. ") 6 LIVE APPLICATION: POWERED MIXER There are a couple of ways to configure the BBE 882 into a powered mixer. The ideal method would be into "Pre-Amp Out/Power Amp In" section of the console. [. . . ] With DVM set to AC volts, measure the channel A [B] 1/4" jack output. With the process "IN", DVM should read -9dBu (+/-1dBu) and the Process "IN" LED should be on. With the Process "OUT", DVM should read -10dBu (+/-1dBu) and the Process "OUT" LED should be on. Return both channels Process and Lo Contour controls to minimum (C. C. W. ). [. . . ]