User manual BBE SOUND 482

[. . . ] 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. [. . . ] LED DISPLAY: The LED display is used to indicate the output signal level of the BBE 482. Each number on the front panel corresponds to the output signal level, measured in decibels. Example: The "0" indicates a 0dBu signal level, "-6" refers to -6dBu, and so on. Once an input signal level has been established, increasing the BBE PROCESS and LO CONTOUR will increase the output signal and cause more LEDs to illuminate. The Clip LED will illuminate at +15dBu, giving a 3dBu warning of the impending distortion at +18dBu, the actual clip point. 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 red. POWER: This switch controls primary power to the BBE 482. REAR PANEL CONNECTIONS 1 2 3 4 5 CALIFORNIA USA MODEL 482 US PATENT NO 4, 482, 866 AND OTHERS 1. For all other models, replace with 250Vac, . 125A Fastblow type fuse. ) 3. OUTPUT: The output of the BBE 482 can be taken from the 1/4" Phone Jack or the RCA Jack. This allows both outputs to be used simultaneously, eliminating the need for a "Y" cord in the event multiple 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 +18dBu. NOTE: Actual output level will vary due to the selected position of the BBE Process, and the actual input signal level. Although is can be either a 1/4" Phone Plug or an RCA Plug, it is recommended that only one input source is 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. 3 w w OFF Specifications Frequency Response, process mode:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Program controlled bypass mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Hz to 50kHz +/-0. 5dBu, -10dBu input process mode:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . less than 0. 025% at -10dBu input, 20-20kHz bypass mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . less than 0. 002% at -l0dBu input, 20-20kHz Maximum Output: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18dBu (may vary due to control settings) Input Impedance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47k Ohms, unbalanced 1/4" phone jack or RCA jack Output Impedance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 k Ohms, unbalanced 1/4" phone jack or RCA jack Sensitivity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -45dBu for maximum process Maximum Process: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +12dBu boost at 5kHz, -l0dBu input Lo Contour: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +12dBu boost at 50Hz, -l0dBu input * 0dBu = 0. 775mVrms Power Requirements: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . U. S. , Canada 8 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. Standard model: 250Vac, . 125A Fastblow type fuse Dimensions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19"(W) x 5. 5"(D) x 1. 7"(H) Shipping Weight: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 5 lbs. Note: Due to continuing product improvement, specifications and design are subject to change without notice. THD, General Operation THE BBE 482 IS A LINE LEVEL SIGNAL PROCESSOR AND IS TO BE CONNECTED PRIOR TO THE POWER AMP IN ANY AUDIO SYSTEM. [. . . ] A very conservative design philosophy has resulted in a piece of equipment which runs very cool and should give years of trouble-free service. 10 Calibration Procedure for the BBE 482 (REV/S/ON 1. 1) NOTE: THIS UNIT WAS TESTED AND CALIBRATED AT THE FACTORY. With Process control at minimum (C. C. W. ) DVM should read -11. 5dBu (+/-1dBu). With Process control at maximum (C. W. ) DVM should read +2dBu (+/-1dBu). With Lo Contour control at minimum (C. C. W. ) DVM should read -11dBu (+/-1dBu). [. . . ]