|JBL 6215 Amplifier|
|Category:||Audio, Video, TV, Multimedia|
The JBL Model 6215 power amplifier has been designed to meet the most critical professional sound requirements. It is rugged and road-worthy, conservatively rated, and can handle reactive loads with ease. The engineering design approach stresses the optimization of each stage, allowing high slew rate and relatively low loop gain. Overall feedback has been held to a minimum and is employed only to stabilize the gain and the operating point. This design approach results in amplifiers with excellent performance under the most demanding dynamic input and load conditions. As evidence of the stress on dynamic rather than static or steady-state distortion mechanisms, transient intermodulation distortion measures less than 0.03% by the DIM 100 test. (Leinonen, Otala, and Curl, "A Method for Measuring Transient Intermodulation Distortion (TIM)", Journal of the Audio Engineering Society. Vol. 25, No. 4, April, 1977, pp. 170-177.) Reliable operation of the amplifier is ensured through the following protection modes: Current is limited under improper load or drive conditions. An output relay, with front panel LED indication, protects the loudspeaker load under conditions of DC offset or large low-frequency transients. The relay also provides power-up, power-down, and "brown out" muting to protect loudspeakers from AC power transients generated anywhere in the signal path. LED's on the front panel indicate the onset of clipping and standby mode. The JBL Model 6215 amplifier may be operated in the normal stereophonic mode, dual monophonic mode, or bridged monophonic mode. Rear panel switching sets these modes, obviating the need for patch cords, level matching, etc. Active differential Input circuitry offers the benefits of balanced operation without the use of input transformers. Input connections may be made via 3-pin XL-type connector, three-conductor (TRS) 6.3 mm (1/4 in.) phone jack, or barrier strip. The barrier strip has separate terminals for audio ground and chassis ground. The five-way output binding posts are arranged on 19 mm (3/4 in.) center so that bridged as well as normal connections may be made with standard dual banana plugs, bare wire, or terminal lugs.
These manuals are available for the above equipment:
|JBL -- 6215 -- Service and User Manual|
|Manual Type||Service and User Manual|
|Size||2.94 Mbytes (3079354 Bytes)|
|Date||01 January 1988|
|Quality||Scanned document, all readable.|
|Upload date||29 October 2017|
|Downloads||36 since 29 October 2017|
SECTION I. INTRODUCTION 1 1.1 SPECIFICATIONS 2 SECTION II. INSPECTION AND INSTALLATION 5 2.1 UNPACKING AND INSPECTION 5 2.2 ENVIRONMENTAL CONSIDERATIONS 5 2.3 AC POWER 6 2.4 AMPLIFIER MODE SWITCH 6 2.5 EXTERNAL CONNECTIONS 7 2.5.1 INPUT CONNECTIONS, GENERAL 7 2.5.2 INPUT CONNECTION, DUAL MONO MODE 7 2.5.3 INPUT CONNECTION, BRIDGED MONO MODE 8 2.5.4 FIVE-WAY BINDING POST OUTPUTS 8 2.5.5 OUTPUT POLARITY AND BRIDGED MONO CONNECTION 8 2.6 INPUT IMPEDANCE AND TERMINATION 9 2.7 APPROPRIATELY RATED LOADS 10 2.7.1 IT IS THE USER’S RESPONSIBILITY TO AVOID OVERPOWERING 10 2.7.2 MORE ABOUT LOUDSPEAKER POWER RATINGS 10 2.7.3 SOMETIMES A LARGER AMPLIFIER CAN BE SAFER 11 2.7.4 REMEMBER THE DIVIDING NETWORK (CROSSOVER) 12 2.8 SPEAKER CABLES 13 2.8.1 TYPE OF WIRE 13 2.8.2 DAMPING FACTOR 13 2.8.3 CALCULATING LOSSES IN SPEAKER CABLE 14 2.9 GROUNDING 14 2.10 SECURITY COVERS 15 FIGURE 2-1 BALANCED INPUT CONNECTIONS 16 FIGURE 2-2 UNBALANCED INPUT CONNECTIONS 16 FIGURE 2-3 BARRIER STRIP CONNECTIONS 17 FIGURE 2-4 USE OF FIVE-WAY BINDING POSTS 18 FIGURE 2-5 OUTPUT CONNECTIONS TO TWO CHANNEL SPEAKER SYSTEM 18 FIGURE 2-6 BRIDGED OUTPUT CONNECTION TO MONAURAL SPEAKER SYSTEM 18 SECTION III. OPERATING INSTRUCTIONS 19 3.1 GENERAL 19 3.2 TURN ON AND SYSTEM CHECK 19 3.2.1 THERMAL PROTECTION 19 3.3 CLIP INDICATORS 19 3.3.1 ABOUT SENSITIVITY RATINGS 20 SECTION IV. THEORY OF OPERATION 21 4.1 INPUT DIFFERENTIAL AMPLIFIER 21 4.2 MODE SWITCH 21 4.3 SHORT CIRCUIT PROTECTION 22 4.4 RELAY DRIVER/OUTPUT DC DETECTOR 22 4.5 CLIP CIRCUIT 22 4.6 POWER AMPLIFIER 23 4.7 POWER SUPPLY 23 SECTION V. MAINTENANCE 24 5.1 GENERAL 24 5.2 REPAIRS AND WARRANTY 24 SECTION VI. SCHEMATIC DIAGRAM
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