JBL 6215 Amplifier
Manufacturer:
Model:
6215
Date:
1988
Class:
Type:
SubType:
Power Amplifier
Information
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.
Manual type:
Service and User Manual
Pages:
29
Size:
2.94 Mbytes (3079354 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
1988 01 01
Quality:
Scanned document, all readable.
Upload date:
2017 10 29
MD5:
c14ad5e7b328be91022ff8f0900c47bc
Downloads:
617
Information
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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