Equipment information

JBL 6215 Amplifier
Manufacturer
JBL
Model 6215
Date 1988
Category Audio, Video, TV, Multimedia
Group Amplifier
Description 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.

These manuals are available for the above equipment:

Manual Type Service and User Manual JBL-9809-Manual-Page-1-Picture
Pages 29
Size 2.94 Mbytes (3079354 Bytes)
Language english
Revision
Manual-ID/Number
Date 01 January 1988
Quality Scanned document, all readable.
Upload date
MD5 c14ad5e7b328be91022ff8f0900c47bc
Downloads 84 since 29 October 2017
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
JBL-9809-Manual-Page-1-Picture


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