JBL - 6290 - Amplifier
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JBL 6290
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Equipment:
6290
Date:
1988
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Information
The JBL Model 6290 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 an amplifier 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)”,
JournaI of the Audio Engineering Society, Vol. 25, No. 4,
April, 1977, pp. 170-177.)
This JBL amplifier uses multiple 200-watt output devices in
complementary configuration for high reliability and low
distortion. At rated power Into 8 ohms, these output devices
are operated at less than 25% of their rated power
dissipation. The benefit Is high reliability and long
component life.
Reliable operation Is ensured through the following
protection modes: current Is limited under Improper load or
drive conditions; output relays with front panel Indicators
protect the loudspeaker under conditions of DC offset or
excessive low-frequency transients. The relays also provide
power-up, power—down, and "brown out’1 muting to protect
loudspeakers from AC power transients. Clip Indicators allow
for system optimization.
The JBL amplifier may be operated In the normal stereo mode,
dual mono mode, or bridged mono mode. These modes are switch
selectable on the rear panel.
Active differential Input circuitry offers the benefits of
balanced operation without the use of Input transformers.
Input connections may be made via 3-pln 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 rack ears and heatsink of the amplifier are made of high
grade aluminum extrusions; the chassis Is fabricated of
heavy gauge steel. All Internal components are easily
accessible through removal of top and bottom panels. Front
panel graphic details are Incorporated on the rear-side of a
polycarbonate laminate which is virtually Indestructible.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
30
Size:
3.1 MB
Language:
english
Revision:
Manual-ID:
Date:
January 1988
Quality:
Scanned document, all readable.
Upload date:
Oct. 29, 2017
MD5:
edf21369-41c8-01cf-c610-8848e3b215fb
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526