JBL AVA7 - Manual (Page 4)

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INTRODUCTION
Congratulations on your purchase of
this JBL Performance
™ Series AVA7
power amplifier! You have purchased a
product that embodies the best of what
JBL has learned about the emotional
power of audio reproduction in more
than fifty years of preeminence in the
field. This amplifier has been designed
and crafted to provide the user with
a high level of sonic performance.
Special attention has been paid to min-
imizing the number of components in
the audio signal path, resulting in
extremely low distortion, excellent
transient response, and wide dynamic
range. JBL products set new bench-
marks in audio technology, and, when
used as part of a complete JBL
Performance Series system, will bring
the ambience and acoustics of some of
the world’s greatest concert halls and
theaters into your home.
To obtain the best performance from this
amplifier, please be sure to completely
read this user’s manual and use the
AVA7 only in accordance with its
instructions.
FEATURES
The JBL Performance Series AVA7
power amplifier features the following:
Full Seven-Channel Operation
The AVA7 has been designed to inte-
grate well into the world of multichan-
nel audio. It is designed to reproduce
the latest development in home theater
audio – rear channels, in addition to
side channels – to produce a truly
enveloping sound field. When coupled
with a high-quality subwoofer amplifier,
it is a solid foundation on which to
build a high-performance home cinema
system that will astound the listener
with its power and realism.
High Power Capability
The AVA7 provides a satisfying 125
watts per channel of distortion-free
audio (<0.01% THD) into 8 ohms.
Because of their power capabilities,
JBL Performance Series amplifiers have
an extremely wide dynamic range, an
element critical to realistic home cinema.
Sound levels equal to those at original
performances are easily re-created in
even the largest of home listening
environments.
Auto Turn-On and Power-Sequencing
Circuitry
When used in a JBL Performance
System, the AVA7 can be turned on
automatically whenever the surround
processor is activated. No longer do
you have to get out of that chair to turn
on the various pieces of equipment in
your entertainment system; just one
touch on the remote control of the sur-
round processor, and you’re a few sec-
onds away from a truly impressive
audio presentation!
Modern amplifiers produce more
power per channel (and frequently
have more channels) than those of the
traditional two-channel stereo era. Due
to the high current demands of power
amplifiers at the instant of turn-on,
the AVA7 amplifier is equipped with
a power-sequencing circuit that
turns on each amplifier in a delayed
sequence, avoiding the large instanta-
neous current demand (and possible
circuit breaker tripping) that may occur
should more than one amplifier turn on
at the same instant.
Quiet Cooling
The AVA7 utilizes two fans to cool the
amplifier channels, ensuring long-term
reliability. To reduce fan noise to an
absolute minimum, a thermal-sensing
and control circuit, which senses
increases in temperature within the
amplifier and powers the fans at a
speed proportional to that temperature
increase, has been incorporated in the
JBL Performance Series AVA7. As a
result, the fan is never turning faster
than necessary, and most of the noise
that is generated is masked by the pro-
gram being listened to.
Comprehensive and Isolated Circuit
Protection
The AVA7 amplifier employs sophisti-
cated protection circuitry (one for each
channel) that senses many possible fault
conditions, such as shorted loudspeaker
wires or excess power demand, and
turns the affected channel(s) off until
the fault condition is removed, at which
time normal operation is automatically
restored. While protection of this sort is
not uncommon in today’s well-designed
amplifiers, a remarkable feature of the
JBL Performance AVA7’s protection cir-
cuits is that they are optically coupled
to the signal circuit; there is no direct
electrical connection between the sig-
nal path and the protection circuitry. As
a result, there can be no coloration of
the music, no interaction between pro-
tection and amplification, until certain
thresholds are exceeded, at which
point the channel(s) would turn off
completely.
INTRODUCTION AND FEATURES
AVA 7 OM (New) 6/20/05 3:50 PM Page 4