GHE 1000V (serv.man2) - JBL Audio User Guide / Operation Manual

ghe 1000v (serv.man2) user guide / operation manual
Model
GHE 1000V (serv.man2)
Pages
8
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121.09 KB
Type
PDF
Document
User Guide / Operation Manual
Brand
Device
Audio
File
ghe-1000v-sm2.pdf
Date

Read JBL GHE 1000V (serv.man2) User Guide / Operation Manual online

GHE  SERIES 
LOUDSPEAKERS
OWNER’S 
MANUAL
GHE
G H E 1 0 0 0 V
G H E 1 2 0 0 V
S E R I E S
GHE Series Owners Manual  7/28/98 11:32 AM  Page 9
INTRODUCTION
Congratulations on choosing JBL GHE
Series Loudspeakers. Their high efficiency
and bass response will greatly increase
your enjoyment of recorded music. JBL
speakers are built with careful attention
to detail, using only the highest quality
materials. They will provide many years 
of excellent performance.
Your GHE Series Loudspeakers are very
easy to set up. We recommend that you
take a few minutes to read this owner's
manual before you begin, and follow the
instructions carefully.
ENGINEERING FEATURES
1.
High Efficiency. 
Modest amplifiers or
receivers will be able to produce acoustic
levels normally associated with amplifiers
of substantially higher power ratings.
2.
Video Shielding. 
The GHE Series 
incorporates magnetic shielding to allow
use on or next to video monitors and TVs.
The magnetic shielding prevents the 
powerful GHE speaker magnets from 
creating any interference or distortion of
the video picture.
3.
Bi-wiring Capability.
The GHE Series
speaker terminals are designed so that
separate sets of speaker cable can be
attached to the woofer and midrange/
treble portions of the crossover network. 
4.
Polypropylene Cone Midrange.
Pro-
vides clean, lifelike, accurate reproduction
of the human voice and other sounds
revealed by midrange frequencies.
5.
Tuned Port Bass Design. 
Extends low-
frequency response, reduces distortion
and improves power handling capacity.
PLACEMENT
The GHE Series cabinet height and driver
placement allow for speaker placement
directly on the floor. The video shielding
allows for the option of placement very
close to a video monitor/TV. When used
as Left and Right Channel speakers in a
Dolby Pro Logic AV system, the shielding
allows the speakers to be placed up
against the sides of the monitor/TV for a
compact AV system profile (see Fig. 1). If
you desire better stereo imaging when
using your speakers for both video and
audio, the speakers should be moved fur-
ther apart from each other, approximately
2 to 3 feet (.75 to 1m) from the sides of
the monitor/TV.
Fig. 1
For the best audio stereo reproduction,
the two loudspeaker systems should be
an equal distance from your listening posi-
tion and separated so that the angle
between them, at the listening position, is
between 40 and 60 degrees (see Fig. 2).
For example, if your listening position is 8
to 12 feet (2.5 to 4 m) from each speaker,
the two systems should be about 8 feet
(2.5 m) apart. Placing the loudspeakers 
in corners or against a wall will result in
the strongest (not necessarily the most
accurate) bass. Since the GHE Series are
ported on the front panel so you can place
the rear of the speaker up against a wall 
if desired.
Fig. 2
2
GHE Series Owners Manual  7/28/98 11:32 AM  Page 2
CONNECTIONS
To connect the loudspeaker systems 
to the receiver or amplifier, use two-
conductor insulated wire. Your JBL dealer
can recommend suitable cables, or you
can buy wire at most hardware or elec-
tronic stores. We recommend #16 AWG
wire as a minimum size. 
If planning to
use the bi-wiring feature, please read
that section of the manual for type of
speaker interconnect wire to use. 
If
your speakers are more than 30 feet 
(10 m) from your receiver or amplifier, use
larger diameter wire. Connections are
made at the terminals located on the back
of the loudspeaker system. The terminals
accept bare wire or dual banana plugs,
either of which will provide easy, secure 
connections.
Preparing the Hookup Wire
Carefully plan your wire lengths before
cutting any speaker wire. Be sure to allow
plenty of extra wire to help hide paths in
corners, along baseboards, etc.
1. First determine the wire length needed
between the most distant speaker and the
receiver or amplifier.
2. Now make the hookup wires for both
speakers this length, even if one loud-
speaker is much closer to your amplifier
than the other. This will help maintain
proper signal balance.
3. Strip off 3/8" of insulation from both
ends of each conductor.
4. Twist each set of thin wires into a 
tightly-bunched spiral.
5. At this point you need to identify a 
visual difference between the two conduc-
tors of each molded pair of speaker wire.
Differentiating marks can be a different
color wire (copper or "silver"); a strand 
of yarn in one conductor; thin, raised ribs
on one part of the outer insulation; or a
printed "+" marking on one of the insula-
tors. It does not make any difference
which of the two strands of wire go to (+)
and (–) on the speakers and amplifier, as
long as both speakers are connected
identically. If using wire ends, unscrew the
colored nut on the terminal cup, insert the
wire end into the hole in the metal post,
then retighten the nut until the wire is
tightly secured. If using banana plugs,
simply insert the plug directly into the
holes on the top of the metal posts.
For each channel, the red terminal on the
loudspeaker should be connected to the
red or (+) loudspeaker connection terminal
on the receiver or amplifier, and the black 
to the black or (–) speaker conection ter-
minal (see Fig. 3). Connecting the loud-
speakers in this manner ensures that they
will be in phase; that is, work together
rather than in opposition. Connecting the
loudspeakers out of phase will not dam-
age them, but will result in less bass and
poor imaging.
Fig. 3
Hooking Up Multiple Sets of Speakers
If your receiver has two complete sets of
speaker terminals ("A" and "B"), it's possi-
ble to hook up an additional pair of speak-
ers for 
simultaneous
sound in another
room. However, some speakers may not
be usable as a second pair if you want to
play two sets at once. Before hooking up
another set of speakers besides your
GHE Series, check the following:
1. Your receiver or amplifier minimum
load 
impedance. Impedance is always
expressed in ohms and can be found in
the owner's manual that came with your
unit. For example, the following are typical
entries in receiver/amplifier owner's 
manuals:
A)100 watts RMS into 8 ohms, both chan-
nels driven, 20–20kHz with less than
0.02% THD.
Left 
Speaker
Amplifier/Receiver
Right
Speaker
Red Blk.
(+)
+
+
(–)
Red
R
L
Blk.
(+) (–)
GHE SERIES
3
GHE Series Owners Manual  7/28/98 11:32 AM  Page 3
B) 160 watts RMS into 4 ohms, both
channels driven, 20–20kHz with less than
0.02% THD.
2. The nominal impedance of the second
set of speakers. A pair of GHE Series
speakers when combined with another
pair of 8 ohm speakers will present an
impedance to the receiver/amplifier that is
approximately 4 ohms. This speaker com-
bination can be used with the receiver/
amplifier cited in B above. If the receiver/
amplifier has a specification similar to that
shown in A above, or if your second set of
speakers has an impedance other than 
8 ohms, you must consult the receiver/
amplifier manufacturer for clarification.
BI-WIRING
Caution: Before attempting a Bi-Wire
hook-up, take a few minutes to read
through this section and follow the instruc-
tions carefully.
The GHE Series speaker terminals are
designed so that separate sets of speaker
cable can be attached to the woofer (LF)
and midrange/ treble (HF) portions of the
crossover network. This configuration is
called 
bi-wiring.
Bi-wiring can provide several sonic advan-
tages and considerably more flexibility in
power amplifier selection.
Reduction of Intermodulation
The majority of current flowing between
an amplifier and speaker is devoted to the
reproduction of bass. In fact, 60% or more
of an amp's power is destined for the
woofers. When current flows through a
wire, it produces a magnetic field (EMF)
which expands and collapses at a rate
equal to that of the music's complex fre-
quency components. If a single speaker
wire must conduct the full musical fre-
quency spectrum, this preponderance of
low frequency information can interact
with or 
modulate
high frequencies. The
resulting 
intermodulation
can create 
audible changes to treble even before it
reaches your loudspeakers.
By using separate conductors for high 
and low frequencies (Fig. 4 & Fig. 6),
unwanted treble modulation is avoided.
Bass flows through one, treble through
another.
Amplifier Flexibility
Bi-wiring also allows you the option of
using separate stereo power amplifiers for
your left and right speakers. Using two
stereo amplifiers (Fig. 5) can not only add
sonic improvements but upgrade conve-
nience as well. From a sound standpoint,
dual amplifiers reduce intermodulation
between left and right channels, since a
complete set of input and power supply
circuits are devoted to each speaker. 
Dual amps also provide an easy power
upgrade path: you can start out with one
stereo amplifier then add a second one
later to quadruple power reserves. 
HF
LF
HF
LF
HF
LF
HF
LF
PREAMP
        PREAMP
w/Y-corded output
STEREO AMPS
STEREO AMPS
STEREO AMP
4
Fig. 4 – One Amp Bi-Wire.
Fig. 5 – Two Amp Bi-Wire.
GHE Series Owners Manual  7/28/98 11:32 AM  Page 4
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Download JBL GHE 1000V (serv.man2) User Guide / Operation Manual

Here you can read online and download JBL GHE 1000V (serv.man2) User Guide / Operation Manual in PDF. GHE 1000V (serv.man2) user guide / operation manual will guide through the process and help you recover, restore, fix, disassemble and repair JBL GHE 1000V (serv.man2) Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.