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User's Manual
9
4. XLR Inputs
If your pream pli Þ er has XLR
out puts, connect them to these XLR
inputs. Use them instead of the RCA
inputs because balanced connections
offer su pe ri or noise rejection.
The female XLR inputs are wired
as follows:
Pin 1 is ground
Pin 2 is positive (hot)
Pin 3 is negative (cold)
Balanced connections pass the
input signal along two conductors. If
there is any external noise and in ter -
fer ence passing into the audio lines,
both conductors will receive the same
amount of noise. This noise is then
rejected in the balanced input stage of
the Cinema Grand AmpliÞ er.
+ -
+ -
+
-
+
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Banana
SpadeBare Wire
Dual-Banana
5. Current Source Outputs
and:
6. Voltage Source Outputs
The front left, front right, and center
channels each have a Voltage Source
output and a Current Source output.
The Voltage Source output has a
source im ped ance of ap prox i mate ly
zero ohms. The Current Source has
a source impedance of ap prox i mate ly
one ohm. The left rear and right rear
channels have Voltage Source out-
puts only.
The top post of each binding post
pair is the positive output, and con-
nects to the positive (red) post of your
speaker. The bottom post of each pair
is the negative, and connects to the
negative (black) post of your speaker.
The posts can accept bare wire,
spade terminals, and dual or single
banana connectors.
According to your musical taste,
you may select the Current Source for
driving elec tro stat ic, pla nar mag net ic
or ribbon speakers. Se lect the Volt-
age Source for driving sub woof ers.
For cone based sys tems, use either.
For a biwired system, use the Current
Source for midrange and treble driv-
ers, and use the Voltage Source for
the subwoofer(s). These are sugges-
tions only. By all means, please feel
free to ex per i ment with other wiring
options.
NOTE: The Current Source output
is a Voltage Source modiÞ ed to yield
a Current Source impedance of one
ohm. This cor re sponds ap prox i mate ly
to a vacuum tube ampliÞ er output im-
ped ance and constitutes the dominant
factor in the soundstage delivery of
classic vacuum tube power ampliÞ ers.
7. Current Source Fuses
Each Current Source output has an
in-line fuse to protect your speakers. If
one ever opens, there will be no out-
put to that speaker. Turn off the power
if you ever have to change a fuse.
8. IEC connector
The ampliÞ er comes with a detach-
able Linecord which attaches here.
Make sure it is Þ rmly pushed in place.
Connect the other end to an AC outlet
which is properly conÞ gured for the
type of plug and has the correct volt-
age for your model.
9. AC Line fuse
If this fuse fails, replace it with the
exact same type and current rating.
Note: Always unplug the
power cord from your AC
outlet before re mov ing the
fuse.
With a ß at ended screwdriver, push
the fuse carrier in slightly and turn it
counter-clockwise to release.
CHAPTER 1