Adcom GSP-560 - Manual (Page 10)

11) SOME NOTES ON VOLUME CONTROL USE
Once you've connected the GSP-560, a major functional change occurs in your system
The volume control of your original control center (preamplifier, integrated amp, or receiver) no longer adjusts total
system volume Instead, thatcontrolnowadjusts only front channel levels—the sound going to the left front and right
front speakers If you turn it down all the way, you'll still have output from the center and rear channels. Turning it up
all the way overshadows the center channel and therefore defeats the mam benefit of Pro Logic decoding Continued
use of this control will also alter the relative contibution of the rear channels to the overall soundfield, thereby reducing
the system's ability to recreate the sonic experience intended by the soundtrack’s creators
In effect, the level control on your system’s original control center SHOULD BE SET ONCE, THEN IGNORED. The
best way of doing this is to turn your control center's gam control to the position you previously associated with
comfortable to slightly loud listening. All subsequent adjustments will be done via the GSP-560’s front panel “Master
Volume” control
O
or the pushbuttons on the GSP-560’s hand held remote controller®
12) INITIAL LEVEL ADJUSTMENTS
Because the GSP-560’s “Master Volume” control increases or decreases levels to ALL outputs simultaneously, it
IS the new level control for the entire system
However, you still must adjust the relative levels of the center and rear channels (subwoofer, too, if you are using one)
before you’re completely ready.
To do this, turn the “Master Volume” control ® to about 10 o’clock. THIS ISN’T A HARD AND FAST RULE —you’ll
know if you need to change this adjustment a bit after you’ve started the procedure detailed In Paragraph 15 below
13) SELECT DOLBY PRO LOGIC MODE
Without going into endless details, the Pro Logic decoding 1C in the GSP-560 is designed to accurately recreate the
original soundfield intended by the creators of the Dolby Surround encoded media you will be playing
14) INTRODUCTORY NOTES ON THE BALANCE CHECK CIRCUIT
The Balance Check circuit does exactly what its name implies. An internal signal generator interrupts the normal
audio information and sends a test tone to all loudspeakers sequentially. The test tone is a filtered broadband signal
close in overall balance to the normal distribution of tones encountered in real life
DO NOT PLAY ANY OTHER SOURCE THROUGH THE GSP-560 WHEN USING THE BALANCE CHECK
CIRCUIT:
if you need tooheck balances when playing a source, simply put the source on “Pause,” go through the
balance check routine explained in Paragraph 15, then resume playing the source
15) USING BALANCE CHECK
The goal of the balance check circuit is to enhance the spatial accuracy of your playback system by matching the
acoustic levelsof all system speakers in your room as closely as possible Once you’ve done this, any level differences
from left to center or from center to rear, etc , are differences intended by the creators of the original soundtrack, not
some unwanted aberration caused by the acoustics of your room
BECAUSE EVERY ROOM IS ACOUSTICALLY DIFFERENT AND THE RELATIVE CHANNEL-TO-CHANNEL
LEVELS WILL CHANGE AS YOU MOVE AROUND THE ROOM, WE STRONGLY RECOMMEND THAT YOU
PERFORM THIS CHECK FROM YOUR FAVORITE CHAIR USING THE GSP-560’S HAND HELD REMOTE
CONTROLLER.
a) Press the “Bal Check” button on the hand held remote controller® The tone generator will “step” through all
speakers sequentially beginning with the left front After approximately two seconds of left front output, the tone
will shift to the center channel
b) Use the “Center Level Up/Down” pushbuttons ® to adjust center channel output to match left channel volume
as closely as possible.