BASIC SETUP / SPEAKER SETUP continued
Hold the remote handset in your other hand; you’ll be able to make level calibration adjustments
using just your thumb to press its
thumbpad cursor
and
ENTER buttons
.
Hold the meter in the same position as you calibrate all channels. It is normal for the analog SPL
meter needle or numbers to jump around slightly during the level calibration.
Press
SHIFT
and
CAL buttons
to start the procedure. Press the
left
and
right cursor buttons
to
adjust levels so that your sound-level meter reads 75 dB (+5 dB on the 70-dB scale). This is the
level THX recommends.
After you set the level for your Sub, press the
cursor down button
so the menu cursor (
>
) is by
Exit. Press the
ENTER button
to save your settings and return to the Speaker Setup page.
Distance setup
Your sense of “being there” in a movie depends
on the sound from each channel’s speaker reaching
your listening area at the same relative time as it did
in the film studio’s mixing room. If the speakers in
the studio were equidistant from the engineer, but
your main speakers are three feet further from you
than your surrounds are, the sound from the main
speakers would reach you about 3 milliseconds
(0.003 sec.) late, and you might hear, say, a ghost
echo before the shot itself. To compensate, your
system would have to delay the sound from the
surround speakers by three milliseconds, enabling
the sound from the main speakers to catch up.
You can set delays by measuring the distance from
each speaker to your head when you’re seated in
your favorite viewing/listening position and enter-
ing it in the screen below.
The 7100 then translates each distance into a delay,
as sound moves at approximately 1 ms (millisecond)
per foot (or per 0.34 meters if you set “Distance
units” in the “Display setup” page to “Meters”).
If you select a distance to the left front speaker
that is greater than 2 feet (.34m) shorter or longer
than the distance to the right front speaker, the
display will warn: ”Left and right ch delay difference
exceeds 2ft (or .34m).”
This is a THX-recommended message; can you
place your speakers so their distances from your
seating position are within two feet?
Note:
The factory default setting for all channels =
10ft (3 meters).
24
Speaker setup
Size setup
Level setup
> Distance setup
7.1 Ch in All Large
Exit
LEFT AND RIGHT DELAY
DIFF. EXCEEDS 2 MS
Left and right ch delay
difference exceeds 2ms
Left
13ft
Center
11ft
> Right
10ft
Right surround
15ft
Right back
11ft
Left back
21ft
Left surround
14ft
Subwoofer
13ft
Exit
Distance setup
Left
13ft
Center
11ft
> Right
10ft
Right surround
15ft
Right back
11ft
Left back
21ft
Left surround
14ft
Subwoofer
13ft
Exit
