Pioneer VSX-AX5i-G Operating Instructions Manual page 42

Setting Up for Surround Sound
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1 SPEAKER SETTING should be selected.
If it isn't use the  buttons to select
it. Press the ENTER button.
The setup possibilities appear on your TV.
2 With the  buttons choose the
speakers that you want to set. Press
the ENTER button.
The setup possibilities appear on your TV.
3 Use the  buttons to choose the
number (YES or NO, X1 or X2) and the
size (LARGE or SMALL) for each set of
speakers. Press ENTER.
PLUS is also a possibility for the SUBWOOFER.
4 Repeat steps 2 and 3 for all speakers
channels.
5 Use the  buttons to select EXIT
and press ENTER.
Next, proceed to CHANNEL LEVEL below.
If you want to change a setting before proceeding
start over from step 1.
Memo:
If you have a subwoofer and like lots of bass, it may seem
logical to select LARGE for your front speakers and leave the
subwoofer selected. This may not, however, yield the best
bass results. Depending on the size and shape of your room
you may actually experience a decrease in the amount of
bass due to what is called low frequency cancellations. If you
have a subwoofer, listen to the bass response with the front
speakers set to LARGE and SMALL alternately and let your
ears judge which sounds best.
The safest option is to route all the bass sounds to the
subwoofer by selecting SMALL for the front speakers.