Sony STR-DE725 - Manual (Page 12)

Speaker impedance
To enjoy multi channel surround, connect front, center,
and rear speakers with a nominal impedance of 8 ohms or
. higher, and set the speaker IMPEDANCE SELECTOR to
"8ii.” Check the instruction manual supplied witlfyour
speakers if you're not sure of their impedance. (This
information is usually printed, on a label on the back of
the speaker.)
You may connect a pair of speakers with a nominal
impedance between 4 and 8 ohms to the FRONT
SPEAKERS terminals, if you set the IMPEDANCE
SELECTOR to “4D" but you will not be able to enjoy
multi-channel surround sound.
Note
Be sure to connect front speakers with a nominal imptedance of 8
ohms or higher if you want to select both sets (A+B) of front
speakers (see page 21).
Multi-Channel Surround
Setup
For the best possible surround sound all speakers should
be the same distance from the listening position (O)-
(However, this unit lets you to place the center speaker up
to 5 feet (1.5 meters) closer (©) and the rear speakers up
to 15 feet (4.5 meters) closer (©) to the listening position.
The front speakers can be placed from 3 to 40 feet (1.0 to
12.0 meters) from the listening position (O)-)
Do not place the center or rear speakers farther away from the
listening position than the front speakers.
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