Multiple Speaker Loads
The SI-275 is stable into very low impedance loads. This means you can safely
operate three pairs of 8 ohm speakers (a 2.67 ohm load) directly connected to the
SI-275. Note that the SI-275 does not have on/off speaker switching built in.
When the amplifier is on, so are all of the speakers. (for more information on
proper amplifier placement, see Installation Considerations on page 5, Figure 2).
Niles makes a number of different speaker selection and impedance matching systems.
Speaker selection systems allow each pair of speakers to be turned on and off from your
equipment location (or even via remote control). That way, you know that the speak-
ers in the bedroom are off so you can avoid waking a sleeping spouse! These speaker
selectors provide an easy way to terminate all of the wires for more than three pairs.
Testing and troubleshooting a new system is much easier with the individual room
labels and on/off switches of a Niles speaker selection system. Additionally, Niles
speaker selection systems offer impedance matching features which will allow you to
connect up to ten pairs of speakers to your SI-275 amplifier.
IN
S
T
A
L
L
A
T
IO
N
C
O
N
S
ID
E
R
A
T
IO
N
S
7
SPEAKER 6
L+
L-
R-
R+
AMPLIFIER
L+
L-
R-
R+
L+
L-
R-
R+
L+
L-
R-
R+
L+
L-
R-
R+
L+
L-
R-
R+
SPEAKER 5
SPEAKER 4
SPEAKER 3
SPEAKER 2
L+
L-
R-
R+
SPEAKER 1
CONSTANT
PROTECTION
ON OFF
Niles Audio
Corporation, Inc.
Miami, Florida USA
NILES
Niles SI-275
Niles HPS-6 Speaker Selection System
Speaker selection systems allow each pair of speakers to be turned on and off from your
equipment location (or even via remote control).
DS00219CMY-SI-275.qxp 6/7/05 3:18 PM Page 7
