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REAR PANEL CONNECTIONS AND CONTROLS continued
8
Note: If the controller’s trigger output is a + and - terminal, you can cut the 2.5mm plug off one
end of the included trigger wire and attach the bare wires to these terminals. The lead with
the white stripe on it corresponds to the plug’s tip and the unmarked lead corresponds to the
sleeve of the plug.
Note: If the trigger voltage source is DC, the trigger plug tip must be + (positive) and its
sleeve - (negative).
12V Out Jack
The Trigger Out jack lets you loop or “daisy-chain” the incoming trigger voltage to an additional
Model 275 or other component.
Note: The Model 275 trigger circuit draws a negligible 15 mA from the controller. The total load
on your controller’s trigger output(s) is the sum of the trigger current drawn by each of the com-
ponents you’ve looped together. Controllers can typically supply 150 mA at their trigger outputs.
Audio Trigger Sens (Sensitivity) Knob
The Auto Turn On Audio Sensitivity knob adjusts the incoming audio level or the “threshold”
required to turn on the Model 275. Its 12 o’clock position will be suitable in most cases. To increase
sensitivity for response to lower level audio signals, turn the knob counter-clockwise toward +.
Turn the knob clockwise toward - to decrease its sensitivity. This will prevent spurious noise
and switching transients in your system from false-triggering the Model 275.
Note: Plugging in the 275’s AC cord for the first time will usually create an internal power surge
that “false triggers” its Audio auto turn on, even if there’s no audio signal at its input jacks, and
it will remain on for 10-15 minutes after you switch it off. This is normal.
Ground Switch
Ground is the normal position for this switch. If you hear background hum in the speakers
connected to the Model 275, try setting the Ground Lift Switch to its Lift position. The Ground
Switch disconnects or “lifts” the audio circuit ground from the chassis ground. This often helps
to eliminate audible hum that results from ground loops. Ground loops are multiple ground
paths such as the metal-to-metal contact with the panels or chassis of other components
combined with the ground connections of the audio cables or even the ground wires of the
various AC cords.
AC Power Connections and AC Grounding
If possible, plug your Model 275 into the same AC outlet that your accompanying audio com-
ponents (especially then preamp or system controller) are plugged into. The ground potential
between different AC outlets may be higher or lower, resulting in audible hum.
WARNING: To Prevent Fire Or Shock Hazard,
Do Not Expose This Unit To Rain Or Moisture.
AC 115V/60Hz
AC 230V/50Hz
Speaker Pair A
L
R
Mono
Manual Audio Sens
Max Min
12V Trigger
Ground
Lift
Norm
Mono
Stereo
4-8
Ohms
2-3
Ohms
230V
50Hz
115V
60Hz
20Hz 40HzFlat
Audio
Auto Turn On Loop Level
Bridging
In
12V
In Loop
R
Mono
+
+
AC 115V/60Hz
AC 230V/50Hz
Power Consumption: 300W
AC
Voltage
Load
Impedance
275 Two Channel Amplifier
Parasound Products, Inc.
San Francisco,
CA U S A
CAUTION: To Prevent Electric Shock, Do Not Remove Cover. No
User-Serviceable Parts Inside. Refer Servicing To Qualified Service Personnel.
L
High Pass Filter
Speaker Pair B
L
R
Mono
WARNING: To Prevent Fire Or Shock Hazard,
Do Not Expose This Unit To Rain Or Moisture.
AC 115V/60Hz
AC 230V/50Hz
Speaker Pair A
L
R
Mono
Manual Audio Sens
Max Min
12V Trigger
Ground
Lift
Norm
Mono
Stereo
4-8
Ohms
2-3
Ohms
230V
50Hz
115V
60Hz
20Hz 40HzFlat
Audio
Auto Turn On Loop Level
Bridging
In
12V
In Loop
R
Mono
+
+
AC 115V/60Hz
AC 230V/50Hz
Power Consumption: 300W
AC
Voltage
Load
Impedance
275 Two Channel Amplifier
Parasound Products, Inc.
San Francisco,
CA U S A
CAUTION: To Prevent Electric Shock, Do Not Remove Cover. No
User-Serviceable Parts Inside. Refer Servicing To Qualified Service Personnel.
L
High Pass Filter
Speaker Pair B
L
R
Mono