Parasound 275 manual Rear Panel Connections and Controls, Connection Precautions, Loop Jacks

4REAR PANEL CONNECTIONS AND CONTROLS

Connection Precautions

Disconnect the AC cord before making or changing any input, trigger, or speaker wire connections. Make sure there is no strain or tension on any wires that could cause them to pull loose.

275 Two Channel Amplifier

Parasound Products, Inc.

San Francisco, CA U S A

Manual Audio Sens 12V Trigger Ground

In Loop

Audio 12V Max Min Lift Norm

Auto Turn On

			High Pass Filter		R	Speaker Pair A	R	Speaker Pair B
						L		L
		L
									Load
		+
			Flat 20Hz	40Hz					Impedance
		R	Stereo	Mono
		Mono				Mono		Mono
		+	Bridging						2-3	4-8
In	Loop	Level			WARNING: To Prevent Fire Or Shock Hazard,		CAUTION: To Prevent Electric Shock, Do Not Remove Cover. No		Ohms	Ohms
					Do Not Expose This Unit To Rain Or Moisture.		User-Serviceable Parts Inside. Refer Servicing To Qualified Service Personnel.

AC

Voltage

115V 230V 60Hz 50Hz

AC 115V/60Hz AC 230V/50Hz

Power Consumption: 350W

In Jacks

Connect the shielded audio cables from your preamplifier or system controller’s output jacks to the Model 275’s L and R audio Input jacks. Use only the R channel jack for mono operation.

Loop Jacks

The jacks replicate the audio input signals to facilitate connections of other power amplifiers to the same preamplifier or system controller. Loop connection of multiple power amplifiers is called a “daisy chain.”

Note: You may loop the trigger connections of multiple Parasound power amplifiers without overloading the surround controller or preamplifier trigger outputs.

High Pass Filter

L

+

			Flat 20Hz	40Hz
		R	Stereo	Mono
		Mono
		+	Bridging
In	Loop	Level

R

Spea

R (Right) and L (Left) Level Knobs

You can increase the listening level for each channel by turning its Level knob clockwise or decrease by turning it counter-clockwise. The 275 has a gain of 28 so that its volume levels are compatible with other channels in your theater if they are driven by a THX-certified amplifier, up to the point where the THX-certified amplifier might play a bit louder because of its higher power output. We recommend setting the 275’s R and L level controls to 3 o’clock if you are driving it from a THX surround controller. This will avoid “clipping” and prevent audible distortion.

Note: You may wish to experiment with different gain settings on your preamp or a non-THX surround controller and on the Model 275 to find a combination of gain settings where your system’s background noise is lowest. Sound professionals call these adjustments “gain staging.”

Note: Only the R channel Level knob is used for bridged mono operation.