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High Pass Filter Switch

The High Pass filter can improve the sound in virtually any installation. It’s called a “high pass” 
filter because it permits signals higher than 20 Hz and 40 Hz to pass, while preventing signals 
below these frequencies from passing.

-  The Flat switch position disconnects the filter and the 2250’s frequency response is flat.
-  The 20 Hz switch position filters out frequencies below 20 Hz. Your speakers have greater 

dynamic range and far less distortion when they don’t receive frequencies which are lower 
than they can reproduce. Likewise, the 2250 operates more efficiently when it’s not called 
upon to amplify frequencies which the speakers can’t reproduce. Because the 20 Hz filter 
has a steep 18 dB per octave slope, it is essentially a sub-sonic filter, and you probably won’t 
notice any loss of bass unless you’re using very large speakers. 

-  The 40 Hz switch position filters bass below 40 Hz at 18 dB per octave. This is ideal when the 

275 is driving in-wall or in-ceiling speakers because very few of them can reproduce very much 
bass below 40 Hz. You’ll enjoy much cleaner sound and higher undistorted volume levels. Not 
having to amplify bass that’s inaudible with your speakers is another way the 275 will run cooler.

Note:

 Autoformer-type passive volume controls are highly reactive loads that are known to cause 

amplifier malfunction. The 20 Hz or 40 Hz filter settings enable the 275 to drive them with ease.

Speaker Connections

There are separate speaker terminals for two pairs of speakers, labeled Speaker Pair A and 
Speaker Pair B.
Each - and + speaker terminal will accept bare speaker wire up to AWG 12, a wire terminated 
with a 

1

4

 spade lug, or with a single banana plug; dual banana plugs which are 

3

4

 (19mm) apart 

may be used for each speaker.

If you use bare wires, remove only enough insulation, about 

1

2

 (12mm) for each exposed bare 

wire to insert through the small hole in the side of the binding post. Before inserting a bare 
wire, twist the strands tightly between your fingers to prevent strays that might touch the chas-
sis or another terminal and cause a short circuit. If you have soldering experience you may want 
to “tin” the stripped bare wire with solder for a cleaner termination and to prevent the wire 
from oxidizing.

REAR PANEL CONNECTIONS AND CONTROLS continued

5

Manual

Audio Sens

Max Min

12V Trigger

Audio

Auto Turn On

12V

Ground

Lift Norm

In

Loop

     WARNING 

To Prevent Fire Or
Shock Hazard, Do
Not Expose This Unit
To Rain Or Moisture.

2250 Two Channel Amplifier

Parasound Products, Inc.

San Francisco, CA    U S A

Mono

Stereo

20Hz 40Hz

Flat

Bridging

High Pass Filter

Level

Input

Loop

R

Mono

L

R

L

Mono

THX

 Ref

THX

 Ref

Speaker Pair A

L

R

Mono

Speaker Pair B

L

R

Mono

Power Consumption: 800W

THX and Ultra2 are trademarks of THX Ltd.
which may be registered in some jurisdictions.
All right reserved.

4-8

Ohms

2-3 

Ohms

230V

50Hz

115V

60Hz

AC

Voltage

Load

Impedance

AC      115V/60Hz

AC      230V/50Hz

AC      115V/60Hz

AC      230V/50Hz

Speaker Pair A

L

R

Mono

Speaker Pair B

L

R

Mono

Summary of Contents for NewClassic Model 2250

Page 1: ...Model 2250 Two Channel Amplifier Model 2250 Two Channel Power Amplifier OWNER S GUIDE...

Page 2: ...will only fit into a grounding power outlet If you are unable to insert the plug into the outlet contact your electrician to replace your obsolete outlet Do not defeat the safety purpose of the ground...

Page 3: ...High Pass Filter Switch 4 Speaker Connections 5 Bridging Switch Stereo Mono 5 Mono Input 6 Speaker Connections 6 Load Impedance Switch 6 AutoTurn On 6 Sensitivity Adjust Knob 8 Ground Switch 8 Front P...

Page 4: ...u begin installation Unpacking Carefully unpack your Model 2250 and these accessories Detachable AC power cord Black trigger wire with a 2 5 mm sub mini plug at both ends Black trigger wire with a 2 5...

Page 5: ...kets of intense heat can still develop around any heat producing equipment Therefore a ventilation fan is high ly recommended Allow a few inches of empty space on each side and above the unit and try...

Page 6: ...ther THX certified components Note You may wish to experiment with different gain settings on your preamp or a non THX surround controller and on the Model 2250 to find a combination of gain settings...

Page 7: ...els Not having to amplify bass that s inaudible with your speakers is another way the 275 will run cooler Note Autoformer type passive volume controls are highly reactive loads that are known to cause...

Page 8: ...sum of the L and R channel outputs for stereo operation Mono Input and Speaker Connections 1 Turn the unit off and remove the AC cord 2 Connect the single cable from the preamp or controller to the R...

Page 9: ...et to its 12V position the Model 2250 is turned on and off with an external 9V to 12V voltage from your preamp or controller When the external volt age ceases the Model 2250 will turn off immediately...

Page 10: ...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...

Page 11: ...al fault or if the temperature is too high Protect Indicator Protect will illuminate red when the Model 2250 has experienced either an internal or external fault condition which has also activated its...

Page 12: ...illuminated Check for excessive temperature short circuited speaker wires low impedance speaker load and inadequate ventilation to remove heat Background Hum Move the Ground switch to Lift Move audio...

Page 13: ...Dealer or Parasound Authorized Reseller Units Will Be Refused by Parasound Under the Following Conditions 1 Unit was sent without the Parasound assigned RA number marked on the carton 2 Unit was sent...

Page 14: ...2V 15 mA Auto Turn On Audio 1 2 mV 12 V adjustable 15 minute turn off delay AC Power Requirement 110 120 V 220 240 V 50 60 Hz 3 watts standby 1000 watts full output Dimensions 171 4 Wide 16 Deep with...

Page 15: ...Notes CONNECTION AND SETUP NOTES 13...

Page 16: ...why Parasound has been a quality and value favorite of magazine reviewers sound professionals and listeners like you since we were founded in 1981 rev 0 91 2005 Parasound Products Inc Parasound Produ...

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