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12 Volt Input Jacks 

The Model 2125 v.2 12V input uses a 3.5mm jack (mono).  To use the 12V trigger, insert the trigger 
wire plug into this jack and the plug at the wire’s other end into the AV receiver or preamp’s 12V output 
jack.  We have included a 3.5mm to 3.5mm trigger wire as well as a 3.5mm to 2.5mm trigger wire. 

 

Note:

 If 

the controller’s trigger output is a + and – terminal, you can cut the 3.5mm plug off one 

end of the included trigger wire and attach the bare wires to these terminals.  The trigger plug tip is 
+ (positive) and its sleeve 

– (negative). 

 
 

12V Loop Out Jack 

The Trigger Out jack lets you loop 

or ―daisy-chain‖ the incoming trigger voltage to an additional Model 

2125 v.2 or another component(s). 

 
 

Triggering multiple devices

  

The total load on your preamp

’s trigger output(s) is the sum of the trigger current drawn by each of the 

components you’ve looped together. The Model 2125 v.2 trigger circuit draws a negligible 15 mA. 
Check the maximum capacity of your AV receiver, processor 

or home controller’s trigger outputs so 

you do not overload them by connecting too many power amplifiers. Typical ratings are 50mA to 
100mA. 
 

3.5mm and 2.5mm trigger jacks 

Some other Parasound power amplifiers and preamplifiers might have 

2.5mm ―sub-mini‖ trigger jacks.  

To use the Model 2125 v.2 with products that use a 2.5mm jack we have included a trigger wire with a 
3.5mm plug at one end and a 2.5mm plug at the other end. 

 

 

 

AC Power Cord 

 

Model 2125 v.2 is supplied with a high quality IEC standard AC cord.  Please connect it directly to an 
AC wall outlet or power conditioner that is always ―live.‖  If possible, plug your Model 2125 v.2 into the 
same AC outlet that your preamplifier is plugged into.  If different AC outlets are used for the Model 2125 
v.2 and the preamplifier the ground potential between the two outlets might be higher or lower, resulting 
in audible hum.   

 
 

 

 

 

 

 

 

Summary of Contents for 2125 v.2

Page 1: ...Model 2125 v 2 Two Channel Amplifier OWNER S GUIDE...

Page 2: ...This plug 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...

Page 3: ...lines 5 Rack Mounting 5 AC Mains Voltage 6 Rear Panel Connections and Controls 6 Bridged Mono Operation 8 A B Speaker Load Switch 9 Turn On Options 10 Front Panel Operation 12 Problems and Remedies 13...

Page 4: ...an extra copy of your original purchase receipt bill of sale and store it inside the Model 2125 v 2 s carton Parasound Model 2125 v 2 Amplifier Serial ______________ 5 digit number below the bar code...

Page 5: ...cords Where signal cables must cross AC cords they should do so only at a 90 right angle Ventilation Requirements Always position the Model 2125 v 2 horizontally The Model 2125 v 2 should never be st...

Page 6: ...ur Model 2125 v 2 before making or changing any input output or trigger wire connections Inserting or removing an input or output cable while the Model 2125 v 2 is turned on can result in a blast of s...

Page 7: ...re information please see the section on Bridged Mono Operation in this manual Note The Model 2125 v 2 power should always be turned off before moving this switch Note If two speakers are attached for...

Page 8: ...of the audio signal and its L channel to amplify only the negative half of the audio signal In effect each channel sees only half of the speaker s rated impedance so that a single 8 ohm speaker is ac...

Page 9: ...drivers Since both channels of the amp need the same audio signal you will need to connect the Loop Out jack of one channel to the input of the second If you connected your preamp to the 2125 v 2 s L...

Page 10: ...and settings should be made before connecting its AC cord Quieter This is the more sensitive setting and the amp will turn on automatically with a very low level audio signal corresponding to about 1m...

Page 11: ...f the components you ve looped together The Model 2125 v 2 trigger circuit draws a negligible 15 mA Check the maximum capacity of your AV receiver processor or home controller s trigger outputs so you...

Page 12: ...nd the setting of the Speaker Load switch or lower the volume level To reset the protection circuit you need to turn the unit off If the amp is being turned on by a 12V trigger or audio sensing trigge...

Page 13: ...Check that input cables and speaker wires are secure at both ends turn amp off first Make sure the preamp is switched to the correct input Is the Protect light illuminated Check for excessive temperat...

Page 14: ...sound Under the Following Conditions 1 Unit was sent without the Parasound assigned RA number marked on the carton 2 Unit was sent in an unsuitable shipping carton and packing inserts and is likely to...

Page 15: ...22 Specifications Power Output RMS power 20 Hz 20 kHz All Channels Driven 150 watts x 2 8 225 watts x 2 4 225 watts x 2 2 Load switch set to 2 3 Bridged Mono 400 watts x 1 8 400 watts x 1 4 Load switc...

Page 16: ...16 Parasound Products Inc 2250 McKinnon Ave San Francisco CA 94124 415 397 7100 Fax 415 397 0144 www parasound com...

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