Parasound 2125 Correct Speaker Polarity is Important, Bridging Switch Stereo Mono, Mono Operation

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6REAR PANEL CONNECTIONS AND CONTROLS continued

Correct Speaker Polarity is Important

As you connect the speaker wires, you can see that the insulation on one of the two wires in each pair has either printing or a raised ridge. The marking lets you know which wire you con- nected to the positive speaker terminal at its other end.

Make sure the + wire you attach to each Model 2125 + speaker terminal is attached to the + terminal of the speaker for that channel.

Bridging Switch: Stereo - Mono

The Model 2125 power should always be turned off before moving this switch.

For normal operation the Bridging switch must be set to Stereo.

For bridged mono operation, set it to Mono.

Note: Stereo sound will be faint and very distorted if you accidentally leave the Bridging switch in its Mono position.

High Pass Filter

Flat 20Hz 40Hz

Stereo Mono

Bridging

Mono Operation

We recommend an 8 ohm minimum speaker load for bridged mono opera- tion. For mono the Model 2125 “bridges” the R channel to amplify only the positive half of the audio signal and the L channel to amplify only the nega- tive half of the audio signal. In effect, each channel “sees” only half of the speaker’s rated impedance, so that an 8 ohm speaker in bridged mono is only a 4 ohm load and a 4 ohm speaker in mono is only a 2 ohm load. This is why the mono power output is much higher than the 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 channel Input jack.

3.Set the Bridging switch to its Mono position.

4.Connect the positive lead of the speaker wire to the red R + channel speaker pair A terminal.

5.Connect the negative lead of the speaker wire to the red L + channel speaker pair A terminal.

6.Do not connect anything to either the L - or R - speaker terminals.

7.If you have a second mono speaker repeat steps 4 - 6 with the speaker pair B terminals

8.Reconnect the AC cord.

Note: The Model 2125 creates more heat when it drives a bridged mono speaker or multiple speaker pairs. Lower impedance speakers will make it run even hotter. Heat greatly reduces the life of the amplifier and nearby components. Please heed the instructions for setting the Load Impedance switch to avoid overheating.

Load Impedance Switch

LoadAC

ImpedanceVoltage

2-3

4-8

115V

230V

Ohms

Ohms

60Hz

50Hz

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Contents Model Important Safety Instructions Table of Contents Introduction Unpacking115v 230v AC Voltage Selector Switch Installation and Ventilation RequirementsConnection Precautions Rear Panel Connections and ControlsJacks Loop JacksHigh Pass Filter Switch Speaker ConnectionsBridging Switch Stereo Mono Load Impedance SwitchCorrect Speaker Polarity is Important Mono OperationAuto Turn On Switch Automatic Turn On and OffGround Switch AC Power Connections and AC GroundingFront Panel Buttons and Display Maintaining Your Model Problems and RemediesTroubleshooting Before You Return Any Unit to Parasound for Service If YOU Require AssistanceParasound Model 2125 Specifications Connection and Setup Notes Rev

2125 specifications

The Parasound 2125 is a high-performance power amplifier that has carved out a niche for itself among audiophiles and home theater enthusiasts. Renowned for its impressive sound quality and robust design, it serves as a reliable option for those seeking to drive their loudspeakers with precision and power.

One of the standout features of the Parasound 2125 is its high current capability, which ensures that the amplifier can deliver ample power even to low-impedance speakers. With a power output of 125 watts per channel into 8 ohms and 220 watts per channel into 4 ohms, it provides headroom for dynamic peaks in music and movie soundtracks. This makes the 2125 an excellent choice for a wide variety of speaker types and listening environments.

The design of the Parasound 2125 is characterized by its Class AB operation, which combines the efficiency of Class A and the power of Class B. This results in an amplifier that can reproduce audio with minimal distortion and noise, thus enhancing the listening experience. The unit features a toroidal transformer, known for its low electromagnetic interference and high efficiency, contributing to the 2125's clean and detailed sound signature.

In addition to its powerful output, the Parasound 2125 comes equipped with a range of advanced technologies. For example, its multi-layered, aluminum chassis not only adds to its aesthetic appeal but also reduces unwanted resonance and vibration, further preserving audio fidelity. The amplifier features a comprehensive protection circuit that safeguards against overheating and short circuits, ensuring longevity and reliability.

The 2125 also includes flexible connectivity options, with both balanced XLR and unbalanced RCA inputs, allowing users to tailor their audio setup according to their preferences. The amplifier's rear panel includes gold-plated binding posts that facilitate secure and efficient speaker connections.

Overall, the Parasound 2125 stands out as a formidable power amplifier that boasts impressive specifications and features designed to appeal to discerning listeners. Its combination of powerful output, sophisticated design, and high-quality components make it an ideal solution for those looking to enhance their audio systems, whether for music playback or home theater applications. With the Parasound 2125, users can expect an immersive listening experience that brings their favorite sounds to life.
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