Parasound 2125 V.2 Right and L Left Level Knobs, Front Panel Speaker Selector Lockout Switch

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R (Right) and L (Left) Level Knobs

To increase the listening level for each channel, turn its Level knob clockwise. To decrease the listening level turn it counter-clockwise. The 2125 has a total gain of 28 dB 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.

Note: You may wish to experiment with different gain settings on your preamp or surround controller and on the Model 2125 v.2 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.

Front Panel Speaker Selector Lockout Switch

When this switch is set to Normal, the front panel A and B buttons determine whether speaker output terminals A and B are live. When this switch is set to Lockout, the front panel A and B buttons are disabled and speakers A and B will always be on. This can be particularly useful for a professional audio installer who never intends for the client to use the front panel buttons.

Bridged Mono Switch

Bridged operation configures the Left and Right channels to function as a single higher powered amplifier channel to drive a single speaker. This is how two Model 2125 v.2 amps are used as monoblocks to power a pair of speakers. It’s also effective for powering a single passive subwoofer. Please note that in bridged mono operation the minimum speaker impedance is 8 Ohms (if the load switch is set to 4-8Ω). With the Speaker Load switch set to the 2-3Ω position it is possible to drive two 8Ω speakers or a single 4Ω speaker. For more 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 normal stereo operation the sound will be faint and very distorted if you accidentally leave the Bridged Mono switch in its Mono position.

High Pass Filter Switch

The High Pass Filter can improve the sound in many installations. It’s called a ―high pass‖ filter because depending on the switch position it permits signals higher than 20 Hz or 40 Hz to pass, while preventing signals below these frequencies from passing.

•The Flat setting of this switch disconnects the filter and the 2125 v.2’s frequency response is full range (flat).

•The 20 Hz setting filters out frequencies below 20 Hz at 18 dB per octave. Your speakers have greater dynamic range and far less distortion when they don’t receive frequencies which are lower than they are capable of reproducing. The 2125 v.2 operates more efficiently when it’s not called upon to amplify very low frequencies so you’ll have more power in the range the speaker is capable of reproducing. Because the 20 Hz filter also has a steep 18 dB per octave slope, it is essentially a sub-sonic filter, and you probably won’t notice any loss of low 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 2125 v.2 is driving in-wall or in-ceiling speakers because most of them have little useful bass output 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 2125 v.2 will run cooler.

Note: Most wall mounted speaker volume controls use stepped autoformers whose highly reactive loads occasionally cause amplifier distress and malfunction. The 20 Hz or 40 Hz filter settings enable the 2125 v.2 to drive them with ease.

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Contents Model 2125 Important Safety Instructions Table of Contents Thank You for Choosing Parasound Important Warranty informationParasound Staff Keeping Records for Future Reference Unpacking Your Model 2125 Placement GuidelinesVentilation Requirements Rear Panel Connections and Controls AC Mains VoltageRight and L Left Level Knobs Front Panel Speaker Selector Lockout SwitchBridged Mono Switch High Pass Filter SwitchSpeaker Terminals Speaker Wire Length and Gauge thicknessSetting Up the Model 2125 v.2 for Bridged Mono Operation Bridged Mono OperationSingle 4 or 6 Ohm Speaker Single 8 Ohm SpeakerTwo 8 Ohm Speakers 12V Position Automatic on/off Turn On Options SwitchManual Position Audio Position Automatic on/off12V Loop Out Jack Volt Input Jacks5mm and 2.5mm trigger jacks Front Panel Operation No Sound From the Speakers but amp turns on Problems and RemediesAmp is Overheating or the Hi-Temp Indicator is Illuminated Unit Will Not Turn OnAre You Having Difficulty? Repair or ServiceSpecifications Parasound Products, Inc McKinnon Ave, San Francisco, CA

2125 V.2 specifications

The Parasound 2125 V.2 amplifier stands out as a premier choice for audiophiles seeking high-quality sound reproduction combined with solid build quality. It is well-regarded for its ability to deliver powerful, clear audio while maintaining the signature warmth that is often associated with high-end audio equipment. With a sleek design and robust features, the 2125 V.2 is an excellent addition to any home theater or audio system.

One of the primary features of the Parasound 2125 V.2 is its high-power output. The amplifier is capable of delivering 125 watts per channel into 8 ohms and 185 watts into 4 ohms, allowing it to drive a wide range of speakers with ease. This power output supports dynamic sound reproduction, crucial for producing the subtleties in both music and movie audio tracks.

The amplifier employs a linear power supply with a toroidal transformer, which is known for its efficiency and low noise. This design choice enhances the overall performance by reducing electromagnetic interference and ensuring a clean power delivery to the amplification stages. The use of high-quality components throughout the amplifier, such as durable capacitors and low-noise transistors, further contributes to its reliability and auditory fidelity.

In terms of technology, the Parasound 2125 V.2 incorporates a class AB amplifier topology. This hybrid design offers the benefits of both class A and class B amplifiers, delivering robust performance with minimal distortion. This results in a smooth, warm sound signature that is pleasing for extended listening sessions. The amplifier also features a low-frequency filter for optimized performance when used in home theater setups, allowing it to handle various audio formats without compromising on quality.

Additionally, the Parasound 2125 V.2 is equipped with a variety of connections, including balanced XLR inputs as well as unbalanced RCA inputs. This flexibility makes it easy to integrate the amplifier into different audio systems while ensuring compatibility with a wide range of equipment. For added versatility, the amplifier includes a trigger input, enabling remote operation when paired with compatible devices.

The build quality of the 2125 V.2 is another standout characteristic. Housed in a rigid metal chassis, the amplifier not only looks elegant but also protects its sensitive internal components. The front panel features a straightforward design with easy access to volume control and indicator lights that provide real-time feedback on the amplifier’s status.

In conclusion, the Parasound 2125 V.2 amplifier offers a potent blend of power, sound quality, and flexibility, making it an excellent choice for music lovers and cinephiles alike. Its well-thought-out design and engineering reflect Parasound's commitment to delivering exceptional audio equipment that can satisfy even the most discerning listeners.
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