Parasound 2125 V.2 manual Bridged Mono Operation, Speaker Terminals

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Speaker Connections

Speaker Terminals

There are separate speaker terminals for two pairs of speakers, labeled Speaker Pair A and Speaker Pair B. The speaker terminals accept speaker wires with banana plugs, spade connectors or bare wire.

Correct Speaker Polarity is Important

Polarity refers to + and – connections. Speaker wires are coded with color, printing or a ridge on the insulation on one of the leads so you know which lead was connected to the + and – terminals at the other end. This coding will help you keep the + and - polarity consistent for all channels. If some of the speakers are wired with incorrect polarity you will significantly affect sound quality.

Speaker Wire Length and Gauge (thickness)

When selecting speaker wire, follow these guidelines:

•Keep the length of your speaker wire as short as possible.

•Use the thickest wire practical. For lengths greater than 50 feet, use speaker wire with an AWG (gauge) of 14 or lower. The smaller the AWG number, the thicker the wire.

•Do not use speaker wire that is thinner than 16 AWG.

•Keep wire lengths for both channels as close to equal as possible.

Bridged Mono Operation

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.

Careful attention must be paid to the total impedance of all speakers wired to the unit when it is set for bridged mono operation. When set to mono the Model 2125 v.2 uses its R channel to amplify only the positive half 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 actually a 4 ohm load when the amp is bridged to mono. A 4 ohm speaker is a 2 ohm load in bridged mono. This is why bridged mono power output can be much higher than the sum of the L and R channel outputs for stereo operation. When the Speaker Load switch is set to the 4-8Ω position the speaker impedance must be 8 ohms for bridged mono operation. This switch must be set to its 2-3Ω position if the speaker impedance is less than 8 ohms.

Setting Up the Model 2125 v.2 for Bridged Mono Operation:

1.Turn the unit off and remove the AC cord.

2.Connect the single RCA cable from the preamp or audio controller to the R channel Input jack.

3.Set the Bridged Mono switch to the Bridged (Mono) position.

4.Set the Speaker Load switch to the correct position (see instructions on next page).

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

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

7.Do not connect the L- and R- speaker terminals.

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

9.Reconnect the AC cord.

Note: Stereo sound will be faint and distorted if you accidentally leave the Bridging switch in its Mono position and a stereo pair of speakers are attached.

Note: The Model 2125 v.2 will create more heat when it drives a bridged mono speaker or multiple speaker pairs. Lower impedance speakers will make it run even hotter. Heat buildup greatly reduces the life of the amplifier and nearby components. Please pay attention to the instructions for setting the Speaker Load switch to avoid overheating.

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Contents Model 2125 Important Safety Instructions Table of Contents Parasound Staff Keeping Records for Future Reference Important Warranty informationThank You for Choosing Parasound Ventilation Requirements Placement GuidelinesUnpacking Your Model 2125 AC Mains Voltage Rear Panel Connections and ControlsFront Panel Speaker Selector Lockout Switch Bridged Mono SwitchHigh Pass Filter Switch Right and L Left Level KnobsSpeaker Wire Length and Gauge thickness Setting Up the Model 2125 v.2 for Bridged Mono OperationBridged Mono Operation Speaker TerminalsTwo 8 Ohm Speakers Single 8 Ohm SpeakerSingle 4 or 6 Ohm Speaker Turn On Options Switch Manual PositionAudio Position Automatic on/off 12V Position Automatic on/off5mm and 2.5mm trigger jacks Volt Input Jacks12V Loop Out Jack Front Panel Operation Problems and Remedies Amp is Overheating or the Hi-Temp Indicator is IlluminatedUnit Will Not Turn On No Sound From the Speakers but amp turns onRepair or Service Are You Having Difficulty?Specifications 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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