The center line, labeled, “%,” presents the same information as above, but displayed as a percentage. Therefore, a 120 volt input should read 100%.

The bottom line, labeled “Energy Storage,” indicates the accepted voltage range to achieve normal operation.

During loud passages, or if your AC line temporarily sags, you may witness some degree of fluctuation in the meter. If the needle consistently resides somewhere outside the accepted Energy Storage range, you may elect to have an electrician check your line voltage to ensure proper operation of the Classic 250.

As discussed in the Front Panel: Power section, a yellow meter indicates standby and a solid blue meter indicates full op- eration. If the amplifier experiences a problem, for example a short circuit or over-voltage, the C250 will go into its fault protect mode. This status is indicated by the meter display flashing blue. If you ever encounter this situation with your C250, first check to make sure that all con- nections are seated properly. Then turn off and unplug the C250 from the wall, allow- ing its circuitry to reset and power it back up. If the amplifier is still indicating the fault mode, please refer to the back of this manual for service.

Back Panel: Inputs

There are two sets of inputs to choose from, single-ended (RCA) and balanced (XLR).

The single-ended RCA connections are a very high quality, gold plated connec- tor designed specifically for PS Audio components. The balanced XLR con- nector is easily identifiable as the larger connector with three individual pins. The C250 is a fully balanced design, thus use of the balanced XLR inputs is the optimal choice.

Stereo Input: Whether you are using a pre-amplifier or a source component with a built in processor, you will want to ensure that the left output from that equipment matches the “Left” of the C250 and like- wise for the “Right.” Be sure to use the inputs in matched pairs for example, use both RCA inputs or both XLR inputs, but never one of each.

Mono Input: If you intend to use your C250 in mono mode, which will require one Classic 250 amplifier per speaker, you must first switch the input selector on the right channel to Mono. This deactivates the right channel input. The left channel connectors are now used for making input connections while in mono. These instruc- tions are also indicated on the back panel in red text.

Back Panel: Outputs

There are four pairs of speaker terminals on the back of the C250. Two pairs are situated on the left channel side and two pairs are situated on the right channel side. There are two pairs of outputs per channel for easier bi-wire connections to your loudspeakers. Both pairs output the exact same signal for their respective channels, right or left.

The C250 uses WBT five-way binding posts able to accept a spade, banana, spade and banana, pin or straight wire.

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PS Audio C250 quick start Back Panel Inputs, Back Panel Outputs
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C250 specifications

The PS Audio C250 is a high-end audio preamplifier designed to elevate the listening experience for audiophiles and music enthusiasts alike. As part of PS Audio's commitment to quality sound reproduction, the C250 integrates innovative technologies and high-performance components to deliver exceptional audio fidelity.

One of the standout features of the C250 is its fully balanced circuitry. This design minimizes noise and distortion, enhancing the clarity and detail of the audio signal. The balanced configuration allows for longer cable runs without loss of quality, making the C250 ideal for complex audio setups. Additionally, it supports both single-ended and balanced inputs, accommodating a wide range of source components.

The C250 boasts an advanced digital-to-analog converter (DAC) that supports high-resolution audio formats, including DSD and PCM. This allows listeners to enjoy their digital music collections in exquisite detail. With multiple digital inputs, including USB, coaxial, and optical, users can connect their favorite digital sources effortlessly. Furthermore, the DAC employs proprietary filtering technology, ensuring a smooth and natural sound signature free from harshness.

Another notable feature of the C250 is its comprehensive volume control system. Using a sophisticated analog volume circuitry, it maintains resolution across the entire volume range, preserving dynamic range and tonal accuracy without introducing unwanted artifacts. The preamp also includes a high-quality headphone amplifier, providing audiophile-quality sound through headphones for private listening sessions.

Additionally, the C250 offers a user-friendly interface with a large, easy-to-read display. The remote control allows for seamless adjustments from a distance, making it convenient to operate. The unit's robust build quality, featuring a heavy chassis and premium components, contributes to its overall performance and durability.

With versatile connectivity options, including multiple line-level inputs and outputs, as well as home theater bypass capability, the C250 is designed to fit effortlessly into any audio system. The unit's combination of cutting-edge technology, premium parts, and meticulous engineering make it a standout choice for those seeking a high-performance preamplifier that delivers immaculate sound reproduction.

In summary, the PS Audio C250 is an exceptional audio component that brings together advanced features, superior technologies, and high-quality craftsmanship. Whether you're an avid vinyl collector or a digital music lover, the C250 promises to enhance your listening experience with stunning clarity and depth.
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