Rotary

The rotary knob on the front panel does not directly control the volume. Instead, it controls circuitry that does so with greater ﬁdelity and precision than traditional volume potentiometers could ever achieve.

Since the volume control circuitry is under software control, it is possible to customize its behavior under various conditions. To better understand why this is so valuable, consider two scenarios:

Person A places a high value on precision in achieving exactly the volume setting that makes the music most realistic; being able to easily change volume setting by a fraction of a decibel is critical to his enjoyment of the system.

Person B just wants to jump easily from low volumes to a reasonable listening level, and is less concerned with the ﬁner points of precision than with getting what he wants with a quick twist of the knob.

You can see the problem in these scenarios: Person A wants extremely ﬁne gradations on the volume control, which will require many rotations to go from extremely low setting to normal listening levels; Person B wants to get from one to the other with a “quick twist” of the knob, requiring coarse gradations in order to cover so much range in so little space. What happens when Persons A and B live in the same house? Or if Person C wants to have both, depending on their mood at the moment? (In fact, most of us are probably like Person C.)

Classé solves this dilemma by altering the response of the volume control, based on several factors.

Since it is rare to listen at extremely low (barely audible) volumes, the low range adjustment of the volume control allows for faster response to knob input when the volume setting values are low. When activated, you will get from extremely low to middle volume control settings a bit faster than you would otherwise.

This effect can be subtle, and may not even be desirable when the speakers used have extremely high sensitivity (since this results in using the lowest part of the range more than you would otherwise).

The most signiﬁcant factor in the perceived responsiveness of the volume control is the speed at which the knob is being turned. We all naturally tend to move volume knobs more quickly when we need to make a bigger change, and we tend to slow down as we approach our desired volume. Thus, if the CP-500 sees the knob moving relatively quickly, it uses coarse steps to effectively accelerate the action of the circuitry. As the knob begins to turn more slowly, the CP-500 will actually increase the resolution of the steps, which slows down the action of the volume control and yields greater precision in choosing an appropriate setting.

CP-500 specifications

The Classe Audio CP-500 is a high-performance stereo preamplifier that has become a staple in the audiophile community due to its impressive sound quality and innovative design. This preamp is crafted with meticulous attention to detail, aimed at delivering pure audio fidelity and an immersive listening experience.

One of the standout features of the CP-500 is its lightweight yet robust chassis, which is designed to minimize resonance and interference, ensuring that the signal path remains clean. The unit incorporates a sophisticated custom power supply that provides stable and reliable energy, reducing noise and enhancing overall performance.

At the heart of the CP-500's design is its high-quality analog signal path. The preamplifier uses high-grade components, including premium capacitors and resistors, to retain the integrity of the audio signal. This design philosophy is reflected in the preamp's exceptional frequency response and low total harmonic distortion (THD), making it a superb choice for discerning listeners who demand the best from their audio systems.

The CP-500 also features balanced and unbalanced inputs and outputs, providing flexibility for various system configurations. The inclusion of both XLR and RCA connectivity allows users to seamlessly integrate the preamp into their setups, whether they use studio-grade equipment or home audio devices. Additionally, it supports multiple source inputs, making it versatile for any audio collection.

Another notable characteristic is the preamp's intuitive user interface. The front panel includes a clear display and ergonomically placed controls, making it easy to navigate through various settings and source choices. The remote control adds convenience, allowing users to adjust volume levels and switch inputs from anywhere in the listening environment.

Classe Audio places a strong emphasis on compatibility, particularly with their amplifiers, ensuring that the CP-500 works harmoniously with their line of high-performance power amplifiers. This synergy allows for an optimal audio experience, highlighting the capabilities of both the preamp and amplifier, resulting in sound that is both dynamic and nuanced.

In conclusion, the Classe Audio CP-500 preamplifier is a prime example of high-fidelity audio engineering. Its combination of superior build quality, advanced technology, and elegant design makes it an excellent choice for audiophiles seeking to elevate their sound systems. Whether used for critical listening or simply enjoying music, the CP-500 delivers an exquisite sonic experience that stands the test of time.