Krell Industries KPA, KBL guide

These units are the current state-of-the-art. No compromisewas allowed in their design. Details concerning their technical performance are covered in more detail below, A second important consideration was to introduce

the programmable concept employed in our current KSA/KMAamplifier line into our preamplifier line. A single KBLand KPAare used for stereo operation. A second unit of either can be added to achieve dual-mono, fully balanced operation. They can be easily changed without being returned to the factory. There are many advantages to dual-mono operation. The capability of the KBLand KPAto operate in either modeallows you to plan the development of your system over time, without the waste of moneyand time associated with trading or selling used gear. It also allows you to optimize your system more closely to your needs. For example, if line sources are most important, you can purchase two KBLs', with or without a KPA. If phono is most important you can purchase two KPA's and one KBLcreating a completely balanced path for the phono signal. The ultimate configuration, of course, is two KBLand two KPA.This creates a completely dual-mono, balanced preamplifier system for all inputs and outputs. Other details concerning the functions of the units are covered below and in the Installation and Operation sections.

The method used to switch a KBLor KPAfrom stereo to dual-mono operation is unique. For stereo operation each chassis has complete circuit paths for the left and right channels. When switched to dual-mono, balanced operation the left channel circuitry is assigned to the non-inverted path and the right channel circuitry is assigned to the inverted path. This changes the rear panel connector assignments on both the KBLand KPA. See the sections on Installation and Operation below for more details.

The KBLand KPAuse high-bias, pure Class A circuits throughout, including the power supplies and regulators. Circuits are DCcoupled, meaning there are no capacitors in the signal path. The power supply system and output circuits are extremely high-power when compared with conventional preamplifier designs. The output section of the KBL, for example, is really a small power amplifier, capable of swinging 60 volts peak-to-peak. This allows the KBLto maintain exceptional linearity under all conditions and drive virtually any length of cable without signal degradation. The external supply has two stages of regulation. Within each preamp chassis there are independent tracking regulators for each section of circuitry, separated channel-to-channel.

The KPAhas completely passive RIAAequalization. Maximumdeviation from the standard is +/- .1 dB from 10Hz to 20KHz. All parts are 1% tolerance.

KBL, KPA specifications

Krell Industries, a name synonymous with high-fidelity audio, has made significant strides in the high-end audio equipment market with its KPA and KBL models. These amplifiers epitomize Krell's commitment to exceptional sound quality, advanced technologies, and innovative design, catering to audiophiles who seek unparalleled listening experiences.

The Krell KPA, a cutting-edge power amplifier, showcases Krell’s renowned high-performance design. One of its standout features is the use of an ultra-linear, class-A amplification topology. This design principle not only enhances audio fidelity but also ensures lower distortion levels, allowing music to be reproduced with incredible detail and clarity. The KPA is also engineered to deliver substantial power output, with sufficient reserves to drive even the most demanding speaker loads, making it an ideal choice for dynamic music genres.

Another noteworthy aspect of the KPA is its sophisticated thermal management system. The use of oversized heatsinks and intelligent fan control keeps the amplifier cool during extended listening sessions, thereby preserving performance and longevity. The KPA also includes advanced connectivity options, including RCA and XLR inputs, which cater to a variety of system configurations, ensuring versatility in integration with other high-end audio components.

Conversely, the Krell KBL, a preamplifier model, is designed to complement the power capabilities of the KPA. The KBL's main features include a fully balanced design and multiple gain stages that contribute to its exceptional signal-to-noise ratio. This ensures that the audio signal remains pristine, free from interference and distortion, resulting in a true-to-life reproduction of recordings. The preamplifier also offers an impressive array of inputs, including analog and digital options, allowing users flexibility in their source selection.

Both the KPA and KBL incorporate Krell's proprietary technologies, such as the Cast™ technology, which facilitates a three-dimensional soundstage and unrivaled musical character. This technology seamlessly enhances the relationship between components, creating a cohesive sound that many audiophiles strive for. Furthermore, the build quality of both models is exceptional, with premium materials and craftsmanship that reflect Krell's dedication to performance and aesthetics.

In summary, Krell Industries' KPA and KBL models combine innovative technologies, remarkable power, and unmatched audio quality, making them ideal choices for serious music lovers. Their features, performance, and elegant design showcase Krell's unwavering commitment to the pursuit of audio excellence, setting new standards in the high-end audio luxury market.