Audio Products

The Reference 80S stereo amplifier continues Audio Research’s latest design effort in creating a vacuum-tube amplifier that not only redefines ultimate music reproduction, but does it in an incredibly beautiful package.  Outwardly, the 80S shares the same dimensions as the 160M. A single shallow whisper fan is built into the bottom plate. Flexibility is built-in, too, with XLR an...[more]

Building on the successful introduction of the Centaur II stereo and mono amplifiers last year, and benefitting from the research and development used to create the Reference Series Hercules II amplifiers, this new amplifier satisfies the demand for a more powerful Performance Series amplifier. Products of the Constellation Audio “dream team,” the Centaur II 500 Stereo delivers outs...[more]

The Classic 2 is the most cost-effective way to experience the incomparable sound quality of Dan D'Agostino Master Audio Systems. Its core technologies are heavily based on the design of D'Agostino's acclaimed Momentum amplifiers. The sound combines the immense power and current needed to drive even the most exotic speakers with a subtle, sweet musicality normally associated with much smaller a...[more]

Classic 3 The Classic 3 brings the acclaimed sound of Dan D'Agostino Master Audio Systems amplifiers to home theaters and advanced 2.1-channel stereo systems. Borrowing heavily from the amplification circuits D'Agostino developed for the Momentum amplifiers, the three-channel Classic 3 is a perfect companion to the Classic 2 when outfitting a 5 or 7 channel configuration of main speakers i...[more]

Circuitry Highlights Patent pending Krell iBias Class A technology allows our latest amplifiers to run in full Class A mode to full power while minimizing heat generation. All signal gain is realized in the current domain using discrete, proprietary, multiple-output current mirrors with extraordinary open loop linearity. There are no generic integrated circuits or op amps used anywhere. Current...[more]

Circuitry Highlights Patent pending Krell iBias Class A technology allows our latest amplifiers to run in full Class A mode to full power while minimizing heat generation. All signal gain is realized in the current domain using discrete, proprietary, multiple-output current mirrors with extraordinary open loop linearity. There are no generic integrated circuits or op amps used anywhere. Current...[more]

The Stereo benefits from the same upgrades we made to the Mono. The power supply features substantially larger storage capacitors, to deliver cleaner DC power and more headroom on loud peaks. The pure copper bus bars used for the speaker outputs and power supply rails are twice the size of those in the original Hercules. Both of these improvements allow the Hercules II Stereo to perform even be...[more]

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Every major section of the amplifier - power supply, input, driver, and output stages - have all been enhanced in this advancement. A new transformer winding pattern provides over 50% more current output from the same transformer footprint. This additional current offers greater headroom during dynamic passages. A reinvisioned input stage combines a brand new circuit topology with advanced comp...[more]

DarTzeel true passion for music reproduction, which they have nurtured for 25 years, led us on a long quest to design an audio amplifier that can convey the emotions at the heart of a musical performance.Absolute sounds are proud to introduce the long-awaited result, the darTZeel NHB-108 model one stereo amplifier.Most consumer products today—even some very expensive audio components—are designed ...[more]

Abundant power is required for realistic sound quality and is a cornerstone of Dan D’Agostino Master Audio Systems’ amplifier design. The Progression Stereo continues this practice. A graceful anodized Aluminum chassis houses a 2,000 VA power supply transformer coupled to nearly 100,000 microfarads of power supply storage capacitance. Paired to this foundation is a fully complementa...[more]

Our Balanced Bridged topology uses only N-type output transistors, so the two halves of the audio signal are always perfectly balanced. In most fully balanced amplifiers, the schematics for the positive and negative halves of the amplifier circuit are mirrored, but one half uses N-type transistors and the other half uses P-type transistors. Thus, a perfectly balanced output can never be achieve...[more]

Constellation Audio, the renowned luxury goods manufacturer of high performance solid-state electronics, is pleased to announce the introduction of the new Revelation Series of components at CES 2017. CEO Dr. Murali Murugasu challenged his dream team of designers and engineers to develop a new series of Constellation Audio components that could deliver the essence of our renowned Performance Se...[more]

The Model 100.2 stereo power amplifier sets new standards in musicality and value against all other competitors at or near its price. Rated conservatively at 100 WPC into 8 ohms, the 100.2 produces 200 WPC into 4 ohms and a hefty 360 WPC into 2 ohms -- giving it sufficient drive to handle a wide variety of todayÂÂÂÂ’s leading loudspeakers. Both single-ended and bal...[more]

250 watts per channel into 8 ohms :With the current to deliver 500 watts into a 4-ohm load and 800 watts into a 2-ohm load, the Centaur has enough power to drive any speaker, even state-of-the-art full-range models. Balanced drive circuit design: Because the Centaur uses only N-type output transistors, it achieves essentially perfect positive/negative balance—something no amplifier that use...[more]

A two channel power amplifier in a slim line chasses. Combining the virtues of valve design with solid state circuit for high power stability and strong dynamics driving any speaker load with a clean undistorted signal.  Field effect transistors are used for both the input and driver stages. Like vacuum tubes they are voltage controlled and allow for circuitry design with a minimum of non-eve...[more]

Housed in a chassis the same size as the DSi200 integrated, the DS225 continues the design hallmarks of the DS450. Audio Research’s proprietary Class D all discrete analog switching mosfet output technology is again combined with a large, linear analog power supply, yielding tremendous speed and power delivery, but doing so with cool-running efficiency, idling at only 38 watts. The DS225 is ...[more]

The power supply is a classic linear, analog supply, heavily regulated and scaled up to provide explosive dynamics and impact. Its 1239 joules of energy storage are twice that found in the DSi200. Dynamic power is 900 watts into 8 ohms, 1800 into 4 ohms, and 2800 into 2 ohms, meaning the DS450 can control those big, tough-to-drive speaker systems. The output stage is a high-speed pulse-width modul...[more]

 Sophisticated and expensive to execute, surface mount circuitry is featured throughout gracing the design with short circuit path lengths, vanishing parasitic capacitance and improved bandwidth. Alone, the Evolution 2250e is ideal for use in stereo music systems. When coupled to the three channel Evolution 3250e, this duo makes ideal amplification for home theater applications.   PRO...[more]

FEATURES:Active Cascode Topology eliminates global negative feedback, only nested local feedback is employed around individual gain blocks. The result is an extraordinarily open, liquid, effortless sound. The signal path incorporates Krell Current Mode and CAST circuitry using proprietary multiple-output current mirrors in a complementary and balanced arrangement for extraordinary open loop linea...[more]

The FTC mandates that power ratings are quoted using a 1000 Hz sine wave into a fixed 8 Ohm resistor with final power specification stated at 1% distortion. Krell engineering considers this specification too lenient and not indicative of what an amplifier is required to provide. Krell designs to a much stricter standard. Our power tests use a 20-20,000Hz signal into 8, 4, and 2 Ohm loads. Our p...[more]

The Evolution Series culminates more than two decades of cutting edge audio design and includes stereo and home theater components that embody 26 years of Krell design and manufacturing excellence. When envisioning Evolution, Krell had a solitary goal - to handcraft a range of components that, simply put, were the best sounding products ever built. The result is a synthesis of almost impossible co...[more]

In this application, the Evolution 402e gets mated with the Evolution 707 Reference Surround Preamplifier/Processor and an Evolution 403e Three Channel Amplifier for ultimate home theater performance. Power Supply The Evolution 402e is equipped with two 2,200 VA transformers and 188,000 ÄĚĚĹžF of capacitance. This power source is the backbone for the output of t...[more]

The Full Power Balanced 200c Stereo Power Amplifier is designed for the audiophile who wants the ultimate sound quality from a stereo amplifier with power capabilities of 200 Watts per channel into 8 Ohm, 400 Watts per channel into 4 Ohm, and 800 Watts per channel into 2 Ohm loudspeaker loads. Highlights Fully balanced circuitry from input to output insures signal integrity, rejects noise, and...[more]

The Full Power Balanced 300c Stereo Power Amplifier is designed for the audiophile who wants the ultimate sound quality from a stereo amplifier with power capabilities of 300 Watts per channel into 8 Ohm, 600 Watts per channel into 4 Ohm, and 1200 Watts per channel into 2 Ohm loudspeaker loads. Highlights Fully balanced circuitry from input to output insures signal integrity, rejects noise, ...[more]

The Full Power Balanced X Series Stereo Amplifiers offer the greatest performance possible from a stereo amplifier. All X Series amplifiers share the same circuit topology, from the 300 Watt Full Power Balanced 300cx and the mid-level FPB 400cx at 400 Watts, to the awesome 700 Watt FPB 700cx, the most powerful stereo amplifier ever offered by Krell. While the amplifiers have much in common, there ...[more]

The Full Power Balanced X Series Stereo Amplifiers offer the greatest performance possible from a stereo amplifier. All X Series amplifiers share the same circuit topology, from the 300 Watt Full Power Balanced 300cx and the mid-level FPB 400cx at 400 Watts, to the awesome 700 Watt FPB 700cx, the most powerful stereo amplifier ever offered by Krell. While the amplifiers have much in common, there ...[more]

Highlights Fully balanced circuitry from input to output insures signal integrity, rejects noise, and improves signal-to-noise ratios to deliver a "night and day" sonic difference when compared to typical single-ended circuitry. Computer regulated power supply provides consistent sound quality at wide dynamic range regardless of fluctuating line voltages. Current mode operation ensures wide b...[more]

The Full Power Balanced X Series Stereo Amplifiers offer the greatest performance possible from a stereo amplifier. All X Series amplifiers share the same circuit topology, from the 300 Watt Full Power Balanced 300cx and the mid-level FPB 400cx at 400 Watts, to the awesome 700 Watt FPB 700cx, the most powerful stereo amplifier ever offered by Krell. While the amplifiers have much in common, there ...[more]

The elegant Krellcoat exterior hides the powerhouse that resides within this amplifier. Refined reproduction and overwhelming power defines the KAV-2250. Utilizing technology developed in the Krell Full Power Balanced amplifiers including oversized power supplies, Krell Current Mode circuitry, and balanced signal paths, this amplifier is ideal for use in stereo music and movie soundtrack reproduct...[more]

The Master Power 2+ combines circuitry derived from Dan D'Agostino's acclaimed Momentum amplifiers with advanced features that make it ideal for 2.1-channel music systems and advanced home theaters. The amplifier easily delivers 300 watts per channel into 8 ohms, but this can be increased to an astounding 1,000 watts by bridging the two channels. Switches on the back allow bussing of one signal...[more]

The Classic Stereo is the most cost-effective way to experience the incomparable sound quality of Dan D'Agostino Master Audio Systems. Its core technologies are heavily based on the design of D'Agostino's acclaimed Momentum amplifiers. The sound combines the immense power and current needed to drive even the most exotic speakers with a subtle, sweet musicality normally associated with much smal...[more]

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The amplifier technology that is winning acclaim from reviewers as “the best” is now available in a stereo amplifier—at less than one third the cost of the original. D’Agostino LLC today announced that it will begin shipping the new Momentum stereo amplifier in November 2011, at a suggested retail price of $25,000. The Momentum stereo amplifier carries the same uniqu...[more]

The S-275 is a slim line stereo power amplifier boasting our latest advancements in circuit design featuring an impressive 275 Watts per channel into 8 Ohms and 550 Watts per channel into 4 Ohms in stereo mode. Setting the rear panel switch to mono operation, the S-275 boasts a massive output of 550 Watts into 8 Ohms and 1,100 Watts into 4 Ohms. Technologies developed for the Krell Evolution am...[more]

Like the larger HD220, the new SD135 ("SD" for "Silicon Drive") uses Thermal TrakŽ self-biasing output devices in a Class A-B design. And like the HD220, it accommodates either single-ended or balanced inputs. But unlike the larger hybrid, the SD135 features an all-solid-state input stage using multiple JFET devices in each channel, directly driving the output stage – no interstage coupling capa...[more]