mono power amplifier
stereo power amplifier
The Thesis α (alpha) preamplifier sports two analogue and four digital inputs including S/PDIF, TOSLINK, BNC and USB. All inputs, as well as volume setting with muting function are remote-controllable via an RC handset. A twin RC-coupled output stage caters for driving long cables and connecting even two sets of power amplifiers to drive speakers in bi-amp configuration. The analogue section of the thesis α can be fed by the Thesis π twin PSU which can also supply the φ phono stage with power simultaneously.
The analogue circuit of the Thesis α is a new design from scratch, while the digital section based around our Dactil 2.1 DAC and USB 2.0 modules (by using card slots both modules are upgradeable in the future) is an enhancement of our exceptional Obelisk DA digital-to-analogue converter – „one of the finest USB DACs I have had the pleasure to audition, probably at any price”, attested the renowned journalist Malcolm Steward in Hifi-Choice and Top Audio Gear. And this worldclass performance is surpassed by the Thesis α!
The Thesis λ (lambda) is a preamplifier for the analogue-blooded fans. You can choose between five of your analogue sources and adjust the volume with an RC handset, but that is all you can get from the digital world by this clean-cut preamp. On the analogue side, however, it is the most refined preamplifier ever built by Heed.
The amplifier circuit of the Thesis λ is the pure version of the Thesis α’s analogue section. With the lack of digital circuitry, there is no reason to compromise anything. Aiming for the best possible sound quality, the Thesis λ offers an unexceptional PCB design, unique to our Thesis line preamplifiers.
In a standalone mode, it is a very robust and capable device with its sturdy internal power supply. There is, however, an option to upgrade this remarkable performance to an even more astonishing level. The Thesis π external power supply adds more clarity, more accuracy and a great bunch of smoothness to the presentation.
The Thesis φ (phi) is a no-compromise phono preamplifier for all vinyl connoisseurs using a top-class turntable. Just like the α or λ preamps, it is also fed by the Thesis π twin PSU. By using two independent – MM (moving magnet) and MC (moving coil) – amplifier circuits, it is possible to use two record players connected simultaneously. Cartridge matching is highly customisable for gain and impedance on the rear panel of the unit by jumpers. Noise characteristics, dynamic range, headroom and frequency response of the Thesis φ are second to none.
The thesis ω (omega) monobloc power amplifier is an RC-coupled device in true Heed fashion that drives loudspeakers in a similar way to valve power amplifiers, but without their inherent problems related to the vacuum tube. Despite certain topological similarities to its valve counterparts, the Thesis ω is best described as a quintessentially solid-state power amp that successfully gets around the often sterile, lifeless sound of most solid-state devices. We believe that connecting amplifiers to speakers by RC- instead of the prevalent DC-coupling results in a much more natural, less “cropped” decay of tones. Freed from all containments, we could achieve a no-compromise implementation of the Transcap topology in the Thesis ω.
With its very generously sized power supply, unlike valve amplifiers, it is also extremely stable even into the most difficult loads – continuous power delivery up to 160W or capability of driving loads down to 1.6 Ohm speak for themselves. It is capable of driving all kind of sensible speakers.
In short, the thesis ω power amplifier epitomises an almost alchemical synergy of solid-state stability and the finesse and “live” magic usually achieved only by 300B triodes in valve amplification.
The Thesis γ (gamma) stereo power amplifier is the most athletic member of the family. With great effort, we have succeeded to squeeze two Thesis-class Transcap module into one rather tiny, but chunky metal chassis. Its wall-to-wall transistor array supplies tremendous energy for two channels of music, without the slightest feeling of necessity.
For being a Transcap-technology stereo power amplifier, the Thesis γ has an extermely good overall transient response. The percussion instruments sound vividly and life-like, providing the essential base of music. While all other instruments and vocals brillare in their place, together they create a concert-like atmosphere, where you can feel the wink of the musicans when they make an upbeat of a new measure.
The Thesis π (pi) twin power supply can feed the α or λ preamplifiers and the φ phono stage simultaneously. It has two independent sections, each with dual regulated power supply rails. In order to ensure an absolutely clean and stable power delivery, the Thesis π uses high-grade components custom made to our specifications, all massively overspecified for smooth and effortless performance even when pushed to its limits.
It is not only the extension of the spectrum, but the smoother, cleaner and more articulated performance makes the π power supply a great upgrade for the thesis preamplifiers. Though the α and λ are both very well equipped to make a great impression in standalone mode, the addition of the π makes the icing on the cake in a thesis system.
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