Heed Thesis

From Heed Audio the thesis range of electronics makes its London debut at The Indulgence Show. The four-strong line up of aesthetically minimalist products continues the Heed tradition of leaving the technical conformity behind and concentrating on the reproduction of music; to stir the emotions of listeners who are more interested in the performance than the specifications.

The thesis preamplifier, power supply, phono preamp and power amplifiers have been designed to be the superclass of Heed products, building on the phenomenal success of the company’s Obelisk range. The unconventional and almost heretical approach to circuit design taken by the engineers is far from the accepted norm, in the pursuit of a life-like sonic presentation to render the music’s full complexity, atmosphere and tension.

Thesis, for all its unconventional design, is no bare-bones purist creation in a home made box. It is a range of cutting edge 21st century products, using only the highest quality components and very carefully designed circuitry installed into precision engineered, “retro-futuristic”, cases of a quality normally only found in far costlier high-end audio.

The range is centred around the thesis α (alpha) preamplifier, which features two analogue and four digital inputs including S/PDIF, TOSLINK, BNC and USB. Building on the Heed DAC and USB 2.0 Audio modules used in the company’s Obelisk DA digital to analogue converter, the digital section is modular in design to allow future upgrades. The twin capacitor-coupled output stage allows the use of long interconnect cables for connection to two sets of power amplifiers.

For vinyl connoisseurs, the thesis φ (phi) is a no-compromise phono preamplifier for use with top-class turntables requiring very low noise characteristics, huge dynamic range, plenty of headroom and an extremely smooth frequency response. The thesis φ is a twin circuit design, independently catering for both MM and MC cartridges. Two turntables may be connected simultaneously and cartridge matching is highly user customisable for gain and impedance.


The twin power supply thesis π (pi) can feed the thesis α preamp and thesis φ phono stage simultaneously. Independent sections, each with dual regulated power supply rails and high-grade components, custom made by Airlink and Mundorf to Heed’s specifications, ensure an absolutely clean and stable power delivery. Massively over-specified for the purpose, the thesis π provides a smooth and effortless performance even when pushed to its limits.

The muscle comes from the thesis ω (omega) monobloc power amplifier. In true Heed fashion this is an AC-coupled device that drives loudspeakers in a similar way to valve power amplifiers. Although its topology is similar in some ways to a valve design, the thesis ω is firmly solid state, but without the sterile and lifeless performance of many solid-state devices. The thesis ω demonstrates a synergy of solid-state stability and the finesse and “live magic” usually only achieved with valves. The generously over-sized power supply delivers a totally silent operation and up to 160W continuous power.

UK distributor, Connected Distribution will be demonstrating thesis in the Pouilly Suite, Mezzanine Floor.