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AVID Hifi Sigsum Integrated
Driven by sound quality and our uncompromising approach to offer the best in class, the sensational SIGSUM Integrated was conceived.
Our single chassis amplifier offers unparalleled performance for those that desire less clutter or with demands on their dwellings.
"Immediately it sounded effortless and in command "
- Stuart Smith
Key Features
- ALPS RK50 Volume Control
- Pulsus Integated Phono
- Headphone Amplifier
- XLR/RCA Connections
Musical Obsession
SIGSUM swiftly dispels any preconception that single chassis amplifiers limit performance. Condensing our reference designs into class leading premium products is our forte and its clarity and power will expose a musical revelation.
Lurking behind our trademark embellished front panel we have distilled, condensed and shoe-horned our reference technology into a singular monument to convey true musicality.
"There is no doubt, the AVID is an exceptional amplifier"
- Paul Rigby
awesome
Incorporating our Pulsus phono stage solidifies our vinyl heritage and with a dedicated mains transformer giving independent power to each channel, your favourite records will sound outstandingly realistic.
Independently powering the Pre and dual mono amplifiers is a phenomenally large mains transformer and capacitor reservoir, delivering an unadulterated sound through the worlds best volume control to your ears. Simply Awesome.
"A total triumph. Brilliant, even"
- Paul Rigby
What's inside
ELECTRONICS
Retaining possibly the world’s best control, the ALPS RK50 allows you hear every detail with such life and realism. Bespoke circuit design and components allows faithful reproduction with limitless headroom and dual mono amplifiers directly scaled down reference models have the ability to drive all loudspeakers comfortably.
And not forgetting our vinyl roots the built-in phono stage is the same as our award winning Pulsus phono stage. The passive RIAA circuit using high-end capacitors, helps maintain linearity of reproduction and not wanting to limit sound quality we have installed its own 35va mains transformer giving independent power to each channel. Fully flexible for any cartridge with gain and resistance easily adjustable.
POWER SUPPLY
A colossal 1100VA transformer and huge capacitors totalling 132,000uF, give an electrical reservoir the prodigious reserves that allow you to hear the slam and low frequency of live music, whilst retaining control to unearth detail and subtilty you have never before experienced.
CASEWORK
A dominating piece of audio sculpture, commanding attention with our logo carved into the 20mm solid aluminium front panel, there is a feeling of engineered solidity that is also expressed in the sound reproduction. The heavy gauge steel chassis and cover offer valued screening against environmental noise so that even the smallest musical detail is revealed. The logo hole patterning and SIGSUM name are majestically displayed for that final touch of elegance.
WATT RECOMMENDS
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Professional Reviews 91/100
Deliciously Crispy
Sound Quality
94/100
Build Quality
92/100
Features Connectivity
88/100
Value for Money
86/100
The open, highly resolving Sigsum pairs muscular control with a spacious, low-noise presentation, exposing fine detail and bass texture with ease. HiFi News and Pursuit Perfect System both praise its effortless flow, while The Audiophile Man highlights the balanced-input leap in clarity and the excellent built-in phono stage for serious vinyl systems.
What Reviewers Are Saying
Pros
Exceptional openness, separation, and low-noise detail retrieval create a wide, precise soundstage.
Effortless dynamics with strong slam and tightly controlled bass.
Built-in phono stage is highly capable, with excellent separation and cartridge flexibility.
Balanced connections unlock a noticeable jump in clarity and detail.
&
Cons
No remote control, which some reviewers see as a major convenience omission.
Midbass can feel a little shy, with slightly less warmth and fullness than some listeners prefer.
Input count is relatively limited for a high-end integrated amplifier.
SOUND QUALITY PERFORMANCE 94/100
Reviewers consistently praise the Sigsum for its very low noise floor, openness, and the way it digs out fine detail without sounding muddy or congested. It is described as neutral and clean through the midband and upper registers, with only a few comments about a slight lack of warmth and a touch of upper-vocal emphasis on some material.
Transparency Resolution
95/100
The Sigsum is repeatedly described as extremely clean, low in noise, and highly revealing. Reviewers talk about subtle decays, harmonics, and instrumental separation coming through clearly, with one calling its detail retrieval a real super-power and another noting that the balanced input mode brought out more detail and lower noise.
Tonal Balance Musicality
91/100
The overall tonal character is described as neutral, open, and classy, with a clean midband and good vocal clarity. That said, one reviewer heard a slight lack of warmth and a shy upper-midbass, and another found the top end a little too prominent on some electronica, so it is engaging but not uniformly plush or forgiving.
Dynamics
94/100
The amp is credited with superb slam, lightning-fast transient attack, and a sense of effortlessness even at low levels. Reviewers also describe it as very controlled and free of stress, suggesting strong headroom and authority rather than any sense of compression or strain.
Soundstage Imaging
95/100
The soundstage is consistently portrayed as wide, open, and airy, with excellent space between instruments and precise focus. Reviewers mention strong separation, good depth, and a presentation that feels spacious without relying on midrange emphasis to fake size.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
92/100
The reviews describe substantial physical construction, including a 20mm-thick alloy front panel, a 3mm steel chassis, a huge toroidal transformer, and a 31.2kg chassis. They also praise the feel of the controls, especially the stiff but smooth volume action, though there is little discussion of long-term reliability or durability beyond the heavy, reassuring build.
Features Connectivity
88/100
This is a well-equipped analog integrated rather than a stripped-down minimalist design: it offers balanced XLR and RCA line inputs, a built-in phono stage with extensive MM/MC adjustment, a headphone output, and a line-level output. The main omission repeatedly noted is the lack of a remote, and one review even calls the input count limited, so the feature set is strong but not lavish.
Value for Money
86/100
The reviews do not present it as a bargain, and at its asking price it clearly sits in serious high-end territory. That said, the included phono stage is praised as unusually strong and the amplifier itself is described as classically refined and highly capable, so the value case is more about justified ambition than outright affordability.
Reviews
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Verified Dealers
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Authorized dealers for AVID Hifi Sigsum Integrated
- Holt Hill — online and in-store — Andover, Massachusetts, United States (website)
- à la carte productions — in-store — Palm Coast, Florida, United States (website)
- Akalın Muzik Ltd. — in-store — İstanbul, Turkey (website)
- Alen Audio — in-store — Extramurs, Comunidad Valenciana, Spain (website)
- Anagram Audio — online and in-store — Bury St Edmunds, England, United Kingdom (website)
- Analogue Seduction — online and in-store — Whittlesey, England, United Kingdom (website)
- Andertons — online and in-store — Guildford, England, United Kingdom (website)
- ARK Audio — online and in-store — Borensberg, Östergötlands län, Sweden (website)
- Audio Centrum — Hungary (website)
- Audio Domain — in-store — Stadtbezirke I, Nordrhein-Westfalen, Germany (website)
and 52 more verified dealers