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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.
Dealers selling AVID Hifi near you
AVID Hifi Sigsum Integrated — muscular build, transparent presentation
The Sigsum makes its case with a colossal, over-engineered chassis and an impressively open, transparent sound that prioritises detail and control. Reviewers from Ken Kessler / HiFi News, Paul Rigby / The Audiophile Man and Pursuit Perfect System note its wide, airy soundstage, lightning-fast transients and low noise floor, delivering excellent dynamics for a 110W Class AB design. Built-in strengths include the high-quality Pulsus phono stage with extensive MM/MC settings, balanced XLR inputs and a robust headphone output. The machining, toroidal PSU and heavy alloy front plate underline premium construction. Ideal for vinyl enthusiasts and listeners seeking forensic clarity and control, the Sigsum rewards systems that favour neutrality over added warmth — a specialist integrated that offers convincing sonic pedigree and long-term durability.
Pros
- Exceptionally open, low-noise sound with a wide, airy soundstage and precise imaging.
- Strong, controlled dynamics and fast transient attack that deliver convincing slam and headroom.
- Integrated Pulsus phono stage with configurable MM/MC gain, impedance and capacitance — high-quality vinyl front end without an external box.
- Robust, premium mechanical construction (large toroidal transformer, thick alloy front plate and solid controls).
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Cons
- No remote control — a deliberate design choice that reduces convenience for some modern listening setups.
- Relatively limited line-input count for the price class, which may constrain versatility in complex systems.
- Slightly restrained mid/upper-bass presence and occasional top-end emphasis on some digital material — may favour listeners who prefer neutrality over warmth.
Sound Quality
92/100
Dynamics
92/100
As a Class A/B 110W amp, the Sigsum is repeatedly praised for effortless delivery, superb slam and lightning-fast transient attack (HiFi News: 'superb slam', The Audiophile Man: 'music was absolutely effortless'). Reviewers report excellent control and headroom for its power class, with no signs of strain.
Soundstage Imaging
91/100
Multiple reviewers highlight a wide, airy and well-layered soundstage with precise focus and excellent instrument separation (Pursuit Perfect System: 'wide open soundstage', The Audiophile Man: 'air and spacious aspect'). Imaging is described as stable and highly detailed.
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Build Quality
90/100
Heavy, substantial construction with a large toroidal transformer, thick 20mm alloy front panel and robust chassis are noted across reviews (HiFi News, Pursuit Perfect System, The Audiophile Man). Controls and mechanical quality are praised; some comment the chassis is larger than strictly necessary.
Features Connectivity
90/100
Well-featured for an analogue-focused integrated: balanced XLR and RCA inputs, a high-quality built-in Pulsus phono stage with MM/MC settings, headphone output, and preamp outputs are present (Pursuit Perfect System, HiFi News, The Audiophile Man). Lack of remote and limited digital/streaming options slightly reduces versatility.
Value for Money
88/100
Reviews emphasise the integrated Pulsus phono stage (noted as equivalent to a ~£2k standalone unit) and strong sonic performance, suggesting the package justifies a premium (Pursuit Perfect System, HiFi News, The Audiophile Man). Limited inputs and no remote temper the overall value case, but reviewers signal a justified premium for its capabilities.
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