Pathos InPoL Heritage MkII
The Pathos InPoL Heritage MkII blends SET-like delicacy with the authority of an 80W pure Class A powerhouse. Twittering Machines found its sound richly harmonic, fast and emotionally immediate, resolving complex textures and lifelike voices with exceptional ease. Substantial Italian-built luxury, tactile dynamics and adjustable balanced connectivity complete a deeply involving reference integrated.
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Deliciously Crispy
Sound Quality
95/100
Build Quality
94/100
Features Connectivity
86/100
Value for Money
85/100
Pros
Exceptionally nuanced resolution and harmonic richness, with lifelike voices, complex overtones and naturally extended decay.
Drives varied loudspeakers with ease, delivering tactile dynamics, convincing energy and fast transient snap.
Superb build quality, plus versatile analogue connectivity with balanced inputs and adjustable-gain, phase-selectable pre-outs.
Cons
Low-frequency grip, slam and spaciousness trail some considerably more expensive rivals.
Its 80W rating is intended for 4–8 ohm speakers, making it a less suitable match for loads that dip well below 4 ohms.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 95/100
The InPoL Heritage MkII is described as exceptionally refined yet vividly alive, combining fine-detail delicacy with harmonic richness, speed and convincing musical presence. The review portrays it as a particularly compelling choice for listeners who want a large Class A amplifier to communicate voices, acoustic textures and dynamic music with emotional immediacy.
Transparency Resolution
96/100
Twittering Machines calls the amplifier a “finely nuanced and delicate dancer,” able to resolve the “finest fine grained detail” with SET-like delicacy. Complex layers of tones, overtones, effects and decays remained distinct, with sustain trailing naturally into a dark background.
Tonal Balance Musicality
96/100
The amplifier is praised for harmonic richness, tonal rightness and a “life-like rich beauty” that made familiar voices feel unusually present. Its character appears full-bodied and emotionally communicative rather than sterile, while retaining delicacy and convincing tonal complexity.
Dynamics
95/100
Despite its 80W Class A rating, the Pathos drove several loudspeaker types “with ease and flair.” The reviewer heard live-like dynamics, tactile impact, convincing energy and drive, plus strong transient snap on forceful material.
Soundstage Imaging
92/100
The review describes plucks and strums resounding clearly in both the listening room and recorded acoustic, creating a strong sense of being placed in the performance. Its handling of long decays and complex voices also suggests an open, spatially involving presentation, though imaging precision is discussed less extensively than tone and detail.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
94/100
Twittering Machines finds the Pathos “above reproach” in build quality. The 80kg amplifier also uses a substantial chassis and relay-based resistive volume control, although the review offers little detail on long-term reliability or internal construction.
Features Connectivity
86/100
Connectivity is strong for an analogue-focused reference integrated, with multiple RCA and balanced XLR inputs, adjustable-gain and phase-selectable RCA/XLR pre-outs, and two pairs of speaker terminals. Digital connectivity is available through the optional HiDac Mk2 board, which adds USB, coaxial and optical inputs.
Value for Money
85/100
The available review is highly enthusiastic about the amplifier's performance and craftsmanship, but does not directly assess its value against similarly priced alternatives. At its premium asking price, it is best suited to buyers prioritising its distinctive Class A/valve hybrid presentation and substantial execution.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
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Specifications
- Type
- Reference stereo integrated amplifier Pure class A– double INPOL technology – fully balanced-digital Bias/gain set technology
- Tubes
- 2 x ECC803S tung-sol2 X 6H30 Sovtek
- Output power
- 2 x 80W@ 8 Ohm,
- Frequency response
- 2Hz – 200KHz ± 0.5db
- Max input voltage
- 10VRMS
- Input sensitivity
- 780mVRMS
- Input impedance
- 20KOhm
- Volume regulator
- purely resistive relays
- THD
- 0,1% @ 80W
- S/N Ratio
- > 100dB
- Gain
- 33 db Unbalanced 39 db Balanced
- Analog inputs
- 2 balanced XRL line, 4 unbalanced RCA line
- Digital inputs
- Installation of optional HiDac Mk2 board isrequired to enable these inputs1 USB port type “B” for PC, 1 SPDIF coaxial,1 SPDIF optical,
- Outputs
- 1 Pre out stereo line Unbalanced RCA1 Pre out stereo line Balanced XLROutput gain selectable in 4 positionsPre-output phase can be selected
- Dimensions
- 693mm (D) X 450 (W) X 230mm (H)
- Net Weight
- 80Kg
Manufacturer's Description — Pathos
InPol Heritage represents the projectual legacy of the late Pathos co-founder, designer and inventor of InPol, Engineer Giani Borinato.
The team of Pathos technical designers pushed themselves to the very highest level with this unprecedented project; an enormous amount of time was spent with this product, which is characterised by components of the highest quality and the customary absence of compromises.
The digital bias/gain set technology with intelligent control is entrusted to the same microprocessor which regulates the volume, thus guaranteeing the performance of the amplifier itself and its ability to drive the loudspeakers effeciently.
Thanks to the optional HiDac Mk2 converter, music lovers who want the very best from the latest digital sources will find their demands fully met.
With the experience of the new InPoL2 MkII and the InPoL Legacy, we modified the InPoL Heritage consequently.
The power supply section doubled, therefore the amplifier is dual mono. We added one heat sink that increases the radiating surface and allows better placement of the MOSFETs.
Thanks to these improvements, we got a better dynamic, most of all on the low frequencies, and we enhanced the power depending on the impedance.
The power remains the same, and so does the aesthetic design. The unit is 14cm longer than the old one, and it is provided with new sealed VU meters and WBT speaker terminals.
Pure Class A
InPoL (Inseguitore Pompa Lineare – Linear Pump Follower) is a system patented by Pathos Acoustics which has enjoyed great success and won many awards.
Inpol devices have a special sonic personality obtainable only by means of this particular circuit design – fully balanced in Class A using a single solid state component in follower configuration, with high current gain and with voltage gain together. The valve amplifier amplifies the input signal voltage and InPol supplies the current to drive the loudspeakers without any further amplification. In this way the signal is entrusted to the valves and becomes a true copy of the original, with all the quality, purity and harmonic content of the original.
This technology allows an increase in the theoretical output in pure Class A of between 25% and 50% together with a low output impedance which is fundamental for the damping factor, and further improved by the double InPol.
InPol Heritage is a fully-balanced pure Class A integrated amplifier using the latest generation double-InPol circuitry.
Its generous 80-watts of InPol power will drive any type of loudspeaker between 4 and 8 Ohms, and create an incredible and emotionally-moving sound-stage.
Thanks to the (optional) HiDac Mk2 board, InPoL Heritage will be able to receive all your music from your PC by USB or from a digital source by S/PDIF.
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Authorized dealers for Pathos InPoL Heritage MkII
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- Alta Fedelta — online and in-store — Lombardia, Italy (website)
- Analogue Seduction — online and in-store — Whittlesey, England, United Kingdom (website)
- Art & Voice — online (website)
- Audio Affair — online and in-store — Deritend, England, United Kingdom (website)
- Audio Solutions — online and in-store — Indianapolis, Indiana, United States (website)
- Audio Zaal — online and in-store — Binnenstad, Utrecht, Netherlands (website)
- Auditorium — in-store — Hamburg-Mitte, Hamburg, Germany (website)
- COMMERCIAL ELECTRONICS — online and in-store — Vancouver, British Columbia, Canada (website)
- George Meyer AV — in-store — Los Angeles, California, United States (website)
and 26 more verified dealers