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Pathos InPoL Legacy
Pathos introduces the new integrated amplifier with patented InPoL technology: InPoL Legacy
As Heritage was meant to be a tribute to the work of Gianni Borinato, co-founder of Pathos, a heartfelt acknowledgment of his innovations and contributions to the world of audiophiles, similarly InPoL Legacy represents the ideal legacy of Gaetano Zanini, co-founder, and owner of Pathos. A superb design, the ultimate in Pathos technology packed into an integrated amplifier,which takes the listening philosophy developed over 25 years by the company to extremes,both in terms of component choice and the absolute performance of this masterpiece.
We have not set limits
At Pathos, we set ourselves an ambitious goal: to make the best Pathos integrated amplifier ever, one that would match, if not surpass, the InPower and Adrenalin power amplifiers.
In designing the new InPoL Legacy, we, therefore, set no limits on ourselves – primarily concerning weight and size, which we have previously tried to limit.
The result is greater grit, never abrupt but well controlled. Large excursions in intensity are sensitive to the smallest variations: compared to other Pathos amplifiers, InPoL Legacy can boast greater dynamics and a full, complete, defined sound.
The Pathos listening philosophy is expressed in the soft, smooth, fatigue-free sound. We have also improved the nuances by choosing excellent quality components without any compromise.
The heart of the InPoL Legacy is the patented dual InPoL technology, in bridged configuration, combined with a tube stage.
InPoL soul
InPoL® (Linear Pump Follower) was created to develop an amplification stage without feedback, with limited distortion and a satisfactory attenuation factor.
For this purpose it has beenused a single solid-state component in follower confguration, with hypothetical voltage gain = 1 and with high current gain.
The polarization is pure class A to avoid crossover distortion. InPoL technology allows the theoretical pure class A efficiency to be increased from 25% to 50%.
The dual InPoL configuration allows increased power while containing circuit size. The amplifier is fully balanced, resulting in a significant reduction in noise and distortion.The tubes voltage amplification characterizes the sound of InPoL amplifiers, as rich, warm, and never tiring.
Technical features
InPoL Legacy is a fully balanced dual-mono amplifier. The power supply comes from Adrenalin and InPower, with one capacitive inductive filter per channel. The two toroidal power transformers are the largest we have ever made. While we have always previously limited the size and weight of the amplifiers, in this case, we set no limits.
Like the entire InPoL Legacy structure, the tube power supply is separate, with a toroidal transformer for each channel. The tubes are in a totem pole configuration, using 2 x ECC803s TungSol and 1 x 6H30 per channel. All power supplies are stabilized, filtered, and dissipated The excellent quality wiring is shielded.
The 100-step passive volume is adjusted by low-noise precision resistors using insulated relay switches. Input and output connections are Neutrik and WBT. InPoL Legacy weighs 140 kg. To let move and install it easily, Pathos engineers designed a special packaging with wheels.
InPoL Legacy is provided also of a set of brackets which eases to lift the amplifier and put it on the cabinet. Since not all cabinets can support such weight, Pathos designed a dedicated cabinet for InPoL Legacy.
InPoL Legacy, the ultimate Pathos integrated amplifier.
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Pathos InPoL Legacy — reference Pure Class A integrated amplifier
The Pathos InPoL Legacy stakes its claim on absolute signal purity: a fully balanced, double INPOL design with a laddered relay volume that prioritizes transparency and musicality. Sonically it delivers open mids, precise imaging and class-leading dynamics and headroom, making complex passages feel effortless and detailed. Build quality is heavyweight and meticulous—premium Vishay/Dale resistors and robust mechanical engineering underline its flagship intent. Audiophilepure notes the deliberate engineering trade-offs that favor purity over convenience, and flags two practical caveats described below. Ideal for audiophiles with high-end speakers and systems who accept a few operational compromises in exchange for exceptional, uncoloured amplification.
Pros
- Exceptional transparency and musicality driven by a fully balanced double INPOL Pure Class A topology.
- Class-leading dynamics and headroom (2×100W into 8 Ω) that handle complex transients with control and authority.
- Robust, high-end build with laddered Vishay/Dale resistor volume implementation and substantial mechanical construction.
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Cons
- Stepped relay volume produces audible tiny partial dropouts and a faint percussive artefact during 0.5dB adjustments.
- Remote-control ergonomics and reliability are poor—power and control buttons can be unreliable and hard to read.
Sound Quality
91/100
Dynamics
91/100
Pure Class A topology rated at 2x100W gives ample headroom and the topology/ratings imply very strong transient and power delivery; the review contains no mention of the amp running out of steam. The only dynamic-related issue in the review is the percussive thwup tied to volume stepping, which is an operational artifact and does not reflect lack of drive or control. Score reflects excellent, class-leading dynamics for a high-power Class A design with a minor operational caveat.
Soundstage Imaging
90/100
Fully balanced signal path and the insistence on a pure, single-resistor-per-channel ladder volume imply very good channel separation and pinpoint imaging potential. The reviewer did not provide detailed staging measurements or extended commentary on width/depth, so the score is generous based on the topology and engineering intent but remains conservative relative to reference-level claims.
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Build Quality
92/100
Construction details (laddered Vishay/Dale resistors, individual relays, fully balanced class A circuitry) and the unit's substantial physical presence support a high build-quality score. Minor usability/finish negatives (remote ergonomics and reliability) slightly temper an otherwise very robust, premium mechanical and electrical design.
Features Connectivity
82/100
Generous analog I/O for a high-end integrated: 3 balanced XLR line inputs and 3 unbalanced RCA inputs (adds to baseline capability). Unique laddered relay volume and fully balanced path are strong design features. No digital inputs, phono, headphone out, streaming, or built-in DAC are listed; the included remote exists but is reported as unreliable, which reduces practical usability.
Value for Money
86/100
Price listed at 55,000 but the reviewer did not explicitly address pricing or relative value; per QA rules a neutral baseline is applied. Reviewer accepted the design trade-offs (purity over convenience), but no strong language about price being a bargain or overpriced was given, so the score remains a neutral-to-slightly-positive assessment.
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