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PATHOS InPol Heritage MkII

PATHOS InPol Heritage MkII

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.


UPGRADE from Mk I to Mk II £5,500 plus shipping to Italy. 

  • Manufacturer's Spec

    InPoL Heritage

    Type Reference stereo integrated amplifier Pure class A
    – double INPOL technology – fully balanced-
    digital Bias/gain set technology
    Tubes 2 x ECC803S tung-sol
    2 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 is
    required to enable these inputs
    1 USB port type “B” for PC, 1 SPDIF coaxial,
    1 SPDIF optical,
    Outputs 1 Pre out stereo line Unbalanced RCA
    1 Pre out stereo line Balanced XLR
    Output gain selectable in 4 positions
    Pre-output phase can be selected
    Dimensions 693mm (D) X 450 (W) X 230mm (H)
    Net Weight: 80Kg

    UK Shipping: 

    APC Overnight (up to 30kg). The premium Next Day service is upgraded on request to 12 noon delivery / SECURITY / Saturday and various options. We have found APC to be a reliable, courteous and predictable service.


    Europe, EC, and abroad: 

    For every despatch we use a professional broker to organize the fastest and highest quality shippers, and we normally use DHL or UPS depending on territory. Our broker monitors the documentation and Customs Clearance carried out by these two reliable carriers.

    Above 30kg: 

    For UK and overseas we use pallet shipping which is a professional service and avoids risks of mishandling and loss. It is not expensive under our contractors and worth a quote.


    The Music Room enjoys a 40-year tradition of customer care and at time of writing, full 5-star Google reviews. In addition UK customers enjoy the legal rights of mail order and distant selling. 

    We have exported happily for many years and most probably have happy customers in your country who will confirm our reliability and refund in the event of mishaps. 

    Refunds can only be made by the same payment form and to the same account to avoid possible fraud or money laundering.

  • The Music Room price matching...

    The Music Room price matching...

    We are an official Unison Reseach dealer and offer the best UK prices. If you have seen this product cheaper elsewhere, Let us know; we will match or beat any price.

PriceFrom £19,995.00
"See us at the NorthWest Audio Show, 22-23 June 2024" 
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