ESOTERIC Grandioso S1

ESOTERIC Grandioso S1


The origins of Esoteric’ s new S1 Stereo Power Amplifier lie in an unbounded respect for the deep emotive powers of music.

The Grandioso lineage that gave birth to the M1 Monoblock Amplifier now unveils a new standard bearer. Following in the footsteps of our M1 flagship, the new S1 benefits from its knowledge and technology, allowing it to continue in the pursuit of true perfection. Experience majestic symphonies and infinite silence as sound and spirit call to each other. The very existence of the device between them seems to fade into oblivion, no longer noticed by the listener. Without doubt, the new Esoteric S1 Stereo Amplifier defines the true spirit of fine audio, and the realization of the ultimate in musical enjoyment.

Music Overflowing With Energy — A Sense of Space That Only High Power

Can Achieve That moment when the sound from your loudspeakers seems to make the audio system disappear before your very eyes is one of the most exhilarating moments of the listening experience. That indescribable sense of spaciousness, the feeling that the music you’re hearing is truly live, can only be generated by an amplifier that offers an abundance of power in order to properly drive the loudspeakers. Employing the finest components, and massive power supplies, enables Esoteric’s amplifiers to achieve that high power output. As our new flagship stereo power amplifier, the S1 faithfully incorporates the design philosophy of our Monoblock M1, setting free every nuance of sound, and imparting to music all the vibrancy and richness of life.

  • Manufacturer's Description

    Speaker Output  
    Rated ouput power 150W + 150W (8Ω)
    300W + 300W (4Ω)
    Maximum output power 600W + 600W (2Ω)
    Analog audio inputs  
    XLR 1 pair
    RCA 1 pair
    Power supply  
      AC 230V, 50Hz
      AC 120V, 60Hz
      AC 220V, 60Hz
    Power consumption  
    AC 230V model 430W (no signal: 150W)
    AC 120V model 430W (no sginal: 150W)
    External dimensions (W×H×D)  445 × 221.5 × 497.8mm
    17-⅝" × 8-¾" × 19-⅝" (including protrusions)
    Weight 47kg / 103-⅝ lb
    Included accessories Power cord × 1
    Felt pads × 4
    Power cord support bracket × 1
    Power cord support bracket screw × 2
    Owner's manual × 1
    Warranty card × 1


    Audio performance

    Frequency response 5Hz to 100kHz (+0dB, –3dB, 8Ω)
    S/N ratio 115dB (IHF-A)
    Total harmonic distortion 0.003% (1kHz, 8Ω, 150W)
    Gain 29dB
    Damping factor 1000

    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 Esoteric 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.