Grandioso S1

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


1 year warranty

Finance example

£4,800.00 initial 20% deposit then £640.00 per month for 30 months. Other finance terms available. Finance subject to status

Grandioso S1


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.

600W into 2Q Power Linearity for Outstanding Dynamics

A loudspeaker’s impedance can vary widely depending on the fre- quencies being reproduced. Continuous low bass and repeated fast transients from percussive instruments can impose a very demanding load on the amplifier that can require not only continuous high power outputs, but also repeated bursts of high power. Unless the amplifier’s power supply has the capacity to meet these stringent demands and do so consistently, the dynamics of the music will be compromised.

The finest materials and component parts have been used in the construction of the S1’s power supply. This enables the S1, which is nominally rated at 150 watts into 8 ohms, to deliver an impressive 600 watts into 2 ohms. This is a testament to the linearity of the S1’s power supply, and permits the full spectrum of sound dynamics to be faithfully reproduced at all volume levels.

Large-Capacity Custom Power Transformer — The Heart of the Finest Power Amplifiers

As one of the most important factors in deciding an amplifier’s ultimate sound quality, the S1’s robust power supply plays a critical role in its abil- ity to deliver high power in a linear manner. The power supply’s large 2,180VA toroidal transformer provides the foundation for the S1’s exceptional power output. With the knowledge that an amplifier’s sound quality is ultimately determined by the quality of its power transformer, the S1 employs a custom power transformer that demonstrates Esoteric’s highly developed expertise in material selection, core size and even mounting technique. To preserve the purity of the sound, separate windings are used for the left and right channels, and the transformer is securely mounted on a rigid, 5mm-thick steel base plate.

Breathtaking Speaker-Driving Power Worthy of a Flagship Stereo Amplifier

An amplifier drives the loudspeakers by converting the musical information into an electric current. While this may sound simple, considering that the output current ranges from very small to very large, it is nearly impossible to accurately drive the loudspeakers in a way that is consistently faithful to the source musical signal.

In order to optimize the amplifier’s ability to drive the loudspeakers, ways had to be found to reduce the amplifier’s output impedance to an absolute minimum. To achieve this, Esoteric’s full range of expertise was devoted to the S1. A total of nine bus bars are used across the design, and the need for an output coil has been eliminated. In addition, exhaustive efforts have been made to simplify the circuit design and widen its range. The result is the achievement of the phenomenal DF (damping factor) of 1,000, which can be considered a guideline for woofer drive capability. Even large-diameter woofers, which are notoriously difficult to drive, are provided with accurate damping, and the sound is precisely reproduced with an expansive feel across a wide range that reaches to even the lowest frequencies.

Tech spec

Rated Power Output

150W+150W (8 Ohms)

300W+300W (4 Ohms)

Maximum Power Output

600W+600W (2 Ohms)

Frequency Response

5Hz − 100kHz (+0dB, -3dB, 8 Ohms)

Signal-to-Noise Ratio

115dB (IHF-A)

Total harmonic distortion

0.003% (1kHz, 8 Ohms, 150W)



Power consumption

430W (no signal: 150W)

External dimensions (W x H x D, including protrusions)

445 × 221.5 × 497.8mm (17 5/8″ × 8 3/4″ × 19 5/8″)


47kg (103 5/8 lb)

For more information click here to visit the Esoteric website


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