Grandioso S1 Stereo Power Amplifier

    The Overview

    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.

    Airy and uplifting sound of life Unleash, high power produce

    In music and the pleasant sense of unity, and listeners to forget the presence of audio. The music of beauty, the player of hot air, realism of unparalleled sound the air feeling of the Hall, unleashing the truth, it is born by the margin of the output wattage of the power amplifier. Including the powerful power supply unit, high power resulting from overwhelming amount of input. Inherit the spirit of the mono-block M1 faithfully, stereo machine S1 of esoteric highest peak, to unleash all of the sound, tells the music for uplifting the life feeling rich.

    Overwhelming dynamics, 600W / 2Ω of power linearity

    Impedance of the speaker, with a change of the frequency to be reproduced, have been rapidly changing. Percussion of shock and immediately after the silence, such as bass consecutive impedance is rapidly lowered, it is also not uncommon for close to a no-load situation is born. Against these drastic changes of the load situation, if there is no current supply capacity to always follow the linear, you can not be as possible to express the dynamics of the music. S1 was prepared by adding the maximum amount to the power supply unit that becomes the source of the current supply capacity, from 8Ω load 150W up to 600W at the time of 2Ω load, achieving a power linearity of the theoretical value as expected. It will faithfully reproduce the dynamics of the music at any volume level.

    The nucleus of the power amplifier, large capacity custom power transformer

    It is a powerful power supply unit that has dictated the excellent power linearity of S1. Especially power transformer, the most important factor that determines the sound quality of the amplifier. "Good amplifier of sound transformer is good" group of the firm belief that, core size from the material, ranging from how to mount, You are custom specifications that gather the know-how of the esoteric. Employs a large toroidal core of 2180VA to support the overwhelming power, to be independent of the left and right channels from the winding, it is possible to mount the rigid base portion made of the interior of 5mm steel plate, we are pursuing a pure sound quality without limit . In addition, Bear mount (no case) By the specification, also considered to slight degradation of sound quality due to the case. Capacitors, dual-mono configuration in 4,700μF × 3 parallel to each channel of the power supply unit. Charge and discharge time were high-speed reduction, to pursue a no firm quality loose. Wiring of the power supply unit does not use the connector, all connected to the thick cable with a bolt, it was honed to a low impedance.

    Large diameter woofer also accurately braking, amazing speaker drive capability

    It is fed music data that has been converted to a current speaker, and to drive the speaker units. Speaker drive mechanism of the amplifier is very simple, but to only handle up to large current from the weak current, and faithfully to always music signal, making a precise drive, can be thought of as a daunting task. In order to increase the amplifier of drive capability, it is necessary to devise to reduce the output impedance of the amplifier to the limit. S1 as the approach for the low impedance, use the nine bus bar for each channel at all stages, such as eliminating the coil of the output stage, introduce various know-how. Simple and I was extremely wide range of circuit design. As a result, in the DF (damping factor), also said that the guideline value of the woofer drive capability, to achieve the astounding figure of 1000. large diameter woofer that driving is difficult also accurately braking, the massive plenty of to the lowest frequency, and you will be able to play accurately.

    High purity signal amplified in the input stage of the balance configuration

    When the power amplifier design for performing signal amplification, has been careful consideration to the reduction of noise. Receiving the signal at the input buffer amplifier balance design, and low impedance balanced signal transmission path to the amplification stage. Removing the common mode noise, and is possible to be less affected by noise in the signal path, until the amplifying stage keeping the purity of the signal transmission, and has obtained a good S / N sense. Dynamic range on the overwhelming auditory born by clean signal amplification with no noise, promises a big impression on more than numerical value on the spec. S1 is not only dynamic representation of the high-power amplifier unique, the gradient is between the music of climax and tranquility, are also combines exquisite delicacy to more finely represented.

The Features

High-performance bipolar transistor LAPT boasts the moment 34 amps


 Continuous operation 17 amps, proud of the innovative current supply capacity that moment operating 34 amps, adopted a large bipolar LAPT ※ element of nearly twice the size of a typical power transistor. And not high-power only, excellent high-frequency characteristics, you can create a delicate tone.
※ LAPT = Linear Amplified Power Transistor

3-stage Darlington circuit, 5 parallel push-pull configuration


 Power amplifier module, a three-stage Darlington configuration of the bipolar LAPT element and 5 parallel push-pull. Order to bring out obediently the excellent high-frequency characteristics of the bipolar element, it has a simple amplifier circuit to reduce as much as possible the number of parallel. Minimizing the number of components of the amplifier stage, and the like eliminated coil output stage that cause high-frequency characteristics deteriorate, while keeping the signal path pure and intensive busbar, and have ingenuity to reduce the internal impedance You.

LIDSC circuit to exert speaker driving force to thin to M1


 Without sacrificing the performance of the monoblock M1, to complete the stereo equipment, lower the output impedance of the drive stage 2 stage to the final stage, and employs a unique LIDSC ※ circuit to increase the current supply capability. Maximum amplitude is obtained in the power supply voltage, it is possible to reduce the distortion, in excellent stereo machine S1 to space factor, and has won the speaker driving ability to thin the M1.
※ LIDSC = Low Impedance Drive Stage Coupling

NFB (negative feedback), and a minimum, provide a dynamic and natural sound quality


 Simple to design as much as possible amplifier circuit, and the NFB minimized by reducing the bare gain of the front stage, achieving a natural sound quality pervade life feeling.

Voltage amplifier stage independent power dramatically increase the power of expression and resolution

 Drive stage power supply (current amplification stage) is the speaker has always vigorously change. So as not received all its influence, voltage receive a weak signal from the input stage amplifier stage (previous stage of the drive stage) is equipped with a toroidal power transformer and the power supply circuit dedicated. This stable power supply to the front stage is ensured, even in the climax to achieve a full orchestra of large organization, to increase the resolution, it delicately portrays the personality of each instrument. Voltage amplifier stage and the drive stage is coupled to the direct-less cable, we have to minimize the amplification loss.

Throughout the high-grade parts that Ultimately from both sides of the property and sensibility


 We were introduced by carefully selected worthy of the flagship model high-grade parts. XLR input terminal and the esoteric, the original RCA input terminal boasts high reliability and contact performance, speaker terminal is adopted Germany WBT Co. WBT-0702Cu. Furthermore low impedance electrolytic capacitor with excellent high frequency characteristics, transistors, low MUSES SiC of rectified noise at high speed (Silicon Carbide) Schottky barrier diodes, etc., extremely characteristic, is adopted throughout the high-grade component is reached by repeating the audition doing.

The Specs

Speaker Outputs
Rated output power 150 W + 150 W (8 Ω)
300 W + 300 W (4 Ω)
Maximum output power 600 W + 600 W (2 Ω)
Frequency response 5 Hz ~ 100 kHz (+1 W, -3 dB, 8 Ω)
Signal-to-noise ratio (S/N) 115 dB (IHF-A)
Total harmonic distortion 0.003 %
(1 kHz, 8 Ω, 150W)
Gain 29 dB
Jacks RCA jacks 1 line
XLR jacks 1 system
Power supply AC 100V 50-60Hz
Power consumption 430 W
External dimensions (W x H x D) 445 x 221.5 x 497.8 mm
(including protrusions)
Weight 47 kg (103.6 lb)
- Design and specifications are subject to change without notice.
- This product is available in three different power supply variations shown in the chart above. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
- The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.