I-03 Stereo Integrated Class "D" Power Amplifier

    The Overview

    Perceiving musical impression in its original form

    Sensuous French Impressionism and spirit of German Classicism. Cool West Coast jazz and hot East Coast jazz. Dynamism of black contemporary and sophistication of Eurobeat.

    The unique characteristics of sound and flavor of music that were cut in the original master recordings are passed on to the listeners without any trimming of parts. Esoteric is committed to new developments in order to fully apply the Esoteric-original Master Sound Works concept to the integrated amplifier.


    Ingenuity that breaks from conventional concepts and use of materials without cost constraints. Esoteric has consolidated audio technologies it has fostered over years of developing separate types of amplifiers and has without compromise, applied them into creating an integral type amplifier. The result has been the birth of Esoteric's flagship integrated amplifier I-03.

    When you look at the simple body form that eliminates all excessive features, you can discover the passions of our engineers in their devotion to developing new high-end models and the flavor of reproducing music in its original form.

The Features

Esoteric MSW* Pure Class D mono block power amplifier

 The power amplifier is the core of our integrated amplifier I-03. Esoteric has introduced know-how collected through designing professional studio-use power amplifiers to the power amplifier sections of I-03. The power amplifier of the I-03 continuously balances outstanding drive power and natural tones, and conveys the essence of a master sound recording regardless of the size and efficiency of speaker combinations.

Using Esoteric MSW Pure Class D power amplifier with dual mono architecture

 The I-03 is equipped with a MSW Pure Class D power amplifier that is mounted with high-efficiency and uses the latest high-speed MOS-FET devices in a 3-parallel push-pull configu-ration to achieve superior speaker drive performance. This power amplifier uses power amplifier blocks mounted in a dual mono architecture separately for each channel to obtain a high practical-use maximum output of 320W+320W (6Ω).

Analog power circuit support for robust drive performance

 A solid power supply unit makes the music pulse. The I-03 adopts powerful analog power circuits configured using large-size capacitors and high-capacity custom transformers (each transformer weighing approximately 10 kg (22 lbs.)). The MSW Pure Class D power amplifier produces an optimal and distinc-tive tone that is both robust and smooth.

Bi-amplifier and multi-amplifier drive support

The I-03 responds flexibly to system upgrades of the future. The I-03 is equipped with a RCA output terminal that can be switched between PRE OUT and REC OUT. Any level offset can be set for signals sent to the power amplifier during the PRE-OUT output stage. The I-03 also offers a bi-amplifier architecture that allows connecting various types of external power amplifiers with different input gains.

High-grade dual mono preamplifier with C-03 technologies.

 The I-03 preamplifier inherits stereo preamplifier C-03 technolo-gies that are highly reputed worldwide and have received a number of awards. This type of preamplifier uses a dual mono architecture with a completely independent board for each channel. The chassis compartment dedicated for the preampli-fier is partitioned using a 2mm thick steel plate to install two preamplifier boards for the left and right channels.

Volume controls based on dual-mono concept Esoteric DVC System*

 Esoteric's DVC System uses a rotating control to transmit signals to two preamplifiers located on both sides of the I-03 and simultaneously drives both volume control amplifiers, (which are installed separately on left and right preamplifier boards). Volume controls are provided independently for left and right channels to maintain the left and right audio signals separately, and to achieve a clear sound quality with exceptional channel separation. Furthermore, there is no audio signal wiring from the audio board to the volume control, which significantly reduces the signal path to prevent deterioration of sound quality.
*DVC=Dual-mono Volume Control

Delicate and dynamic sound with low-noise operation

 The Esoteric DVC System control board, used for central control of the left and right channels, is installed in a compartment separate from preamplifier boards and has a separate power supply. This design assures low noise operation with a complete shutdown of the control microcomputer except at the time of receiving an operation request.


The Specs

Speaker Outputs
Rated output power STEREO 200 W + 200 W (8 Ω)
400 W + 400 W (4 Ω)
BTL BTL 800 W (8 Ω)
Maximum output power STEREO 250 W + 250 W (8 Ω) (JEITA)
500 W + 500 W (4 Ω) (JEITA)
BTL 1,000 W (8 Ω) (JEITA)
Frequency response 5 Hz ~ 100 kHz (1 W, 8 Ω, ±1 dB)
Signal-to-noise ratio (S/N) 117 dB or more (JEITA)
Total harmonic distortion 0.009 %
(1 kHz, 8 Ω, Rated output power)
Minimum required impedance STEREO 4 Ω / BTL 4 Ω
Gain 28 dB
Analog audio inputs
Jacks RCA jacks 1 stereo
XLR jacks 1 stereo
Input impedance RCA 150 kΩ / XLR 320 kΩ
Power supply AC 230V 50Hz
AC 120V 60Hz
AC 220V 60Hz
Power consumption 550 W
External dimensions (W x H x D) 445 x 220 x 430 mm
(17 1/2" x 8 5/8" x 16 15/16" )
(including protrusions)
Weight 41.2 kg (91.5 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.