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Esoteric Grandioso M1 Monblock Amplifiers

$55,000.00 inc. GST


Audio expression, symphonic beauty, artistic passion, a concert hall spatial feel, the excitement of the audience. Esoteric’s Master Sound Works is an audio product concept that recreates all of the music information in original master recordings with the most state of the art technology available today.



Music overflowing with life. Spacious sound that can only be achieved by a high-power amplifier.

That moment when the sound is released from the speakers and the presence of the audio system disappears from before your eyes: This is the most thrilling moment of the listening experience. The overwhelming feeling of the spaciousness of sound and sense that the sounds are being generated live are enabled by the output wattage surplus power of the amplifier. The introduction of far-superior materials, such as large bipolar transistors with instantaneous 34 ampere capacity, that first enabled us to achieve 300 watts at 8 ohms high power. For a rich feeling of life, ESOTERIC’s flagship power amplifier M1 communicates the music by vibrantly setting all of the sounds free.

1200 watts at 2 ohm power linearity to amplify to the limits of sound dynamics. amplify to the limits of sound dynamics

Speaker impedance changes drastically along with changes in the frequency of the sound being played. In cases such as continuous heavy bass or the impact and subsequent silence of a percussion instrument, impedance can abruptly drop and cause a situation where there is almost no load. The full expression of sound dynamics is not possible with these sudden changes in load unless there is a current supply capacity that can be constantly followed linearly. The best materials possible have been used for the M1 power supply unit to achieve theoretical-value power linearity from 300 watts at an 8 ohm load to 1200 watts at a 2ohm load. Sound dynamics are faithfully reproduced at all volume levels.

High-capacity custom power transformer forms the core the ESOTERIC power amplifier.

The decisive element in the M1’s amazing linear high-power performance is the design of its strong power supply unit. ESOTERIC has long believed that the power transformer is the most important factor in sound design of an amplifier. The key to the overwhelming power and rich sound quality of the M1 amplifier is a custom-built ultra-large toroidal core transformer with a 3057VA core size and a mass of approximately 18 kg. Following ESOTERIC tradition, the bare (no-case) mount specs give top priority to sound quality. In order to make the fullest use of transformer performance capable of instantly supplying power from primary to secondary, the power supply unit features 16 pieces of 3,300μFF capacitors in 8-parallel configuration, with the shortened voltage charge time contributing to high-speed sound quality.

High performance bipolar LAPT transistor boasting instantaneous 34 amperes. Large bipolar LAPT* transistor components boasting the revolutionary current-supply capacity of 17-ampere continuous action and 34-ampere instantaneous action were adopted for the M1. In addition to the high power, the LAPT components also have superior high-frequency characteristics that enable them to provide subtle tonal qualities. *LAPT=Linear Amplified Power Transistor

Three-stage Darlington circuit, six parallel push-pull, two-module configuration. The power amplifier module has bipolar LAPT components in a three-stage Darlington configuration with six parallel push-pulls. To readily draw out the superior high-frequency characteristics of the bipolar components, we used a simple amplifier circuit that reduces the number of parallel elements as much as possible. By holding the number of amplifier-stage parts to a minimum and eliminating the output-stage coil, we were able to maintain signal path purity while at the same time focusing our efforts on reducing internal impedance through measures such as incorporating 16 busbars. In addition, the use of a two-module configuration mounted on two large aluminum die cast heat sinks helped to raise waste-heat efficiency and stability.

Minimization of NFB (negative feedback) minimized and realization of lively, natural sound quality. By making the amplifier circuit design as simple as possible and reducing previous-stage naked gain, we minimized negative feedback to realize a natural sound quality that overflows with full of vitality.

Dramatically heightened resolution through a current amplifier stage featuring an independent power source. The current that the drive stage (current amplification stage) supplies to the speakers always fluctuates radically. To prevent this from affecting sound quality, the current amplifier stage -which is situated just before the drive stage and which receives weak signals from the input stage-has a dedicated toroidal power transformer and power supply circuit. These provide a stable power supply to this stage, making it possible to heighten the nuanced expressive power and resolution of each instrument, even in a musical climax performed by a full orchestra. High-impedance 1M ohm input. The signal input unit was designed with 1M ohm high impedance. This reduces the load on the preamplifier output circuit and makes it possible to fully draw out the performance capabilities of all preamps.

High-grade parts used throughout for outstanding characteristics and sensitivity. We carefully selected only the highest-grade parts for the M1 that are worthy of our flagship model. These include XLR input terminals that boast high reliability and high contact performance as well as ESOTERIC original RCA input terminals. The nextgen:WBT-0705Cu terminals produced by WBT are used for the speaker terminals. The use of pure materials (pure copper + gold plate) in the conductor core achieves high conductive performance and low resistance values. In addition, The M1 employs high-grade components such as low-impedance electrolytic capacitors and transistors with superior high-frequency characteristics achieved through a strict selection process including repeated audio and material properties testing.

Ingenious chassis structure fused with the high precision and vibration suppression at a high level. The chassis is built using ESOTERIC’s traditional two-level chassis structure. The strong internal 2 mm steel-sheet framework is segregated by circuit blocks into specialized compartments, and thorough wire and circuit mutual interference prevention is done using the optimum signal paths. The bottom chassis is built from 5mm thick steel. The total block layout of the internal framework is covered with a 5 mm aluminum panel and a front panel that is cut from 35mm thick aluminum. ESOTERIC’s unique pinpoint feet provide a four-point support system that delivers a high level of rigidity with no resonance for the heavyweight housing.

Rated output power 300W(8Ω)
Maximum output power 1200W(2Ω)
Frequency response 5Hz ~ 100kHz (+0dB,-3dB,6Ω)
Signal-to-noise ratio (S/N) 122dB (IHF-A)
Total harmonic distortion 0.006% (1kHz,8Ω,300W)
Gain 28dB
Damping factor 1000
Analog audio input jacks RCAx1
Input impedance RCA:1MΩ
Power supply / Power consumption AC 230V 50Hz / 430W (no signal: 44W)
AC 120V 60Hz / 520W (no signal: 58W)
AC 220V 60Hz / 430W (no signal: 44W)
External dimensions (W x H x D) 491×221.5x535mm
(19 3/8″ x 8 3/4″ x 21 1/8″)
(including protrusions)
Weight 62kg (136 3/4 lb)

Additional Information