Esoteric
Grandiso-S1X Grandioso Class A Stereo Power Amplifier
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Grandiso-S1X Grandioso Class A Stereo Power Amplifier
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Overview
Stereo Power Amplifier
Grandioso S1X
Open, Dynamic, but Incredibly Pure.
A New Milestone in Class-A Stereo Amplifiers – Grandioso S1X.
With the birth of the Grandioso M1X, our flagship monoblock power amplifier, the Esoteric amplifier design platform has been completely revamped. The Grandioso S1 has now been reborn as the Grandioso S1X, the new flagship in a completely different class of Class-A stereo power amplifiers.
The monoblock M1X embodies Esoteric’s idea of the ideal amplifier. The dynamic sound of the M1X, produced by a completely redesigned drive stage and a powerful power supply unit that incorporates an enormous amount of material, has captivated audiophiles around the world. The S1X, a Class-A stereo model, beautifully follows the M1X’s signature sound of “a sense of dynamism that unleashes the full power of music” and “a sense of grand scale.” In exchange for its high power of 2,400W/1 ohm, the S1X offers a half the space form factor and the transparent and detailed expressiveness that only Class-A can deliver.
Here, is a milestone model that realizes Esoteric’s ideals of the Class-A stereo amplifier.
※Grandioso (music): Grand or noble.
- Newly designed drive stage with 5-parallel push-pull drive by large bipolar transistors
- Pure Class-A operating range of 50W/8ohm provides a full musical expression that combines precision and dynamism
- “ES-Link Analog” transmission pushes the limits of fidelity between preamp and amplifier
- Superior power linearity for unparalleled dynamics (50W/8Ω to 100W/4Ω)
- Large toroidal-core power transformer that is extremely responsive to dynamic current supply changes
- 3-transformer configuration with independent power transformers for the pre-drive stage, main drive stage, and control system
- Channel independent high-capacitance Grandioso custom capacitors (10,000μF × 6/ch)
- Pure copper busbars, ultra-thick wiring, and shortest pattern connections significantly reduce internal impedance
- Balanced audio connections in each circuit block to ensure low noise
- High quality parts such as FET switch for input switching, discrete amplifier module IDM-01, etc.
- Stereo mode and bi-amp mode for further system upgradability with multiple units
- Enlarged chassis to M1X size with newly designed Class-A construction
- Chassis design optimizes internal vibration control by thoroughly pursuing a balance between “rigidity” and “flexibility”
- Dual honeycomb grille and semi-floating top panel for heat dissipation and open sound characteristics
- Pinpoint isolation foot with unique structure to reduce mechanical stress
- Unique wave-shaped heat sink to reduce peak resonance
- DC trigger input for power on/off
Spec description
| Output | |
| Rated Output | 50W + 50W (8Ω Class-A) 100W + 100W (4Ω) |
| Compatible Speaker Impedance | 4Ω to 16Ω |
| Analog Audio Inputs | |
| ES-Link Analog | × 1 pair |
| XLR | × 1 pair |
| RCA | × 1 pair |
| General | |
| Power | |
| AC 120V, 60Hz | |
| AC 220-240V, 50Hz | |
| Power Consumption | 310W (270W at no signal) |
| Overall Dimensions (W×H×D) | 491 × 221 × 536mm (including protrusion) |
| Weight | 48kg |
| Included Accessories | Power cord × 1 Delt pad × 4 Owner's manual × 1 |
Audio performance
| Freqeuncy Response | 5Hz to 100kHz (+0dB, –3dB, 8Ω) |
| S/N Ratio | 109dB (IHF-A, XLR) |
| Total Harmonic Distortion | 0.006% (1kHz, 8Ω, 50W) |
| Gain | 28.5dB (XLR) 34.5dB (RCA) |
FAQs
Please read our FAQs page to find out more.
Do you price match?
Yes. We match any authorised dealer, including big-box retailers. If you find the same product at a lower price, contact us and we'll match it.
Do you offer free shipping?
Yes — free shipping on every order, with 2-day delivery available on most products. Easy returns and exchanges are included.
Where is your showroom?
We're at 6362 Alder Drive, Houston, Texas. The showroom lets you hear and compare reference-level systems in person before making any decisions. If you're considering a larger purchase or installation, it's well worth the visit.
Can I buy online without visiting the showroom?
Yes. The full product range is available through the online store with free nationwide shipping. For more complex system builds, speaking with one of our advisers first tends to lead to a better result.
Do you offer financing?
Yes. Special financing is available through the BrandSource Credit Card for qualifying purchases, allowing you to spread payments over time with no annual fee. Promotional rebate savings are also available periodically. See the financing page for full details.
Do you install systems as well as sell equipment?
Yes — installation is central to what we do. We design and install whole-home audio and video, home theaters, media rooms, outdoor audio, lighting and motorised shades, and full smart home automation.
Do you provide support after installation?
Yes. We provide ongoing service and support to ensure systems continue performing as intended — not just on installation day, but over the long term.