Fully Balanced Preamplifier
The Grandioso F1 is a fully balanced preamplifier that descends from the Grandioso C1. It is resilient to noise, and can amplify signals purely and powerfully with low impedance.
Dual Monaural Configuration
A dual monaural configuration with separate left and right sides has been adopted for all stages; from the preamplifier stage to the final stage of the power amplifier. The inclusion of the largest amount of materials ever used in the circuits of an all-in-one Esoteric amplifier ensures both superior sound quality and channel separation.
Method for High Quality Current Transmission
In addition to regular line connections (XLR and RCA), the Grandioso F1 features the new “ES-LINK Analog” transmission method developed by Esoteric. This current transmission method utilizes the high performance of the HCLD buffer circuit and its enhanced ability to supply power at high-speed to transmit a pure and strong signal with minimal interference from the impedance of the signal route. This is the ideal method for analog audio transmission as it fully maximizes the
system’s potential when connected to a compatible device.*
*Included in the Grandioso K1 as of September 2016. A standard balance cable (with an XLR terminal) is used for connections, but the “ES-LINK Analog” method can only be used with compatible devices since it is a proprietary transmission method.
The F1’s Esoteric-QVCS* volume control employs four precision switched resistor ladder networks, which change in unison as the volume knob is rotated. This arrangement allows the signal paths for the left and right channels and their positive and negative phases to be kept totally independent and as short as possible. Consequently the sound has superb clarity, excellent channel separation and highly accurate phase characteristics. The elimination of audio board wiring to the
volume control further contributes to a reduced signal path, while preventing degradation of sound quality and helping to maintain the low distortion one would expect of a reference model.
*QVCS = Quad Volume Control System
Ultra Low Noise Logic Controls
All control systems in the Grandioso F1 are electrically separated from the main preamplifier using isolator chipsets and contained in the front panel to effectively minimize noise.
High Precision Ball Bearing Control Knobs
Employing the same high-precision bearing system used in our VRDS transport mechanisms, the F1’s volume control knob and selector switch provide exceptionally smooth operation with an analog feel free of any mechanical play. Sparing no cost, the front panel and all panel knobs are custom-machined from solid aluminum.
Dual Mono Phonostage Preamp
The dual mono phonostage preamp (MM/MC) features independent left and right channel power sources and independent circuits.
High-Quality Headphone Amplifier
The powerful headphone amp provides abundant output to effectively drive even difficult to power high-end high-impedance headphones.
3-Band Tone Control (Treble/Middle/Bass)
Commitment to achieving all the quality associated with high-end components results in a balanced dual monaural configuration
consisting of four circuits (L/R, -/+) for each band. This system enables users to adjust tone settings free of any concerns about sound quality deterioration. Shifting the variable band more than usual toward the high and low frequency ranges (14kHz/63Hz) permits fine adjustment of bass and treble without adversely affecting the original source signal. Fully electronic control also permits fine adjustment of up to ±12dB in 0.5dB steps.
Parallel Push-Pull, Class A, 30W+30W(8 Ohm)
The Grandioso F1 adopts a newly-designed parallel push-pull Class A power amplifier circuit to bring out the most of the ESOTERIC MODEL200 silicon carbide MOSFET. This faithfully adheres to the Esoteric amplifier philosophy of using impressive quantities of the finest materials while adopting a minimal circuit configuration to ensure the shortest signal route, and achieves both pure amplification and speaker drive ability rivaling that of separated models.
Balanced Power Amplifier Input Stage
The front stage of the power amplifier has been balanced to achieve clean amplification at low impedance and further increase the dynamic range heard by the listener.
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 F1’s robust power supply plays a critical role in its ability to deliver high power in a linear manner. The power supply’s large 1,000VA toroidal transformer provides the foundation for the F1’s exceptional power output. With the knowledge that an amplifier’s sound quality is ultimately determined by the quality of its power transformer, the F1 employs a custom power transformer that demonstrates
Esoteric’s highly developed expertise in material selection, core size and even mounting technique.
The power supply also features 40,000μF block capacitors for each channel in a dual monaural configuration. Large-gauge cable is used in all connections to help minimize impedance. This outstanding power section achieves a theoretically linear power output ranging from 30W at an 8Ohm load to 60W at 4Ohm for faithful reproduction of every musical dynamic.
Low Impedance for Enhanced Drive Capability
The speaker output section utilizes eight 1mm-thick bus bars formed of high-purity OFC and MOSFET switching with no mechanical contacts. This design minimizes signal impedance and enhances drive capability of the F1.
3D Optimized Chassis Construction
The F1’s 3D Optimized Chassis features robust construction that gives each circuit block its own dedicated compartment. Interference between circuits is effectively minimized while achieving the shortest possible cable routing. Chassis exteriors are formed of thick aluminum panels manufactured without compromise following the same design philosophy imbued in Esoteric’s separate amplifiers. As a result, the F1 achieved a extremely heavy-duty construction not normally found in
conventional integrated amplifiers. Our patented steel pinpoint feet* support the F1 at four points in order to minimize the negative effects of vibration. * Patent No. 4075477
Optional Board Slot
A card expansion slot facilitates the installation of an optional “OP-DAC1” D/A Converter Board, which adds full compatibility with 11.2MHz DSD and 384kHz/32-bit PCM signal inputs.
•Organic EL display (Normal / Large font).
•Independently adjustable input gains (±18dB; 0.5dB steps).
•L/R channel balance.
•Individually selectable phase inversion for each source.
•Aluminum body remote controller can also be used to operate
Esoteric’s SACD players.
•Displayed source device names can be programed.
•Mute, dimmer and automatic display OFF functions.