F-03A Integrated Amplifier

    The Overview

    Class A Reference Model

    Setting out to create one of the most desirable integrated amplifiers available,
    Esoteric brought together a fully balanced preamplifier and a Class-A power amplifier-both directly
    derived from its well-respected Grandioso line-to created a new reference for integrated
    amplifiers that gives full expression to the smooth, full-bodied tones and delicately shaded
    textures of your favorite music. Featuring distinctive dual monaural construction that extends
    through all stages, from preamplifier inputs through to the final stage of its power amplifier
    output, the F-03A Integrated Amplifier brings out the full audio potential of Esoteric's highly
    regarded K and N Series of digital players.

    F-Series Philosophy: Basic and Complete

    Representing a new generation of integrated amplifiers, Esoteric's new F Series has been
    thoroughly invested with proven results gained in the development of our flagship Grandioso
    line of separate amplifiers. With the goal of capturing all the inherent warmth and texture of
    music, not only were the outstanding expressive powers of the Grandioso line pursued, the
    utmost limits of audio performance were also concentrated into an integrated configuration
    that offers excellent usability combined with an attractiveness that more than compensates for
    the limitations of their size. Basic and Complete. With sights set on creating a unique
    presence in the category, the Esoteric F Series is born.

The Features

A Fully Balanced Preamplifier


 One result of the lavish attention given to the development of the F Series is the preamplifier's fully balanced configuration, which derives from our highly esteemed C Series preamplifier models. Impervious to noise, it delivers pure and powerful signal amplification at ultra-low impedance.

Dual Monaural by Design

 The one design feature of these amplifiers that most clearly reflects Grandioso thinking is their dual monaural configuration, which maintains complete left and right channel independence through all stages, from preamplifier to the power amplifier's final stage. As Esoteric integrated amplifiers, the major investments made in circuit construction expertise and materials developed over the years yield excellent channel separation and a measure of sound quality that transcends the class.


 Playing a significant role in the F Series' balanced dual monaural configuration is the proprietary Quad Volume Control System (QVCS), which incorporates a total of four precision switched resistor ladder networks operating in unison to electronically and independently control the left and right channels and their positive and negative phases. This system helps maintain superb audio clarity, excellent channel separation and highly accurate phase characteristics. Further, by eliminating all volume control wiring on the audio board, the resulting shorter signal path minimizes deterioration of sound quality while realizing exceptionally low distortion.
* QVCS: Quad Volume Control System

Ultra-Low-Noise Logic Control

 As a countermeasure against noise, all control lines have been electronically separated from the main body of the preamplifier with the use of isolator elements integrated into the front panel.

High-Precision Ball Bearing Control Knobs


 Employing the same high-precision bearing mechanisms used in our Grandioso components, the F Series' volume control knobs and selector switches provide exceptionally smooth operation with an analog feel free of any mechanical play. Sparing no cost, all panel knobs are also 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. The middle band can also be utilized as a loudness preset when set to the minus side and used in conjunction with the Tone Bypass switch.

Power Amplifier Input Stage Features Balanced Configuration

 The power amplification section's front stage is balanced in line with the thinking behind our S Series separate amplifiers. Its low impedance and clean amplification further enhance the dynamic range.

Large-Capacity Custom Power Transformer - The Nucleus of the Finest Power Amplifiers

 The power supplies of the F Series feature large-core 940VA custom EI power transformers and 40,000µF block capacitors for each channel in a dual monaural configuration. Large-gauge cable is used in all connections to help minimize impedance. As in our separate power amplifiers, this outstanding power section achieves a theoretically linear power output ranging from 30W at an 8Ω load to 60W at 4Ω for faithful reproduction of every musical dynamic.

Low Impedance for Enhanced Drive Capability

 Utilizing eight 1mm-thick bus bars formed of high-purity OFC, the speaker output section employs MOSFET switching with no mechanical contacts. Coils have also been eliminated from the output stage to minimize impedance and enhance drive capability.

The Specs

Speaker output Rated output 30W + 30W (8Ω)
60W + 60W (4Ω)
Total harmonic distortion
(1kHz, 8Ω)
0.006% (30W)
Frequency response
(+0/-3.0 dB at 1W output)
10Hz - 100kHz
S/N ratio (IHF-A) 104dB
Damping factor 370
Minimum compatible impedance
Speaker output connectors 2 pairs (L/R) (screw type)
Input impedance XLR, RCA 10kΩ
Output impedance XLR, RCA 100Ω
PRE OUT S/N ratio (at 1V output)
XLR, RCA input 110dB
PHONO (MM) input 93dB
PHONO (MC) input 75dB
Gain Preamplifier 24.5dB (when VOLUME at maximum)
Power amplifier 29dB
Tone controls BASS  tone curve ±12dB (63Hz)
MIDDLE  tone curve ±12dB (630Hz)
TREBLE  tone curve ±12dB (14kHz)
General Power supply / Power consumption AC 230V 50Hz / 290W (no signal: 290W)
AC 120V 60Hz / 290W (no signal: 215W)
AC 220V 60Hz
External dimensions
(W x H x D)
445 x 191 x 468mm
(17 5/8″ x 7 5/8″ x 18 1/2″)
(including protrusions)
Weight 32kg (70 5/8 lb)
Included accessories Power cord x 1
Remote control (RC-1301) x 1
Batteries (AAA) x 2
Felt pads x4
Owner's manual x 1
Warranty card x 1
- This product is available in two different power supply variations as shown in the chart above.
Make sure that the voltageshown 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.
- Specifications and appearance are subject to change without notice.
- Weight and dimensions are approximate.