ESOTERIC S-03 Power Amplifier 2017

The power supply for the front stage and the drive stage are separated and each is made into a dual mono, four-section independent "2x2 Dual Mono" power supply is adopted. By separating the power supply for the front stage (voltage amplification stage) which handles weak signals and the drive stage (current amplification stage) which has large current fluctuations, the focus is outstanding even at full drive, and overwhelming dynamics are obtained. The power transformer for the drive stage is a custom specification that pays attention to the material, size, mounting method, etc. In order to lower the output impedance of the amplifier and increase the speaker driving ability, nine bus bars are used for each channel in all stages, and the coil of the output stage is eliminated, and a circuit design that pursues low impedance and simple / wide range is adopted. It has a current supply capacity of 17A for continuous operation and 34A for instantaneous operation, and adopts a large bipolar LAPT (Linear Amplified Power Transistor) element that is nearly twice the size of a general power transistor, and aims to improve high power and high frequency characteristics. The power amplifier module is a three-stage Darlington configuration with 5 parallel push-pull bipolar LAPT elements. In order to bring out the high-frequency characteristics of the bipolar elements, a simple amplification circuit has been created with as few parts and parallel connections as possible. A unique LIDSC (Low Impedance Drive Stage Coupling) circuit is used to lower the output impedance from the second to the final drive stage and increase current supply capacity. The input terminals are 1 RCA and 1 XLR. The traditional two-layer chassis configuration and the robust internal structure made of 2mm steel plate have dedicated compartments for each circuit block, minimizing the signal path. ■Rated output: 145W+145W (8Ω) 290W+290W (4Ω)

■Maximum practical output: 580W+580W (2Ω)

■Frequency response: 5Hz-100kHz (+0dB, -3dB, 8Ω) S/N ratio 115dB (IHF-A)

■Total harmonic distortion: 0.003% (1kHz, 8Ω, 145W)

■Gain: 29dB

■Damping factor: 1000

■Input terminals: 1 RCA, 1 XLR

■Input impedance: RCA: 22kΩ XLR: 44kΩ

■Power supply: AC100V, 50-60Hz

■Power consumption: 440W (160W when no signal)

Accessories: Instruction manual, power cable, original box.

Size W(Width): 445 mmH(Height): 221.5 mmD(Depth): 476 mm

Weight 48 kg