S4 Stereo Preamplifier
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S4 Stereo Preamplifier

Single-ended, zero feedback circuit topology and demanding pure Class A valve operation and removing the need for a phase splitter.
Fully symmetrical construction and offer a wide range of symmetrical (XLR) and asymmetrical (RCA) inputs and corresponding outputs.
The pre-amplifier circuit boards are of symmetrical double-mono construction.
The elaborate volume regulator is created by an R-2R network that has the same impedance at 128 possible, logarithmically tuned
    levels and guarantees an extremely good synchronism down to the lowest volumes.
The new design uses low noise toroidal transformer in external supply.
Build in DS audio EQ and MC/MM phono.
Build in high-quality headphone amplifier.
All-metal infra-red remote control handset.
The components and materials employed are uniformly of top quality.

Input

MM/MC*1 / Optical*1 / RCA*1 / XLR*2

Input Impedance

MC: 56/100/220/470/47K
MM: 47K
OPT: More than 10K
RCA/XLR: 170K

Output

RCA*2 / XLR*1 / Headphone XLR-4pin

Total harmonic distortion (THD+N)

MM<0.02%, MC<0.05%, OPT<0.04%
RCA<0.0015%, XLR<0.0015%

S/N R

MM: 78dB A-Weighted
MC: 70dB A-weighted
Optical: 75dB A-weighted
RCA: 110dB A-weighted
XLR: 110dB A-weighted

Gain

MM: 52dB / MC: 72dB / OPT: 32dB
RCA/XLR: 20dB

Power Requirement

Standby: 0.5 Watt
Maximum: 90 Watts

Casing

All Aluminum

Dimension (WxDxH)

300x279x66mm*2

Weight

Net Weight 4.5KG(Power) / 3.5KG(Pre)
Shipping Weight 10KG

A $4,000 Bargain? - KECES S4 Preamp Review
AA425器評KECES S4.PDF
HIFISTATEMENT-KECES S4-Part 1 (EN).PDF
HIFISTATEMENT-KECES S4-Part 2 (EN).PDF
HIFISTATEMENT-KECES S4-Teil 1 (DE).PDF
HIFISTATEMENT-KECES S4-Teil 2 (DE).PDF
想要一部具備頂級線路設計的Class A(甲類)前級放大器,同時又符合現代發燒友的要求?
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KECES S4 Pre-Amplifier S300+ Power-Amplifier Review by HIFIPIG.PDF
Notes on the KECES Audio S300+ Power Amplifier and S4 Stereo Preamplifier by Positive-feedback.PDF