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Stereo Power Amplifier SE-R1

SE-R1

Reference Class Amplifier

Sets a new high performance standard for digital amplifiers by employing state-of-the-art components and innovative technologies.

Features

JENO Engine
(Jitter Elimination and Noise-shaping Optimization)

Concept of JENO Engine, Block Diagram of Digital Amplifier, Output of R1 JENO Engine
Jitter is a major cause of distortion in digital systems, and is caused by mis-timing in the master clocks used in digital-to-analogue conversion. To eliminate the degradation of sound caused by jitter, Technics has developed an original jitter reduction circuit, comprising a clock generator in the noise-shaping system to reduce jitter in the low-frequency range and a high-precision sample rate converter for suppressing jitter in the high-frequency range. Thus it reduces jitter in an ideal way over the entire frequency range.
This works with a newly-developed and original high-precision PWM (Pulse Width Modulation) conversion circuit, optimising the noise-shaping speed, the degree and requantisation number, and the PWM gradation, in order to convert high-resolution signals to PWM without causing any damage to the dynamic range. These new technologies enable new Technics digital amplifier designs to reproduce the natural and delicate nuances of music.

GaN-FET Driver
(High Speed and Low Impedance Power devices)

Block Diagram of Digital Amplifier, GaN/MOS-FET Characteristics, Photo of Circuit Board Power Amp / GaN-FET
In the speaker-driving section of the amplifier, Technics has employed a high-speed GaN (gallium nitride) FET driver device with super-low resistance. This enables the construction of a high-power amp using a single push-pull configuration, allowing the length of the large current carrying signal path to be shortened, and resulting in outstanding linearity regardless of the sound level.

LAPC
(Load Adaptive Phase Calibration)

Concept of LAPC, Gain and Delay by Conventional Amplifier / LAPC
The impedance of a speaker is not constant: it varies according to frequency, thus altering the loading on an amplifier and therefore potentially the sound. Technics is able to measure an amplifier's frequency amplitude-phase characteristics with speakers connected, and has developed a speaker impedance adaptive optimisation algorithm using digital signal processing to achieve ideal impulse response. Correction processing based on the new algorithm achieves a flat frequency response for both amplitude and phase, not possible in conventional amps, and delivering a sound with rich spatial expression.

Technics Digital Link
(Original Digital Signal Transmission)

Concept of Technics Digital Link, Block Diagram of Technics Digital Link between SU-R1 and SE-R1
Some systems use a digital link between source component and pre-amplifier, keeping the digital signal pure as long as possible: Technics Digital Link goes further. It has eliminated the volume control function from the pre-amplifier, and instead transmits the volume control information, together with the audio signal, directly to the power amplifier in digital form. The power amp's jitter reduction circuit reduces any effect of jitter in signal transmission, then performs the volume control immediately before the PWM converter. This new sound transmission interface, Technics Digital Link, supports audio signals and also eradicates inter-channel effects by transmitting the left and right channel signals separately. Technics Digital Link has achieved an ideal amplifier configuration, minimising any degradation between the pre-amplifier and the power amp, and resulting in superb stereo separation and reproduction of even the most subtle signals. The result is a more detailed and dynamic sound.

High-speed Silent Linear Power Supply

Circuit Diagram of High-speed Silent Linear Power Supply
The accurate reproduction of everything from dynamic and powerful sounds to the low-level signals expressing delicate nuances requires a special power supply in an amplifier. It needs to be both powerful and low-noise, as well as capable of responding instantly to a continuously changing audio signal without any voltage fluctuation. The power supply circuit of an ordinary amp consists of a large-capacity power transformer and a rectifier circuit: after examining ways to achieve ideal voltage and current waveforms, Technics decided to use a choke-input rectification, plus a discrete stabilised power supply circuit. These technologies incorporated in the power supply circuit enable the amp to drive the speakers powerfully under any conditions.

Battery Driven Clock Generator

The best power supply for delicate circuitry such as the clock generator in the new amplifiers is one entirely isolated from any noise or fluctuations in the mains supply. Technics has extensive experience in circuits using battery isolation, having used them to create ultra-low-noise pre-amplifier stages in past analogue amplifiers.

Dual Mono Construction

Illustration of internal structure
The main amplifier layout separates the left and right channel signal paths completely, all the way back to the secondary winding on the power transformer, to prevent mutual interference and also achieve an ideal weight balance. This design gives optimal stereo separation, and also allows the two channels to be laid out in ‘mirror image’, giving equal signal-path lengths for each channel.

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Specs

Photo of Stereo Power Amplifier SE-R1

Size and Weight

Height
241mm
Width
480mm
Depth
567mm
Weight
54kg

JENO Engine (Jitter Elimination and Noise-shaping Optimization)

GaN-FET Driver

LAPC (Load Adaptive Phase Calibration)

Technics Digital Link

High-speed Silent Linear Power Supply

Battery Driven Clock Generator

Accurate Digital Technology

  • JENO Engine (Jitter Elimination and Noise-shaping Optimization)
    GaN-FET Driver
    LAPC (Load Adaptive Phase Calibration)
    Technics Digital Link
    High-speed Silent Linear Power Supply
    Battery Driven Clock Generator
    Dual Mono Construction
    High Rigidity Metal Double Chassis

Technics Definitive Design

  • Aluminium Plain Miter Joint
    White LED Illuminated Large Level Meter
    Symmetric Structure

Output Power

  • 150 W + 150 W (1 kHz, T.H.D. 0.5%, 8 Ω, 20 kHz LPF)
    300 W + 300 W (1 kHz, T.H.D. 0.5%, 4 Ω, 20 kHz LPF)

Input Sensitivity / Input Impedance

  • UNBALANCED 1.2 V / 47 kΩ, BALANCED 1.2 V / 47 kΩ

Frequency Response

  • 1 Hz - 90 kHz (-3 dB, 8 Ω)

THD+N

  • 0.05 % (1 kHz, 75 W, 8 Ω, 20 kHz LPF)

Load Impedance

  • A or B, Bi-wiring: 4-16 Ω, A + B: 8-16 Ω

Analogue Input Terminal

  • UNBALANCED x 1, BALANCED x 1

Digital Input Terminal

  • Technics Digital Link x 1

Power Supply

  • AC220-240 V, 50 Hz/60 Hz

Power Consumption

  • 210 W

Dimensions (W x H x D)

  • 480 x 241 x 567 mm

Weight

  • Approx. 54 kg

Accessories

  • AC Cords, Operating Instructions

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