Stereo Power
Amplifier SE-R1
Sets a new high
performance standard for digital amplifiers by employing state-of-the-art
components and innovative technologies.
JENO Engine (Jitter
Elimination and Noise-shaping Optimization)
Jitter is a major
cause of distortion in digital systems, and is caused by mis-timing in the
master clocks used in digital-to-analog 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, optimizing the noise-shaping speed, the degree and
requantization 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)
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)
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 optimization
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)
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, minimizing 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
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 stabilized 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 analog
amplifiers.
Construction
Dual Mono
Construction
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.
Signal Path
Minimization
The length of the
signal path is kept as short as possible to improve the signal to noise ratio,
reduce potential sources of distortion and interference, and give the most
direct communication of the music.
High Rigidity Metal
Double Chassis
To support heavy
parts and components and lower the center of gravity for improved stability,
the inner chassis of the SE-R1 is made of 3-mm-thick plate, but the amplifier
uses a huge, and very heavy, mains transformer: to support this better and
reduce vibration, columns of die-cast aluminium are arranged at appropriate
intervals between the bottom inner chassis and outer chassis. The external
casing is made of a 7-mm-thick aluminium plate to resist the effect of
electromagnetic noise.
High-quality Parts
Large, newly
designed speaker terminals enable the connection of thick cables, and even the
screws are high precision to ensure they remain tight, giving a firm and
reliable cable connection. The insulators are cast iron for high rigidity and
an excellent damping effect: this reduces both susceptibility to vibration, and
the transmission of any vibration to external devices.
Specifications:
Accurate
Digital Technology:
JENO Engine,
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 and 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
Analog Input
Terminal: Unbalanced x 1, Balanced x 1
Digital
Input Terminal: Technics Digital Link x
1
Power
Supply: AC 120 / 220 V, 50/60 Hz
Power
consumption: 250 W
Dimensions
(W x H x D): 480 x 241 x 567 mm
(18-7/8" x 9-15/32" x 22-11/32")
Weight: Approx. 54 kg (119 lbs )