Stereo amplifier Technics SU-G700EE-K

Reference class high quality audio technology

Using reference class technologies, the JENO Engine amplifier transmits and processes digital audio signals with minimal distortion at all stages of processing. Loudspeaker Load Based Phase Calibration (LAPC) technology provides ideal gain and phase response for all types of loudspeakers. The new low distortion switching power supply ensures accurate power supply by suppressing modulation frequency fluctuations caused by load changes.

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JENO Engine Digital Amplifiers to Eliminate Distortion and Optimize Noise Shaping

To faithfully transmit large volumes of audio data to lossless headphones, the SU-G700 amplifier unit uses JENO Engine digital signal amplifiers, which use reference-class system technology. The SU-G700 uses a special distortion-reduction circuitry over the entire audible frequency range to address the problems of audio degradation due to distortion common to conventional digital amplifiers. In addition, a unique precision conversion module is used for pulse-width modulation (PWM), which is essential for sound quality. Using our company's own know-how to optimize parameters such as shaping speed, degree and quantization, high-resolution audio data with a wide dynamic range can be converted into lossless PWM signals. These technologies allow you to reproduce the sound naturally, with full detail, highlighting the smallest nuances.

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Load Based Phase Calibration (LAPC) technology

The impedance of the speaker changes every time the frequency changes, so a power amplifier is needed to supply power to the speaker without changing the characteristics of the speaker itself. At the same time, conventional digital amplifiers connected to speakers through a low-pass filter in the output stage are even more dependent on the speaker impedance. In addition, although negative feedback allowed us to improve the amplitude characteristics of conventional amplifiers, the phase characteristics could not be improved. All this led our specialists to the decision to create an adaptive impedance optimization algorithm that adjusts the impulse response through digital signal processing, measuring the frequency amplitude-phase characteristics of the amplifier with connected speakers. This new technology has smoothed amplitude and phase frequency responses never before achieved in amplifiers, resulting in a rich, spatialized sound.

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High speed quiet hybrid power supply

When connected to a conventional switching power supply, the modulation frequency changes as the load fluctuates to adjust the pulse timing to stabilize the output voltage. These fluctuations in the modulation frequency adversely affect the sound quality. The new power supply reduces noise that negatively affects sound quality by adjusting the modulation frequency. The last stage of the switching power supply also contains a linear regulator that stabilizes the output voltage and uses proprietary high-resolution electrolytic capacitors.

In addition, the currently used resonant power supply can reduce the noise level. Noise absorbing components such as capacitors have been carefully selected. Every effort has been made to reduce noise and ensure clarity of reproduction.

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Digital Noise Reduction Architecture

The PC input signal amplifier is additionally equipped with voltage stabilizers based on thin non-magnetic carbon film resistors, which reliably protect against magnetic interference, as well as high-quality Ruby Mica capacitors, which are characterized by low dielectric losses, high resistance to impact and temperature stability. Isolation from external noise allows you to achieve higher purity of sound.

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Three-node layout

"The built-in amplifiers use a variety of circuits that process both micro-signal inputs and high-precision signals such as output signals and power signals. The SU-G700 is divided into three nodes with baffles to separate circuits of the same signal level from each other and prevent mutual interference between the circuits, thereby improving the sound quality.In addition, this design increases the strength of the frame and does not allow vibration of electrical components, and with it the deterioration of sound quality. "

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Optimal circuit activation system

The optimal circuit activation system allows you to stop the operation of various digital modules (display module, analog and digital interfaces) to reduce noise when playing music.

Battery Clock Power Supply

The best option for a circuit as sensitive as the clock circuit of the new amplifiers is to completely isolate the oscillator supply circuit from any noise and fluctuations in the mains. Technics has significant expertise in isolated battery power, featuring ultra-low noise in the pre-amplifier stages.

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High quality analog circuit

A high-quality 192kHz/24-bit analog-to-digital converter [Burr-Brown PCM1804 (Texas Instruments)] is used to accurately convert the input analog signal to digital, which improves the clarity of sound reproduction in an all-digital system when playing audio from analog sources. High resolution relays are used for signal switching.

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Low noise PHONO horn input

The low noise level at the PHONO input of the audio signal can be achieved by differential parallel connection of a low-noise FET of the first stage. In addition, 4-level gain control allows you to choose the best value depending on the signal at the output of the cartridge, which ensures optimal reproduction of high-quality analog recordings for this listening environment.

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Class AA Headphone Amplifier

The SU-G700 uses a class AA headphone amplifier with dedicated audio voltage and current amplification circuits. The first circuit uses a high quality op amp, the second circuit uses a high current op amp. The high PWM output of the JENO Engine is accurately converted to analog, providing pure audio to headphones. This allows you to play music with low distortion and a wide range of frequencies, regardless of the headphone load impedance.

A - Voltage amplification is performed without load current, which ensures amplification accuracy.

B - The required current is supplied to the load depending on the voltage at the output of the voltage amplifier.

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Rugged aluminum body

The robust double frame consists of an inner and outer frame (both made of steel plates). This design reduces vibration and noise, which negatively affect the purity of the sound. To secure heavy components and move the center of gravity down for better stability, the inner frame is made of 1.2mm thick plate. The bottom surface of the case is made of 2mm thick steel plate, which improves vibration absorption and further lowers the center of gravity. The front panel is made of 7 mm thick aluminum plate resistant to electromagnetic noise.

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