Japan-Built Grand Class SU-G700 Conveys Energy, Dynamics, and Detail of Music with Effortless Finesse: Integrated Amplifier Loaded with Cutting-Edge Technology and Features
Some audio equipment causes you to obsess over it on the basis of looks alone. Showcasing vintage-style meters, an ultra-clean 7mm-thick aluminum front panel that could double as the grille of a luxury car, and two stately knobs, the Technics SU-G700 integrated amplifier is one such example. But this Japanese-built Grand Class component also offers breathtaking sound and modern connectivity that in every way match its resplendent aesthetics. Without doubt an object of desirability and preeminent instrument, SU-G700 conveys the energy, dynamics, detail, and tones of music with effortless finesse and addictive emotionalism. And the fact it harbors a built-in phono preamplifier with a first-stage FET, Class AA headphone amplifier, 24-bit/192kHz Burr-Brown PCM1804 DAC, two pairs of line-level analog inputs, multiple digital inputs, and a USB-B input that supports up to DSD 11.2MHz and 32-bit/384kHz PCM means it serves as a convenient one-box solution.
A perfect complement to the company's SL-G700 streaming SACD/CD player, the 27.2-pound SU-G700 incorporates reference JENO Engine technology and a unique pulse-width modulation circuit to transmit and process signals with minimal jitter from input to the power stage. By optimizing noise-shaping speed, degree, and quantization number, even data even within the wide dynamic range of high-resolution sources gets converted to PWM signals without loss. SU-G700 brings similar innovation to the high-speed, ultra-silent power supply, which touts a linear regulator with high-definition electrolytic capacitor for superb voltage stabilization.
In terms of drive, the conservatively rated 70Wpc unit's Load Adaptive Phase Calibration (LAPC) ensures optimal gain and phase characteristics for any type of speaker. The cutting-edge technique enables flattening the frequency characteristics of amplitude and phase – previously off-limits to amplifiers – and delivers rich spatial expression. Technics also made painstaking efforts to ensure outside noise stays out of the way of SU-G700 and that purity remains paramount. For the PC input terminals, power conditioners with non-magnetic carbon film resistors and high-quality ruby mica capacitors featuring low dielectric loss, high voltage resistance, and temperature stability guard against various types of distortion. And, during operation, SU-G700 utilizes an Optimally Activated Circuit System that disables digital modules to further retain clarity.
Such efforts extend to the 5.81 x 16.94 x 16.84-inch (HWD) SU-G700's three-section construction. Partitions are installed between the circuit blocks according to the signal level handled, eliminating interference between circuit blocks and suppressing internal vibration. On the outside, the double chassis counts a 1.2mm-thick steel-plate inner chassis and a separate steel-plate outer chassis. Meanwhile, a 2mm-thick steel bottom plate achieves a low center of gravity.
A remote control, three-year manufacturer warranty, and those thoroughly gorgeous design elements complete an integrated amplifier certain to inspire excitement and supply lasting pleasure. 100% Music Direct Guaranteed.
"An amplifier is not supposed to have a sound of its own, it shouldn't have a signature. In fact, you shouldn't be aware of its presence at all. From that perspective, the SU-G700 excels. Its whizzbang tech under the hood is no joke, and the resulting performance is something worth seeking out and hearing for yourself, if for no other reason than to put to rest this notion that digital circuitry can't be musical and emotionally engaging."
– Andrew Robinson, Home Theater Review, 4.5-star review
"Technics' SU-G700 is a lovely, lovely integrated amplifier-DAC, and I had more fun with it than I've had with any other amp I've reviewed in the past two years. Its styling respects the Japanese company's history while still looking cool -- especially those big, blue-tinted power meters. While its digital amplifier circuit is cutting-edge, its inclusion of analog RCA and moving-magnet phono inputs makes it more flexible than you might expect..."
– Hans Wetzel, SoundStage! Network, Reviewers' Choice
JENO Engine (Jitter Elimination and Noise-shaping Optimization)
In order to faithfully transmit the massive amount of audio data sent to the speakers without loss, the SU-G700 power amp section uses full digital amplification employing the JENO Engine, based on the design concept of reference systems. In order to solve the issue of sound quality degradation due to jitter, which poses problems for conventional digital amplifiers, SU-G700 has an original jitter reduction circuit that eliminates jitter over the entire audible frequency range. Also, a unique, high-precision PWM (Pulse Width Modulation) conversion circuit is used for PWM conversion, which is important for sound quality. By optimizing items such as the noise-shaping speed, degree, and quantization number through our unique expertise, data even in the wide dynamic range contained in high-resolution sound sources is converted to PWM signals without loss. These technologies provide reproduction of natural and finely detailed sound, enabling perception even of delicate music nuances.
LAPC (Load Adaptive Phase Calibration)
Speaker impedance changes with each frequency and a power amplifier is required to drive speakers without being affected by the speaker's characteristics. However, conventional digital amplifiers are connected to speakers through a low-pass filter at the output stage, so they are even more strongly affected by the speaker impedance characteristics. Also, although the amplitude characteristics of conventional amplifiers due to negative feedback were improved, the phase characteristics could not be enhanced. We thus developed a speaker impedance adaptive optimization algorithm that performs correction to the ideal impulse response through digital signal processing by measuring the frequency amplitude-phase characteristics of the amplifier with the speakers connected. This new technique enables flattening the frequency characteristics of amplitude and phase, which had previously not been achieved by amplifiers, as well as delivering a sound with rich spatial expression.
Digital Noise Isolation Architecture
For the PC input terminals, the amplifier uses power conditioners with non-magnetic carbon film resistors that provide strong protection against magnetic distortion, and high-quality ruby mica capacitors featuring excellent characteristics such as low dielectric loss, high voltage resistance, and temperature stability. Sound reproduction with greater purity was pursued by blocking the incursion of outside noise.
In integrated amplifiers there are a variety of circuits, including circuits that handle the micro-signals of inputs and those that handle a large current, such as output circuits and power-supply circuits. SU-G700 uses a three-section construction with partitions installed between the circuit blocks according to the signal level handled. This eliminates interference between circuit blocks, thus achieving clear sound quality. Also, the chassis rigidity due to this construction suppresses the vibration of electrical parts, thereby suppressing deterioration in sound quality.
Low-Noise Phono Input
The phono input achieves low noise by using a differential parallel connection configuration of a first-stage, low-noise FET. In addition, four-level gain adjustment enables selection of the best gain according to the cartridge output. This enables optimal playback of high-grade analogue recorded sound sources tailored to the user's environment.
Class AA Headphone Amplifier
SU-G700 uses a Class AA headphone amplifier with separate amplifier circuits for voltage amplification and current amplification of the audio signal. The voltage is amplified by a high-grade operational amplifier, the current is amplified by an operational amplifier with high current-supply capability, and the high-grade PWM signal output from the JENO Engine is converted to analogue with high precision, thus enabling headphones to be ideally driven. This makes it possible to reproduce music with low distortion and a wide frequency range.
Battery-Driven Clock Generator
The best power supply for delicate circuitry such as the clock generator in new amplifiers is one entirely isolated from any noise or fluctuations in the mains supply. Technics has extensive experience in power supply isolation using batteries. This technology creates ultra-low-noise preamplifier stages.