Technics SU-G700M2 Integrated Amplifier

A 70 Wpc digitally controlled class-D amp with MM/MC phonostage and headphone amp

The SU-G700M2 stereo integrated amplifier comes loaded with Technics full-digital core amplifier technologies such as the JENO Engine (Jitter Elimination and Noise-Shaping Optimization) for highest signal precision free of jitter and distortion, and LAPC (Load Adaptive Phase Calibration) for optimum matching to any speaker.

The JENO Engine

The SU-G700M2 power amp section uses full digital amplification employing the JENO Engine that uses a unique, high-precision PWM (Pulse Width Modulation) conversion circuit that lets an input signal stay digital all the way to the output stage.

The LAPC Advantage

Speaker impedance changes with frequency, and a power amplifier is required to drive speakers without being affected by the speaker’s characteristics. 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.

Technics has 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.

Advanced Speed Silent Power Supply

The power supply technology incorporated in the reference-class model SU-R1000 has been employed for improved speaker drive power and a greater feel of energy. The switching frequency has been increased from the conventional 100 kHz to 400 kHz to ensure a stable supply of voltage and current. The device is equipped with the same GaN FET and SiC SBD as those mounted in the SU-R1000 to deliver maximum performance from the high-speed switching power supply system.

A Super Low Noise Regulator is provided in the later stage. It prevents the decrease of regulation due to fixed switching frequency and impedes the mixing of noise into high frequencies. The result is a low-noise and high-response power supply that maximizes the performance of the digital amplifier.

Low-Noise Phonostage

The moving magnet/coil 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 analog recorded sound sources tailored to the user’s environment.

Three-Section Configuration

The SU-G700M2 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. In addition to the three-section construction, the SU-G700M2 comes with a bottom chassis featuring a two-layer construction with 1.2 mm and 2 mm steel plates, a top panel made of a 1.6 mm steel plate, and a 7 mm aluminum front panel for improved vibration damping.

Class AA Headphone Amplifier

The SU-G700M2 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 analog with high precision, thus enabling headphones to be ideally driven.

Specifications

Power Output (8 ohm, 4 ohm): 70 W, 140 W

Inputs
Analog: 2 x stereo RCA line, 1 x MM/MC phono
Digital: 2 x optical, 2 x coax, 1 x USB-B

Outputs: 1 x stereo RCA line, 1 x stereo RCA pre, 1 x 6.3 mm headphone

Dimensions (WHD): 16-15/16″ × 5-13/16″ × 16-27/32″ (430 × 148 × 428 mm)

Weight: 28 lb. (12.7 kg)