TECHNICS SB G90M2 Floor Standing Speakers

Advanced Phase Precision Driver

Reproducing music with enhanced expressive spatial sound requires that the sounds coming from the speaker unit are all aligned when they reach the listener regardless of their position.
A point sound source, like in the G90M2, is one of the ideal approaches to achieve it.
A coaxial configuration was adopted and then it was combined with the originally shaped Linear Phase Plug for aligning phases and the Smooth Flow Diaphragm and smooth edge shape for minimum sound reflection.

The SB-G90M2’s 2-way coaxial speaker unit is newly developed for the reproduction of the mid- to high-frequency range in order to realise the clear and high sound quality to deliver smooth, emotion-rich music, while inheriting the concepts of point sound source and linear phase that Technics pursues relentlessly.

Linear Phase Plug

The uniquely shaped acoustic plug is positioned on the front side of the tweeter diaphragm and provides a high-resolution sound reproduction capability and a wide sound stage.
The tip of the Linear Phase Plug is made from a high modulus and density brass material. It prevents the plug from unnecessary vibration effects due to the mid-range unit, thus delivering clear and low-distortion sound.

Smooth Flow Diaphragm

The diaphragm of the mid-range unit, which is part of the coaxial speaker unit, has a shallow shape with a smooth edge to reduce sound reflections so that the disturbance to the sounds radiated from the diaphragm is minimised, resulting in excellent frequency response, phase characteristic and wide directivity.

This configuration achieves a wide sound stage and smooth and rich mid to high-frequency range.

Stationary Construction

To reproduce the sound of music with a high S/N ratio, sources of all undesirable or unwanted sound have been eliminated completely.
To that end, the balanced driver mounting architecture adopted by the previous SB-G90 model was further optimised through the extensive CAE analysis and the speaker mount baffle was newly developed for the secure mounting of the speaker units. In addition, the rigidity of the entire cabinet was strengthened to take advantage of the balanced driver mounting architecture. The strength and shape of each and every one of the parts composing the coaxial speaker was reviewed in order to remove unwanted vibrations and noise as completely as possible. What’s more, a sound path structure is provided inside the cabinet. This new and unique structure effectively eliminate standing waves that cause a resonance peak.

Balanced Driver Mounting Architecture

Unwanted vibrations generated by the speaker mount baffle have been further reduced by improving the vent holes using CAE and by allowing the one-piece woofer amount baffle to penetrate the bottom board for achieving higher rigidity. What’s more, the optimised vent holes improve the distribution of sound radiated from the back sides of speakers for enhanced response. In addition, the coaxial speaker mount baffle is separated from the woofer mount baffle to eliminate the mutual interference.
Together, they further enhance the crispness of sound and three dimensional presentation of sound field.

Standing Wave Termination Structure

To overcome the resonance of standing wave generated in speaker cabinets, a sound path structure is provided at the bottom of the woofer cabinet to guide the standing waves.
Sound absorbing material is installed at the location in the sound path where the speed of sound becomes fastest. This enables the efficient removal of standing waves, which are the cause of resonance peaks, with a minimum amount of sound absorbing material. (Patented)
This structure allows the use of all information necessary for accurately reproducing music, so the speaker system realises more vivid and natural medium and low-frequency sound.

High-Rigidity Cabinet		Inside the cabinet, the speaker mount baffle is combined with a lateral reinforcement board to provide a robust cross structure and eliminate unwanted resonance.
Highly Analysed and Optimised Components		To achieve accurate sound image localisation, structural parts such as spacers and wire grommets were analysed extensively for the elimination of undesirable vibrations and noise.
Low-Distortion and Long-stroke 16cm woofer		Two long-stroke 16cm woofer units are mounted. The magnetic circuit features double magnet, long voice coil and copper ring to produce ample driving power.
Bi-Wiring Speaker Terminal		The woofer and mid-/high-range unit are driven by separate amplifiers for the elimination of the effect of the woofer on the mid-/high-range unit. This realises clear and transparent sound.