Audio Database

SC-A7
Commentary

The latest technologies such as α -Boron diaphragm and polypropylene polymer diaphragm are used in this speaker system to enable digital sources.

A 32 cm cone type woofer is installed in the low range.
The diaphragm is made of a polypropylene polymer material with a transmission speed about 2.5 times that of paper, and rigidity is improved by adopting concentric corrugation ribs created by vibration analysis.
In addition, large flat dampers, long voice coils with high heat resistance, and aluminum die-cast frames are used to achieve higher quality bass reproduction.

A 6 cm hard dome type skoker with α -Boron diaphragm is mounted in the middle area.
This diaphragm is made of a material in which boron compound and alumina particles are fused in a porous state on the surface of an aluminum alloy foil. Boron compound and other materials are struck against the aluminum alloy foil at a speed close to the speed of sound in a high temperature of over 10,000 degrees Celsius by the plasma jet welding method to form a layer and physically bond the layers together. As a result, the diaphragm has approximately three times the rigidity of a titanium diaphragm and approximately ten times the internal loss of a conventional metal diaphragm.
In addition, a strontium ferrite magnet and a double suspension that eliminates the rolling of the voice coil and acquires linearity of phase characteristics are adopted, and strong support is provided by a large aluminum die-cast frame.

A 2.5 cm hard dome type tweeter using α -Boron diaphragm is mounted in the high range as well as the middle range, and it is combined with strontium ferrite magnet and aluminum die-cast frame to improve the high range reproduction.

Level control is provided for the middle and high frequencies.

The enclosure uses a rigid particle board and is a bass-reflex type with a capacity of 71L.

Model Rating
Method 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type
Units Used For low band : 32 cm cone type
For Middle Area : 6 cm Dome Type
For high-pass : 2.5 cm dome type
Playback frequency band 30 Hz to 50 kHz
Maximum allowable input 140W (program source)
Input impedance 6 Ω
Average output sound pressure level 92dB/W/m
Crossover frequency 800 Hz, 5 kHz
Level control Continuously Variable Mid Range and High Range
External dimensions Width 390x Height 700x Depth 385 mm
Weight Approx. 23 kg