ATC SCM100A
¥ 1,560,000 (2 units 1 set, sold in July 1990)
Commentary
Speaker system with built-in electronic crossover and 3-channel power amplifier.
The low range is equipped with SB75-314 which is a 31.6 cm cone type woofer.
75 mm diameter aluminum bobbin and voice coil of edgecopper ribbon is adopted on a 75 mm diameter aluminum bobbin, and it is designed to be placed in a uniform magnetic flux even for high power input, so that uniform linearity and braking force are obtained.
The mid-range is equipped with SM75-150 which is 7.5 cm soft dome type mid-range.
This unit contains a magnetic circuit with a gap length of 5 mm, similar to an ordinary woofer, and an edge-wise copper ribbon voice coil with a winding width of 3.5 mm. The coil diameter is 75 mm, the same as the dome diameter. Coupled with a double suspension mechanism, this unit can withstand at least 10 times the power of a typical mid-range radio and has an extremely wide and smooth directivity.
The SH25-100, a 2 cm soft dome type tweeter, is installed in the high range.
Built-in electronic crossover and dedicated power amplifiers for the woofer, mid-range and tweeter.
MOS FET elements with high linearity and low crossover distortion are used for power devices, and the output that matches each unit is supplied.
In addition, in order to improve safety against excessive input, we use ATC's own high-speed response gain reduction circuit and thermal protection limiter in the high frequency section. These circuits act only as sensors to prevent interference with signal transmission.
The crossover is an active type of 12dB/oct and has a phase compensation function so that the frequency response at the crossover point can be adjusted according to the listening environment.
It also features mid-range and high-level controls and a balanced input terminal.
The enclosure is a bass-reflex type with an internal volume of 100L using MDF material.
The surfaces are finished with natural wood plywoods and waxed after sealing with satin lacquers.
The front baffle can be attached and removed for professional maintenance.
The final adjustment before shipment is done strictly with the stereo pair.
There were 4 types of exterior finish.
The size of the heat sink of the amplifier part was different depending on the catalog. There may be some variations.
Model Rating
Method | Built-in Amplifier / 3-Way / 3-Speaker / Bass Reflex System / Bookshelf Type |
Units Used | For Low Band : 31.6 cm Cone Type (SB75-314) For Middle Area : 7.5 cm Dome Type (SM75-150) For High Range : 2 cm Dome Type (SH25-100) |
Frequency characteristic | 35 Hz to 20 kHz -6dB |
Max Input | 300W continuous 500W (peak) |
Output sound pressure level | 88dB/W/m |
Crossover frequency | 380 Hz, 3.8 kHz |
Input terminal | 3 pin XLR (male, 1G, 2 -, 3 +) |
Input Sensitivity / Impedance | 1V/10k Ω or More |
Built-in amplifier output | Bass:200W Mid:100W High:50W |
Level control | Mid/High : ± 3 dB |
External dimensions | Width 398x Height 832x Depth 488 mm |
Weight | 74kg |