YAMAHA YST-SW90
¥ 30,000 (1 unit, released in 1999)
Commentary
A subwoofer that uses the advanced YST method.
In the YST method, the internal woofer unit is driven by a negative resistance circuit using a low-sound reproduction technology that applies the Helmholtz resonance principle, and small amplitude inside the enclosure is extracted from the port as large amplitude sound pressure.
In the advanced YST method, the linearity at the maximum sound pressure is improved by changing the negative resistance circuit to a variable type while maintaining the characteristics of the YST method.
The unit uses a 20 cm sprue scone type woofer.
MDF material is used for the enclosure and the baffle thickness is 18 mm.
Equipped with a high cut frequency continuously variable and an auto standby function that automatically turns the power on / off depending on the presence or absence of an input signal.
There was also a model with modern cherry finish.
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Model Rating
| Method | Built-in Amplifier / 1-Way / 1-Speaker / Advanced YST System ・ Floor Type ・ Magnetic Protection Type |
| Units Used | For low band : 20 cm cone type |
| Rated output | 100W (5 Ω) |
| Playback frequency band | 23 Hz to 170 Hz |
| High-cut filter | 50 Hz to 150 Hz, continuously variable |
| Power consumption | 65W |
| External dimensions | Width 235x Height 485x Depth 409 mm |
| Weight | 14kg |
| Attachment | Speaker cord (4mx2) RCA pin plug cable (3mx1) |