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VEF Radiotehnika RRR Silway Silver ASW-1 subwoofer [сабвуфер] look inside + dB bass test from 20Hz to 200Hz. I use android app FuncGen. Very cheap active sub [Активный сабвуфер]. I do not recomend this sub, sound are bad. X-line sub are better and price difference not so big. Small driver for low frequency [5-ZT-1] only 8", 20c. Driver excursion bass test. Spec: Power - 100w Frequency response - from 40 to 200Hz Speaker Weight - 12.2kg Dimension - 49x31.5x25.4cm Royalty Free Music by audiomicro.com/royalty-free-music