Mono subwoofer amplifiers, bass shaker amplifiers and tactile transducers for home theater, gaming and music.
Douk Audio G100 Bass Shaker Amplifier 100W — read reviewA purpose-built bass shaker amplifier with a TPA3116D2 chip, 50W x 2 BTL or 100W x 1 PBTL output, a 50-300Hz low-pass filter and Bluetooth 5.3 plus RCA inputs.
Douk Audio BSA-600 Bass Shaker Amplifier 230W — read reviewA TPA3255 bass-shaker and subwoofer amplifier with 230W RMS bridged output, wired remote control, and auto standby, built to drive tactile transducers for gaming and home theater.
Nobsound G2 PRO 300W Mono Digital Amplifier — read reviewA 300W mono class-D amp on the TPA3255D2 with a subwoofer/full-range switch and adjustable 40-300Hz cutoff; the base option has no power supply.
Douk Audio BS-1 50W Bass Shaker Transducer — read reviewA tactile bass transducer that turns sofas, gaming chairs and car seats into body-shaking low-frequency sources. The 2025 upgraded BS-1 pushes 50W at 6 ohms with a redesigned heat sink and chrome-plated pure copper terminals.
Douk Audio BS-2 30W Bass Shaker — read reviewA 30W tactile transducer that turns low frequencies into physical vibration for gaming chairs, sofas and sim rigs, rated 4 ohm with 50W max input and F0 of 57-63Hz.
Douk Audio G4 100W Mono Digital Amplifier — read reviewA 100W mono class-D amp with a switch that moves it between subwoofer and full-frequency duty, built on TPA3116 and two NE5532 op amps.
Nobsound G2 Mini 100W Mono Digital Amplifier — read reviewA $36.99 mono class-D amp with a four-level gain switch and adjustable bass cutoff, usable as either a 100W subwoofer amp or a full-frequency amp.
Nobsound NS-03G SUB 100W Mono Subwoofer Amplifier — read reviewA palm-size mono class-D subwoofer amp on the TPA3116D2 with a TL072 op amp, quoted at 100W into 4Ω with a 20-180Hz range and a 3.5mm input.
Nobsound NS-21G Mono Amp for Bass Shakers — read reviewA compact 100W mono amplifier for passive subwoofers and bass shakers, using a TPA3116 chip with a 20-160Hz adjustable low-pass filter and RCA plus AUX inputs.
All nine reviews here come from one store, Douk Audio's store at doukaudio.com (five Douk Audio and four Nobsound), at $36.99 to $279.99 as priced on October 23, 2026, and they are two kinds of product. Seven are amplifiers for a subwoofer or bass shaker, a transducer that vibrates a seat or platform with low-frequency sound, felt more than heard: the G100, BSA-600, G4, G2 Mini, G2 PRO, NS-03G SUB and NS-21G. Two are the shakers themselves, the BS-2 ($36.99, 30W) and BS-1 ($99.99, 50W), which need an amplifier. Compare the power rating and the load it is quoted at. The G100 gives 50W x 2 at 4 ohms or, in its mono mode, 100W x 1 at 2 ohms; the BSA-600 230W RMS at 2 ohms bridged (two channels combined into one) and 115W RMS at 4; the G2 Mini 100W at 2 ohms; the NS-03G 100W into 4 ohms; the NS-21G 100W matched to 4-8 ohms. The G4 (100W rated, 300W peak) and G2 PRO (300W maximum) do not tie their figures to a load.
Match the amplifier to what it drives. The G4, G2 Mini, G2 PRO, NS-03G and NS-21G are mono, so a stereo pair needs two; the G100 and BSA-600 list stereo and bridged-mono modes, and the BSA-600 says it can drive up to 4 shakers in mono or 8 in stereo. Check impedance: the BS-1 is 6 ohms and its listing says it must be wired to a stereo or bridged-mono amplifier, the BS-2 is 4 ohms plus or minus 15%, the G100 lists 4-8 ohms in BTL mode and 2-8 ohms in PBTL mode, and the G2 Mini 2-8 ohms. A low-pass filter passes only frequencies below a cutoff: 50-300Hz on the G100, 40-300Hz on the G2 Mini and G2 PRO, 20-160Hz on the NS-21G. The NS-03G is listed at 20Hz-180Hz with no full-range mode, while the G4, G2 Mini and G2 PRO can switch to full-frequency.
Douk Audio's store applies the same terms to every listing: shipping in 2-8 business days with duties, taxes and customs included in the checkout price unless noted; returns requested within 30 days of delivery and approved by Douk first, shipped back within 7 days of approval, with original shipping fees and duties not refunded; and a 24-month warranty for manufacturing defects, although an older policy page still says 1 year. None of the reviews gives a shipping fee or says who pays the return shipping. Power supplies differ: the G4, G2 Mini and NS-03G list a 19V adapter as optional or a checkout choice, so the base price may ship without one, while the NS-21G includes a 19V adapter; the G2 PRO sells its 32V/5A supply as a checkout option too and accepts 24-48V.
Know what you are buying. Neither a shaker nor the G100 plays full-range audio: the G100 review says its low-pass filter limits all outputs, and the BS-2 review says its effect depends heavily on mounting surface and position, so expect some experimenting. The BSA-600 review calls the effect felt rumble, not audible bass, and the shakers are not included with it. Douk Audio recommends installing the BS-1 under seating that is not fixed to the floor. On the NS-21G connect only one of RCA or AUX at a time; the NS-03G has a 3.5mm AUX input only.
| Review | Price | Power | Low-pass filter |
|---|---|---|---|
| Douk Audio G100 Bass Shaker Amplifier 100W | $72.99 | BTL 50W x 2 at 4 ohm; PBTL 100W x 1 at 2 ohm | Adjustable 50-300Hz, 24dB/octave slope |
| Douk Audio BSA-600 Bass Shaker Amplifier 230W | $279.99 | 230W RMS @ 2Ω bridged; 115W RMS @ 4Ω | 50-200Hz adjustable cutoff, plus a balance knob |
| Nobsound G2 PRO 300W Mono Digital Amplifier | $64.99 | 300W max per the page; no load or distortion level stated | PBTL/SUB switch for full-frequency or subwoofer use; SUB output for active subwoofers |
| Douk Audio BS-1 50W Bass Shaker Transducer | $99.99 | 50W nominal at 6 ohms | 20-200Hz, per the page |
| Douk Audio BS-2 30W Bass Shaker | $36.99 | 30W rated, 50W max input, 4 ohm +/-15% | — |
| Douk Audio G4 100W Mono Digital Amplifier | $44.99 | 100W rated / 300W peak, TPA3116 chip with 2 x NE5532 op amps | B/M switch: subwoofer (20-200Hz) or full-frequency (20Hz-20kHz) |
| Nobsound G2 Mini 100W Mono Digital Amplifier | $36.99 | Max 100W x 1 at 2Ω per the Parameters; the Features say 4Ω | Switchable between subwoofer bass amplifier and full-frequency amp |
| Nobsound NS-03G SUB 100W Mono Subwoofer Amplifier | $36.99 | 100W max into 4Ω, mono, banana speaker jacks | 20Hz-180Hz |
| Nobsound NS-21G Mono Amp for Bass Shakers | $39.99 | 100W rated, mono, matched to 4-8 ohm | Adjustable 20-160Hz bass cutoff |
A bass shaker, or tactile transducer, turns low-frequency signals into vibration instead of moving air like a speaker, so you feel explosions, engine rumble and deep bass through a chair, sofa or platform. The BS-2 ($36.99, 30W) and BS-1 ($99.99, 50W) are not speakers, play no full-range audio and need their own amplifier; the listings sell them singly or as a pair.
One with a low-pass filter and the right load. The BS-2 review recommends a bass shaker or subwoofer amp such as the G100, which is described as made to drive the BS-1 and BS-2. The BS-1 is 6 ohms and must go on a stereo or bridged-mono amplifier. The BSA-600 ($279.99) lists up to 4 shakers in mono or 8 in stereo; the NS-21G ($39.99) is sold for bass shakers and subwoofers.
Five of the seven amplifiers are mono, so a stereo pair means buying two: the G4, G2 Mini, G2 PRO, NS-03G and NS-21G. The G100 can power two shakers at 50W x 2 at 4 ohms, and the BSA-600 lists stereo and bridged-mono output. The G4, G2 Mini and G2 PRO reviews also say two units can drive left and right channels.
They are the G100's two output modes. In BTL it drives two bass shakers at 50W x 2 into 4 ohms. In PBTL, its mono mode, it becomes a 100W x 1 amplifier into 2 ohms for one shaker. Matched impedance is 4-8 ohms in BTL and 2-8 ohms in PBTL, per the listing, so check your shaker's ohms before choosing a mode.
Some do not. The G4, G2 Mini and NS-03G list a 19V adapter as an optional or checkout choice, and the G2 PRO sells its 32V/5A supply the same way, so pick the version with one if you need it. The NS-21G includes a 19V adapter. The G2 PRO accepts 24-48V, so the top of that range needs a 48V supply bought separately. The G100 lists a DC 15-24V supply requirement.
Douk Audio's store allows a return request within 30 days of delivery. Douk must approve it first, the item goes back within 7 days of approval, and original shipping fees and duties aren't refunded. The warranty is 24 months from purchase for manufacturing defects, with free repair or replacement, although an older policy page still says 1 year.