Q100 2.1 Channel Hi-Fi Bluetooth Amplifier , Class D Stereo Audio Amplifier , Mini Home Theater Power Speaker Amp , Digital Subwoofer Amplifier, Wireless Audio Receiver , 80W+40Wx2 , Dual DSP (Black)

Nobsound 2.1 Channel Hi-Fi Bluetooth Power Amplifier, Mini Stereo Audio Amp with Dual DSP, Subwoofer Output, Desktop Mini Size, Home Theater (Q100)

Dayton Audio BST-1 High Power Pro Tactile Bass Shaker 50 Watts RMS, 4 Ohms Impedance - Turn Any Surface into a Speaker System - Generates Subwoofer Lows

Dayton Audio BST-300EX, 300 Watts RMS,Tactile Bass Shaker, 4 Ohms Impedance - Turn Any Surface into a Speaker System - Generates Subwoofer Lows