WATER BED Vibroacoustics: SINGLE - DOUBLE EM.3866 - EM.3866 / 1 Water is a great medium for music and resonance or vibration. Wooden base with two vibrators incorporated. It plugs as a speaker to the stereo. EM.3866 - 200 x 100 x 46cm. EM.3866 / 1-200 x 140 x 46cm. If you want to feel the vibration / resonance any HIFI music with an output of 50 watts per channel will be valid. Or if you want you can buy the full stereo with reference: EM.3637.