Abstract: A standard waterbed is shown having added thereto a sound wave system having four loudspeaker housings positioned within the floor pedestal of the bed beneath the supporting deck for the water-filled bladder mattress. Each of these loudspeaker housings is an airtight, acoustically insulated loudspeaker enclosure that supports a loudspeaker in the top portion thereof which faces upwardly to be in alignment with the plurality of openings formed through the deck. These loudspeakers are wired to an external balance control box that includes a volume control as well as a left and right hand and a head and foot speaker volume control capability. This external balance control box is wired to a stereo amplifier of a stereo radio and/or phonographic sound system, whereby the sound waves projected from the loudspeakers cause waves to form in the water within the mattress so that a person reclining on the mattress will feel as well as hear the sound and music passing through the mattress.