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It had revised speakers, a 66 cm (26 in) tapered waveguide for each speaker, and could play MP3 format CDs. The "Wave Music System" was released in 2004 as a replacement for the Wave Radio/CD. Production of the Wave Radio IV ceased in 2017. The "Wave Radio IV", introduced in 2015, had a significantly different appearance and controls to its predecessor, and dual alarms. The "Wave Radio III", introduced in 2007, was identical in appearance to the Wave Radio II and added Radio Data System (RDS) and a large snooze button on top of the unit. It used a dual tapered waveguide and revised speakers. The "Wave Radio II" was introduced in 2005 and was based on the Wave Music System without the CD player. Unlike the Acoustic Wave, the Wave Radio could be used as an alarm clock radio, and featured two independent alarms, which could be set to A/M or F/M radio, a buzzer, or a device plugged into the auxiliary input.
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The end of the waveguides were tapered by 2%.
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A "Wave Radio/CD" model was introduced in 1998 and was essentially a Wave Radio I with a CD player. It was smaller than the Acoustic Wave Music System and used two 2.5-inch speakers. The "Wave Radio" (which has since become known as "Wave Radio I") was an AM/FM clock radio that was introduced in 1993.