Peter Kember (born 19 November 1965), also known by his stage name Sonic Boom, is an English singer-songwriter, composer and record producer. He was a founding member, vocalist, guitarist and keyboardist of neo-psychedelic band Spacemen 3, lasting from 1982 until the band's dissolution in 1991. He is now based in Sintra, Portugal.

Kember has also led the musical projects Spectrum and E.A.R. (Experimental Audio Research), sometimes as the only member. He has played and collaborated with a number of artists, including Stereolab, Panda Bear, Yo La Tengo, and Sinner DC. He contributed production work on MGMT's second album Congratulations, Panda Bear's albums Tomboy and Panda Bear Meets the Grim Reaper, and Beach House's album 7.

Kember lived in Dunchurch during his childhood, and attended Rugby School until he was 16. He later attended Rugby Art College where he met Jason Pierce.

In discussing music that was important to him, Kember mentioned Kraftwerk, Sam Cooke, Laurie Anderson, Pierre Henry & Michel Colombier, Bo Diddley, the Sandpipers, Orchestral Manoeuvres in the Dark and George Faith.

Kember initially came to prominence as a member of the outfit Spacemen 3.

Kember's first solo album, Spectrum, was recorded in 1989 while Spacemen 3 were still a going concern, and featured the other members of the group. A second album, All Things Being Equal, was released in 2020. A collaborative album with Sinner DC, Maps, was released in 2025 on Mental Groove Records.

Kember recruited new musicians Richard Formby, who had previously contributed guitar and keyboards to Sonic Boom's side of the final Spacemen 3 album Recurring, and Mike Stout for the group Spectrum in 1991. Initial Spectrum releases carried on from the sound of late-period Spacemen 3, featuring conventional songs and a regular band. First single "How You Satisfy Me" was an original composition by Kember and Formby reminiscent of 1960s garage bands, based as it was upon the Chip Taylor-penned pop hit "I Can't Let Go". 1992's Soul Kiss (Glide Divine) album was split between songs and longer experimental pieces featuring drones and repetition. Another single from the album, a cover version of Daniel Johnston's "True Love Will Find You in the End" reached number 70 on the UK singles charts. Formby departed the band as soon as the album was released and Stout left not long after. Highs, Lows and Heavenly Blows (1994) featured a new line-up, primarily Scott Riley (guitar/vocals) and Alf Hardy (engineer), but also including former Spacemen 3 bass player Pete Bassman (Pete Bain), was also mainly song-oriented with Scott co-writing and taking lead on Take Your Time. Kember has occasionally collaborated with Jessamine and Silver Apples under the Spectrum name.

Since 1996 the Spectrum name has been used for Kember's solo work, sometimes with Bain and recording engineer/musician Alf Hardy. The music made with Bain and Hardy was often in the same vein as E.A.R., reflecting an increased interest in vintage analogue synthesizers, especially those made by EMS. After issuing 1997's Forever Alien album, there were no further releases of new material under the Spectrum moniker until 2008's Indian Giver collaboration with Jim Dickinson. Kember has also worked with Füxa's Randall Nieman.