Sound Digital is a semi national commercial digital radio multiplex in the United Kingdom, owned by Arqiva, Bauer Media Group and Wireless Group. The multiplex covers 73% of the population from a total of 45 transmitters.
|Licensed area||United Kingdom|
|Frequency||11A (216.928 MHz)|
|Air date||29 February 2016|
Bauer Media Group (30%)
Wireless Group (30%) 
Following the collapse of the winning 4 Digital Group bid for the second national ensemble in 2008, the capacity was re-advertised in 2014. Two bids were received, Sound Digital and Listen2Digital, a consortium run by Orion Media and Babcock International Group.  On 27 March 2015, Sound Digital were selected as the winner.
Between award and launch, Premier Praise and Panjab Radio, a Listen2Digital station, joined the line up along with DAB+ stations Fun Kids and Magic Chilled. Also, BMR and UCB Inspirational were rebranded Awesome Radio and UCB2 respectively and talkBUSINESS was replaced by Listen2Digital station Share Radio.
Test transmission commenced in February 2016, which consisted of Sound Waves and Sound Waves+ for DAB and DAB+ respectively. An official launch took place on 29 February, with the majority of stations launching on this date and the remainder following over the next month.
'Awesome Radio' was shut down on 29 August 2017
On 15 May 2018 it was announced that SDL will add 19 transmitters in the South West, East Anglia, Wales and North of Scotland, increasing Sound Digital’s coverage by nearly 4 million new listeners in more than 1.6m new households.
Heat Radio was removed from the SDL mux. 
|Service||Service ID||Bit rate||Audio channels||Description||DAB launch date|
|Absolute Radio 80s||C8D8||80 kbit/s||Mono||80s music||29 February 2016|
|Kisstory||C4D8||Classic dance, R&B, hip-hop tunes|
|Mellow Magic||C5D8||Relaxing and melodic music||15 March 2016|
|Panjab Radio||CED8||56 kbit/s||Mono LSF||Delivering extra choice for British Sikhs and Panjabi speakers||29 February 2016|
|Planet Rock||C7D8||80 kbit/s||Mono||Classic rock radio|
|Premier Christian Radio||CCD8||64 kbit/s||Mono LSF||Christian music and speech|
|Premier Praise||CDD8||Sister station to Premier Christian Radio||27 March 2016|
|Sunrise Radio||C9D8||Asian music and speech programmes||29 February 2016|
|Talkradio||C0D8||Mono||News and current affairs||21 March 2016|
|TalkSport 2||C1D8||Mono LSF||Rolling sports news and live sport commentary||15 March 2016|
|UCB2||CBD8||Christian music||29 February 2016|
|Virgin Radio UK||C3D8||80 kbit/s||Mono||Rock and pop music||30 March 2016|
|Scala Radio||CDE6||112 kbit/s||Joint Stereo||Classical||4 March 2019|
|Service||Service ID||Bit rate||Audio channels||Description||DAB+ launch date|
|Fun Kids||CFD8||24 kbit/s||Stereo HE-AAC v2||National children’s radio station||29 February 2016|
|Jazz FM||CAD7||32 kbit/s||Stereo HE-AAC v2||Jazz music||29 February 2016|
|UnionJack||C7FF||32 kbit/s||Stereo HE-AAC v2||British rock/pop||9 September 2016|
|ForcesRadio BFBS||C5E0||24 kbit/s||Stereo HE-AAC v2||Armed forces radio||24 January 2018|
|JACK Radio (UK)||CAE0||32 kbit/s||Stereo HE-AAC v2||Pop music||6 April 2018|
|Virgin Anthems||C7E6||32 kbit/s||Stereo HE-AAC v2||Pop Music||22 December 2018|
|Virgin Chilled||C8E6||32 kbit/s||Stereo HE-AAC v2||Pop Music||22 December 2018|
- "SDL National". Ofcom. Retrieved 29 February 2016.
- "A Dozen Stations Launched On New DAB Multiplex". Radio Today. Retrieved 29 February 2016.
- "More digital radio stations on their way to UK listeners". Ofcom. Retrieved 29 February 2016.
- "Two horse race for Digital 2 DAB multiplex". a516digital. 2015-01-29. Retrieved 2016-02-29.
- Martin, Roy (2015-01-29). "Orion Media partners with Babcock for D2 bid". Radio Today. Retrieved 2016-02-29.
- Martin, Roy (2015-03-27). "Sound Digital wins national DAB multiplex". Radio Today. Retrieved 2016-02-29.
- Martin, Roy. "Fun Kids to go national as DAB+ radio service". Radio Today. Retrieved 1 March 2016.
- "Sound Digital: full station list announced". a516digital. Retrieved 1 March 2016.
- "Sound Digital tests: See how hi-tech your digital radio is". a516digital. Retrieved 29 February 2016.
- "Awesome Radio Shutdown".