Wiki Citation Code for this advert:
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<ref name="mz24451-sigma-sound-enterprises-ex231-stereo-electronic-crossover">{{cite magazine|name=Sigma Sound Enterprises EX231 Stereo Electronic Crossover|date=Apr 1979|title=Sigma Sound Enterprises EX231 Stereo Electronic Crossover|page=6|url=http://www.muzines.co.uk/ad/24451|magazine=Sound International|publisher=Link House Publications|location=United Kingdom|access-date=2025-01-20}}</ref>
[{{cite magazine|name=Sigma Sound Enterprises EX231 Stereo Electronic Crossover|date=Apr 1979|title=Sigma Sound Enterprises EX231 Stereo Electronic Crossover|page=6|url=http://www.muzines.co.uk/ad/24451|magazine=Sound International|publisher=Link House Publications|location=United Kingdom|access-date=2025-01-20}}]
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<ref name="mz24451-sigma-sound-enterprises-ex231-stereo-electronic-crossover">{{cite magazine
| name = Sigma Sound Enterprises EX231 Stereo Electronic Crossover
| date = Apr 1979
| title = Sigma Sound Enterprises EX231 Stereo Electronic Crossover
| page = 6
| url = http://www.muzines.co.uk/ad/24451
| magazine = Sound International
| publisher = Link House Publications
| location = United Kingdom
| access-date = 2025-01-20}}</ref>
[{{cite magazine]
| name = Sigma Sound Enterprises EX231 Stereo Electronic Crossover
| date = Apr 1979
| title = Sigma Sound Enterprises EX231 Stereo Electronic Crossover
| page = 6
| url = http://www.muzines.co.uk/ad/24451
| magazine = Sound International
| publisher = Link House Publications
| location = United Kingdom
| access-date = 2025-01-20}}
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