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<ref name="mz24335-sigma-sound-enterprises-ex231-stereo-electronic-crossover">{{cite magazine|name=Sigma Sound Enterprises EX231 Stereo Electronic Crossover|date=Feb 1979|title=Sigma Sound Enterprises EX231 Stereo Electronic Crossover|page=33|url=http://www.muzines.co.uk/ad/24335?theme=2|magazine=Sound International|publisher=Link House Publications|location=United Kingdom|access-date=2025-01-05}}</ref>[{{cite magazine|name=Sigma Sound Enterprises EX231 Stereo Electronic Crossover|date=Feb 1979|title=Sigma Sound Enterprises EX231 Stereo Electronic Crossover|page=33|url=http://www.muzines.co.uk/ad/24335?theme=2|magazine=Sound International|publisher=Link House Publications|location=United Kingdom|access-date=2025-01-05}}]
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<ref name="mz24335-sigma-sound-enterprises-ex231-stereo-electronic-crossover">{{cite magazine
| name = Sigma Sound Enterprises EX231 Stereo Electronic Crossover
| date = Feb 1979
| title = Sigma Sound Enterprises EX231 Stereo Electronic Crossover
| page = 33
| url = http://www.muzines.co.uk/ad/24335?theme=2
| magazine = Sound International
| publisher = Link House Publications
| location = United Kingdom
| access-date = 2025-01-05}}</ref>[{{cite magazine]
| name = Sigma Sound Enterprises EX231 Stereo Electronic Crossover
| date = Feb 1979
| title = Sigma Sound Enterprises EX231 Stereo Electronic Crossover
| page = 33
| url = http://www.muzines.co.uk/ad/24335?theme=2
| magazine = Sound International
| publisher = Link House Publications
| location = United Kingdom
| access-date = 2025-01-05}}
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