These topics are in english or in german/english:

• car audio ISO-plug standard
  
• audio connectors of car-manufactors
  
• audio connectors of radio-manufactors
  
• some translations of the german terms for the connectors are here.
• FAQs for construction of loudspeaker-boxes
  
• TSPs and data list of hundreds of speakers
• download and FAQs for speaker construction software BassCADe
  
• Many links to speaker and semiconducters manufactors
  

The rest are in german language only. But mail me if you have questions or problems.
   ;)

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