Common Loudspeaker Format

Becoming a CLF Author

Loudspeaker data suppliers, such as manufacturers and independent measurement services, can participate in CLF by requesting the reader/viewer. A list of current independent measurement services supporting the CLF:

• Pro Sound Testing Inc, USA. (CLF member)
  
• NWAA Labs, Inc., USA
  
• Institute for Acoustics and Audio Technique, Germany
  
• Tyrens AB, Sweden contact
  
• Innotronic of Scandinavia Aps, Denmark
• Brusi Acoustics
• Excelsior Audio
• Warkwyn
• to be added to this list please send an e-mail to
  

Measurement software that are known to directly export the CLF text-format from loudspeaker measurements:

• Monkey Forest
• CLIOWIn
• WinMF
• Klippel near field scanner system
  
• to be added to this list please send an e-mail to

CLF distribution binary files are created with the reader/viewer. The reader/viewer reads and checks syntax of the text format files and writes the binary file. The software allows the text format file to be edited with a dedicated editor or with a standard spreadsheet. The procedure for creating a binary format file is:

• Read and understand text format definition
• Create text file according to text format definition - the supplied examples can be used as templates
• Read text file with reader/viewer, correct any syntax or data errors
• View data to verify
• Write binary distribution file

The text format files can also be prepared using any text file editor. For example, polar data could be written from the software used to measure and process the data and then embedded in a text template that can be read and finalized with the reader/viewer. The reader/viewer includes display of polar plots and balloons allowing easy verification of the input data. Other data types, such as frequency response and impedance can be displayed graphically for simple verification.

A partially functional reader/viewer can be accessed from the download page. This version will perform all functions except saving of binary files. Once you register as a CLF Author you will receive files to upgrade to a fully functional version. You can request the upgrade by sending an e-mail to . We ask that you download, install and check out the Trial authoring kit before requesting the upgrade.

TAB-delimited text format: CLF text editor:

TAB-delimited text format: optional spreadsheet editing: