You may want to read this thread at DIY.. This will help guide you through construction..I assume you want to use wood ? There are members here that own 1803's that might be able to give you some measurements but this thread will help you to actually build them... I would love to see you do a build thread on them here if you do go ahead and do them..
The construction of a multicell horn - diyAudio
Edit: It seems the pics in his thread have been lost.![]()







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