※Shipping service. This is a collection of productions compiled by picking up a selection from radio technology magazines. From the table of contents = basic knowledge of making speakers/making the most of the advantages of full-range speakers/how to make a multi-way speaker system/challenge idea/enthusiast style experiment note/I'll teach you know-how about making horns/If you want to play bass, use this method. The photo is a sample, so the actual item may be broken, have marks, etc.