6.5 inches Hi-End bookshelf speaker/loudspeaker Scan-Speak 6620 6640 7140 tweeter 18WU/8741 midrange-bass DIY
https://www.vogueparade.com/shopping/EN/100000306/1/1005003750685816/65-inches-hi-end-bookshelf-speakerloudspeaker-scan-speak-6620-6640-7140-tweeter-18wu8741-midrange-bass-diy//