Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 122 DIRECT RADIATOR LOUD SPEAKERS U <U _; Sa 3SNOdS3d -i 1 -^ ==»^ - o o o o ^ j-^ > r^ '3 !)'-'⢠= OS M cr' (UK!'' ' o -^ TD > ^ 1) ^ 5 ^â ~-» y-^ c /^ L) -^ Z -*-*' D .C o o o o aa 3SNOdS3a -^ 8 g o o ^^Z o o â .. â Q (-1 /-\^ so 3SNOdS3ti f> +J jr C (S -n c r, o rt o £ <u (U OJ r -a j: *-^ c (J I--) rt CJ E £ T3 (1) rrt jH o «^ (U 3 O LJ u 4-1 tH ^ C O 1)

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