. Elements of acoustical engineering. Electro-acoustics; Sound. 114 DIRECT RADIATOR LOUD SPEAKERS By suitable processing of the cone it is possible to reduce the mechanical impedance at the higher frequencies. In any case, there is some wave propagation in any diaphragm at the higher frequencies which in effect reduces the impedance of the vibration system. SYSTEM A B C DIAMETER INCHES 16 4 1 MASS OF CONE 40 1 .015 MASS OF VOICE COIL GRAMS A .35 .015 VOICE COIL MATERIAL COPPER COPPER ALUMINUM AIR GAP FLUX GAUSSES 10000 10000 10000 icf I^ r = = / ^ - ^MC. / Iff _^ ^ ^ "" ~ ^ ff N, ~ /
. Elements of acoustical engineering. Electro-acoustics; Sound. 114 DIRECT RADIATOR LOUD SPEAKERS By suitable processing of the cone it is possible to reduce the mechanical impedance at the higher frequencies. In any case, there is some wave propagation in any diaphragm at the higher frequencies which in effect reduces the impedance of the vibration system. SYSTEM A B C DIAMETER INCHES 16 4 1 MASS OF CONE 40 1 .015 MASS OF VOICE COIL GRAMS A .35 .015 VOICE COIL MATERIAL COPPER COPPER ALUMINUM AIR GAP FLUX GAUSSES 10000 10000 10000 icf I^ r = = / ^ - ^MC. / Iff _^ ^ ^ "" ~ ^ ff N, ~ / '/ ^ ( \ ^w Iff -A / J_ l\ y- ~ râ^ / in' / t \rf- - 10 â â n= â 0^ 10* = ICf ZZZ - - - - â 10* / / xâ</ 10" / u / -/ '^ â / y /' v 6 ^ IC? / / / \ / <, 1 \ \ / / / Iff / L ~ / ~ ~ ~~ / â / 8 0^ " " 10^ » 10*^. »I0= ^ " ^\<^ FREQUENCY â â â 'â â â f ^ â ^ JN^ V s \ ^ ' ' ^ -^ â " & 0* ^ â ' â â â â /" s N S 2 ' ^ 0^ « I03 8 0*^ â â 'â â â â /^ â ' â' â â \ s * ^ 0=' â " 8 0^ ' * " 0** Fig. The impedance frequency characteristics of three cone loud speakers having 1-inch, 4-inch and 16-inch diameter cones and the efficiency frequency characteristics of the three loud speakers, xmc = mechanical reactance of the cone and coil, xma = mechanical reactance due to the air load, rMA = mechanical resistance due to the air load and m = efficiency. The performance of the systems of Fig. was considered from the standpoint of efficiency. In certain cases it is desirable to examine the performance from a consideration of the velocities in the equivalent elec-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Olson, Harry Ferdinand, 1901-. New York, D. Van Nostrand company, inc.
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