Show FIR preserving TONE M I 1 IN fi ll 11 LOUD SPEAKER ho si this thir can be done and the maj I 1 ai 1 mum amount of ambli Ob obtained tiu lond speaker Is tile hie ultimate alin aim of eity inao novice as one of arc e greater range of the ie elved signals Is obtained and the necessity of wearing the ilie head phones Is t liin ii aled the loud laud speaker also its a greater number of people to livar hear ta tle he concert as with head bead phones tite the number hearing the concert Is limited to the supply of head phones abile hili mith the amplification the number of probie pi alile hearing the concert Is mailed limited to the range of the device there are arc several problems involved in the maximum amount of amplification and yet tit nt the same time pie serIng the orl original ginal tone so that it 11 will mill retain its pleasing qualities most of these problems are involved in n the maintenance of the ilie quality v of I 1 the re recel ed tolle as it Is a comparatively simple matter to amplify the ruc elved signal sufficiently lit in order to eliminate or minimize loud speaker distortion it Is necessary to know the lie causes involved the source of the trouble may be in the am amplifier in the loud speaker itself or in hi both amplifier Amp lIfler distortion may be caused ly by unequal voltage transformations in the coupling transformer at different radio fic quenches by the operation of the amplifier ampil fler tube nt at the wrong point of its characteristic and by overloading in tile the tube to the point of saturation for good amplification of telephone lione signals the inter later stage transformer should be capable of ghang a uniform transfer of voltage from about to cycles per second A good many transformers now in use do not 10 to lo tills this and their operation Is one of the principal causes for unsatisfactory tignall tig AIg nals for I 1 ur any particular plate voltage applied to the amplifier tube there ls Is a 1 I coi responding corresponding value of ne negative gathre grid gild voltage which should be applied in order to operate upon a straight 4 on of the characteristic curve and ais us secure uniform amplification vo 0 oaut lug to the loud speaker especially when using a power tube for the last stage it Is preferable to use tin an intermediate transformer with the proper constants instead of placing in the lie loud speaker directly in tile tube plate pinte circuit this keeps winding and prevents the polarizing effect that it would have upon the diaphragm A two stage amplifier will ill generally give enough ellough intensity to operate a loud speaker lit in an ordinary living room while the loud speaker mechanism itself timy be of the head telephone type with a suitable sul table horn some rec receivers elvers operate very lery well nt at moderate intensities but when very strong signals are applied to them they vibrate so violently that the diaphragms lilt the pole pieces and produce harsh sounds instead of good reproduction of tile original signals tu to handle the proper amount of energy therefore the construction must be such that reasonably strong vibrations will nill not force the diaphragm to its limit of travel the material and shape of the gin tire also important in determining ter mining the resultant tone qualities since wh what ateer eier natural periods of vibration bril tion it may have will mill bring out anin tones in III greater proportion than they should be to the remaining tones of a imis leal select selection lon the size nape and material of the horn are likewise important factors in the inal final result the high natural period of n small horn will vill tend to accentuate cent the higher tones to the exclusion of the lower ones the material front from which tile the horn Is made should be some substance which will riot not vibrate and produce rattling sounds funds thus thua we sev sec that in order to produce a combination of amplifier and loud speaker which will mill give pleasing results it Is necessary to choose the various parts with care and assemble them so eliat they will give a true re production of the original signals |