Page 19 Advertisement 2

New Zealand Listener, Volume 14, Issue 352, 22 March 1946, Page 19

DOSOSOS8 0s0 SOSOSOSOSOSOCOCOSSOSOCOS0C C 0L U MBUS Intern a ti 0 n a [ M 0 DE L 9 0 SOCOCOS0 OCOCOCOCOS0 08080808 Discriminatory Tone Control a highlight of fidelity reproduction VERYONE is familiar with the Nation-wide Service HONE E tone control incorporated in most DISTANT radios, to vary tone from treble Whangarei, Auckland, Hamilton, Rotorua, STATIONS to bass This result is achieved by a Gisborne, Napier, Hastings, Dannevirke, IDEUIY Al; Low VOLUME variable resistance, which as it is turned Taihape, New Plymouth, Wanganui, Palm- Medium Norhal towards the "bass position progressively erston North; Masterton, Wellington, REDRIGLD cuts down the treble notes. Nelson, Greymouth, Christchurch, Timaru; As far as it goes, such a method of Oamaru, Dunedin; Gore, Invercargill: tone "control" (in reality it is curtail- ment of the higher tonal register) , produces a reasonably pleasing result: But when it comes to a critical analysis of tone, it cannot be said that elimination of high notes is a highly desirable way of achieving "mellow" tone else, why include violins and flutes in orchestral arrangements. In Model 90, Columbus has tackled tonal reproduction in a radically different way_ By incorporating a variety of alternative circuits in the radio an opportunity to select blend of tone is offered to the listener. The tone control may be switched through a variety of positions where emphasis of treble, of bass Or of both, may be selected to the particular blend which suits the listener. The advantage of this discriminatory type of tone control is strikingly illustrated in comparison with an orthodox radio operating at low volume. Everyone has noticed that when the conventional radio is turned down for quiet listening , the music reproduced sounds thin and lacking in body. That effect arises from & notable deficiency in the operation of the human car At low volume levels, the human ear is less sensitive to notes of low and high pitch than it is to notes of medium pitch. Consequently when an ordinary radio is turned to low volume the treble and bass notes tend to become inaudible and only the middle register comes through. Hence the lack of body in tonal reproduction. Model 90 corrects this deficiency by "boosting" the CQLUMBUS treble and bass when the radio is operating at low volume, thus restoring full body to the quality of tone without affecting the volume. RAD/ 0 Next Week: LOUDSPEAKER DESIGN S A new International COLUMBUS Model 90 the Columbus development of unsurpassed tonal excellence. most modern radio receiver in the world: