This is continued from the previous post on using only one 2N3053 transistor to drive a sensitive speaker at great sound quality.
When the battery supply is reduced to 1.5V the operation is still in class A (electrons flowing all the time through the transistor and through the speaker too since it is a DC amplifier).
At 1.5V the sound intensity is low and the quality exceptional high. This is aided by the point source mono speaker with no tweeter needed. And by the great sensitivity of the ear. All instruments can be heard with pristine clarity.
But the point is that the low intensity should greatly aid a singer to sing in tune since pitch perceptions depends not only on frequency but on intensity too (Stevens).
In older times low acoustic intensity was automatically given to the singer since everything was live. Musicians cared not to play too loud. The engineer cared that there should not be much leakage to the singer's mic etc. and great engineers and producers such as Phil Ramone immediately knew that if the singer had a problem singing in tune the monitoring (level?) should be corrected.
The proposed simple class A battery operated amplifier signal path is:
Backing track - Pleiades 2N3053 amplifier - PHILPS AD 5046N or equivalent
If a great quality hi Z full range speaker is not available then a great quality 8Ω full range speaker can be used and it's impedance stepped up to 800Ω by a transformer.
References:
Sound and Hearing - Stevens, Warshofsky - Time Life science series
Making Records - Phil Ramone
http://euroelectron.blogspot.gr/2018/03/madonnas-voice-coming-from-point-source.html
http://euroelectron.blogspot.gr/2018/04/pleiades-2n3053-operating-with-6v-3v-15v.html
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