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In page João Gilberto:

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With the introduction of the microphone and the amplifier in Brazil, Gilberto realized that the sound source did not need to be emitted intensely, regarding the voice and instrument, which favored subtle and internalized interpretations. On the other hand, at the time of the first "bossa nova" recordings, Brazil still did not have hi fidelity recording equipment capable of reproducing more complex sonorities. Due to that, Gilberto and Tom Jobim, Gilberto's first arranger, elaborated complex harmonies under the influence of American music, and at the same time they simplified the general sound, because of the equipment limitation.[1]