A voice is an acoustic instrument, much like a guitar or a piano. And just like other acoustic instruments, recording the voice, whether for a vocal track or an eBook, requires optimal sonic conditions. The simplicity of recording a pure voice onto a single track can become challenging in today's noisy world. Distractions abound, cars, horns, planes – ambient noise that can ruin the opportunity to capture a pristine track.
Engineers have used baffles to diminish ambient noise when recording instruments like guitar, piano, and drums for years. Why not do the same for the voice?