At its heart, Sonnet 118 explores the irony of making oneself "sick" to avoid a perceived future illness. Shakespeare uses the language of Elizabethan medicine—specifically the practice of taking bitter potions to stimulate appetite or purging the body to prevent sickness—to describe a lover who seeks out other partners simply because their primary relationship has become "too sweet".
— by definition, loudness in sones doubles every time perceived loudness doubles. Sone 1 → 40 phons (40 dB @1kHz). Sone 2 → 50 phons. Sone 4 → 60 phons. Doubling continues: 8 sones = 70 phons, 16 = 80, 32 = 90, 64 = 100, 128 = 110 phons. sone 118
Shakespeare argues that by trying to anticipate a loss of interest or a "fault," the speaker actually created the very "fault" he feared. At its heart, Sonnet 118 explores the irony
If we were to interpret "sone 118" as an exceptionally high level of loudness: Sone 1 → 40 phons (40 dB @1kHz)