Which is louder 60 or 70 decibels?

40 dB gain change should give about the ratio of 16 for sensed volume and loudness,

40 dB gain change gives the ratio of 100 for measured voltage and sound pressure and

40 dB gain change gives the ratio of 1000 for calculated sound power and acoustic intensity.

Go to the link: Subjectively perceived loudness (volume), objectively measured sound pressure (voltage), and theoretically calculated sound intensity (acoustic power).