A team of Boston Globe reporters brought a noise level meter to some of the T’s most infamously screechy stops. Here's what they found.

Given the nature of their network, the early telephone pioneers’ efforts at sound level metering were based on line losses over a “standard mile” of cable. Meters calibrated to this standard ...

An instrument for measuring the level of sound pressure in DECIBELs. Such measurements are called sound level readings. See: SOUND LEVEL. Sound level meters usually ...

Or jackhammer, or chain saw loud. That’s what the Globe discovered at several of the T’s most infamously noisy sections, with help from a sound level meter that measured the decibel output of ...

Here's the volume level you really should set, according to experts. (Spoiler: It's quieter than you think, especially for babies.) ...

The major difference is that CNEL can be measured using ordinary dBA readings (see SOUND LEVEL METER), as opposed to the computer calculation of EFFECTIVE PERCEIVED NOISE LEVEL used in the NEF. As ...