Built-in active preamp
As powerful as the original SM7B sounds, many studio pros say its output is lacking. To provide a good output signal, professionals link the SM7B with an in-line booster. SM7Bs with built-in active preamps make the Shure SM7dB the right answer. The SM7dB’s preamp offers +18dB or +28dB gain, and you may bypass it for original SM7B functioning.
You may use the SM7dB anywhere you would use its predecessor with the same results; just leave your in-line booster home.

SM7dB Dynamic Microphone
True dynamic versatility
The Shure SM7dB includes the same dual-tone controls as its preamp-less predecessor. This dual-band switchable passive EQ offers low-cut and presence boost controls. Flat or with a low cut, the SM7dB is an amazing mic for male dialog and vocals, but defeating the presence boost makes it an excellent choice for bright sound sources and sibilant vocalists.