Get the ultra-quiet Vacmaster canister vacuum for $121.50, a low price for a powerful cleaner that operates at just 60 dB.

Figure 1 is based on the OP37 which has an impressive list of specs. They include a 60 MHz gain-bandwidth, making 20 kHz bandwidth compatible with gain up to 3000x = +70 dB, noise ~3 nV/Hz 1/2 which ...

Noisy environments can significantly and negatively effect our bodies, and are a great villain to concentration, learning, and productivity in classrooms and offices. Headaches are one momentary ...