Yamaha NS-100x monitors (need info)

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I purchased these speakers from a pawn shop for my home studio. I've searched for over a year on more info about them. Particularly, the original price, specs, if they're used in pro settings, or just hifi. Any info would help subside my curiosity.

KNOWN INFO

Yamaha NS-100X
impedance: 6 ohms
nominal input: 80 watts
music input: 160 watts

Low leakage flux double magnets
sound pressure level 91dB/W/m

Each speaker ways about 40 pounds
 
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