Close but no cigar ... they isn't much info available on line or from NHT
Here's some info I copied from someone's ad
System Type: 3-way vented design, Focused Image Geometry
· Driver Complement: 8" long-throw subwoofer, 6.5" polypropylene midrange, 1" fluid-cooled fabric dome tweeter
· Crossover: 3.3KHz 12db/octave high-pass and low-pass, 100Hz 6dB/oct. high-pass and 12dB/oct. low-pass
· Response: 29Hz - 25KHz, +/- 3db
· Sensitivity: 86db (2.83V at 1M)
· Impedance: 6 ohms nominal, 3.6 ohms minimum
· Recommended Amplifier Power: 35W/ch minimum, 200W/ch maximum
· Inputs: 1 pair of 5-way binding posts
· Weight: 53 lbs. each
· Dimensions: 38"H x 7"W x 15.5"D
· Finish: High gloss black
Here's a copy of the link on usaudiomart … speakers are sold but maybe the seller could help you out with more info
https://www.usaudiomart.com/details/649402958-nht-25-floorstanding-speakers/