$323 price is using CSCBG Main discount group. Reduce by a further $10 using code MYNL16W10 to give a final price of $313.
The RS-175 Wireless Over Ear headphone is a closed dynamic headphone with digital wireless system. Designed to offer great sound at home while you move about wirelessly. Being a closed design it features excellent noise isolation and great bass.
Features & Benefits:
Frequency response: 17 - 22,000 Hz
Operating time: Up to 18 hours
Exceptional digital audio clarity and transmission range of up to 328ft/100m (line of sight).
NB: RS175 and RS175U are the same.
I bought a pair. Compared to rs120 they are more bass heavy, I had a bit of static on the rs120 which is noticeable if the volume is high and there is a quiet part in the movie. The RS175 doesn't have this problem because it uses a digital RF wireless signal. The rs175 isn't quite as comfortable because it feels a bit tighter, it also blocks our a lot of outside noises whereas the ear muffs on the rs120 were less isolating.
The reason why you would choose an RF headphone over a Bluetooth headphones is there is no latency (audio lag/delay). The other advantage is that you can add a second headphone if you wish.