I can’t lie: Sennheiser’s naming system is getting a bit confusing. The names of the Sennheiser HD 450BT and HD 4.50BTNC differ in only two aspects: the NC at the end of 4.50BTNC (obvious), and the decimal point (not so obvious).

On the other hand, the two headphones sound fairly different. They’re also priced significantly differently, with the HD 450BT at $200, and the HD 4.50BTNC at a paltry $120. So the question for the day is: is the HD 450BT worth it over the HD 4.50BTNC? It’s actually a pretty complicated question – these two headphones sound similar in a lot of ways.
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https://majorhifi.com/comparison-sennheiser-hd-450bt-and-hd-4-50btnc/