I want to buy new speakers for 50,000 and see it used for 30,000, what should I do?

You never answered the question. What are those $50,000 speakers?

Given speakers having moving parts if want to see them 1st and know how old they are.

Some people will only buy new cars, then they are afraid to use them or move for fear of getting a mark or ding on their new vehicle. Others prefer to buy their vehicles used and pre marked for a substantial savings and they immediately enjoy their car, going everywhere and doing everything. Everything depreciate, new or used. New drops faster initially but levels off soon enough. The coin is yours to do with as you please, which of course makes the choice between new and used yours alone. Are you a new pristine item only person, no matter the cost, or are you a pre owned person to obtain the same kind of item at a good savings? Rather than asking online I would suggest you have a good long talk with the guy in the mirror. After all only you and he know your budget, your wants and your preferences.

I saved 13k on my current used speakers. Only reason I did it is I was able to drive to the seller and check the speakers out before purchase. But getting them shipped without checking them out, count me out. Items under 5k maybe.

Not a good feeling paying 50g for something that your expected to realize a 20g opened box devaluation. Given today’s market not even caring what brand or model I highly doubt they were worth 50 when new. At that price one would think you’ve spent Considerable time listening and like what you hear. If the money is there and cost doesn’t matter… It doesn’t matter. If you’re feeling pressure and sitting on a shaky fence perhaps that budget is telling you something. Definitely a personal thing, good luck with that.

Cheers