Buyer Dispute

Having them checked out prior to installing the tweeters is a good idea. It’s not worth taking the chance. Another person suggested this also.

Hi again, the poster above is right.  You would hate to put the new tweets in and have them blow because of something else not working correctly within the speaker. 

Before installing the new $1K each tweeters, I would take the blown tweeters out and temporarily attach a spare cheap speaker for just a minute to ensure that no damaging voltage/other is happening.

Do your speakers have any fuses to consider?

Can’t believe some of the comments. Seller advertised working speakers. You received non-working speakers. I’m skeptical like many others that shipping caused both tweeters to fail. But it doesn’t matter, shipping damage is the seller’s problem, not yours. You paid to receive working speakers, as advertised.
 

Seller should have paid for return shipping, ordered new tweeters, had them installed himself, and put the speakers up for sale again, with the ad stating tweeters had been replaced.
 

By offering only to pay for new tweeters, the seller did not take into consideration your extended wait time to receive new tweeters, the possibility that more extensive repairs are needed if the new tweeters fail, and your time and effort to do the repairs yourself. For all that hassle, you are owed a partial refund. So, seller should have give you two options - return broken speakers for a full refund or a negotiated partial refund for your time, effort and risk in taking on the repair of the speakers yourself.
 

If I were you, I would be pissed and pursue an acceptable remedy, because as things stand the seller has ripped you off. 

 “These speakers were purchased from my local dealer new in May 2020.  They are in perfect condition and are an amazing pair of speakers.  I decided to upgrade them to the store's demo pair of 802's.  The store personnel delivered and set them up originally, and they returned to box them back up for resale”.

This sounds to me like a guilty seller providing an "excuse" prior to the sale. Maybe I am just suspicious, but it  paints a picture that is meant to preclude the complaint he knew would follow the sale.

I would file a complaint immediately and demand a refund with interest.

I asked to return them for refund several times. His last response was:

I'm not willing to do anything else.   I do not feel responsible for the backorder of parts.  You are free to purchase tweeters on your own and I'll still swap the other ones which you can resell later