What ridiculous answers, biased in favor of Sellers. The buyer is the injured party here. Seller did not deliver a working product; it was defective.
btw, Buyer’s supposed acceptance of a changed deal was without consideration; it is not an enforceable modification to the agreement. Seller would have needed to obtain new tweeters anyway, to sell those speakers as anything other than damaged/not working.
the burden of Supply-chain issues - delivery of a presumably promised working product - falls on Seller. Seller has had the benefits of Buyer’s funds for 5 months; Buyer got nothing but grief, so far.
the value and price for broken speakers is a substantially different proposition. A full or partial refund is due immediately.