The dealer was right and the buyer was wrong. Now he ended up with very expensive second hand stuff.
@inna Ha! The OP ended up with perfectly functioning speakers at a huge discount and the dealer lost around $20k in a potential sale. Not sure in what universe the dealer was right and the OP was wrong, but that the dealer came back to offer more to try to get the sale pretty much confirms they knew they made a bad business decision here and the OP is really happy — pretty much the exact opposite of what you’re saying.