I agree with the other who say you're entitled to a refund immediately on fulfilling your responsibility of giving the speakers back to UPS. The issue is now between the seller and UPS, and you should have your money to pursue another purchase. Your willingness to make alternate "reasonable solution" is admirable but not required.
Regardless of your aggravation with the seller to this point, you're best served by keeping your cool though the negotiations until you have $ in hand. email can be a blunt instrument, and perhaps he's simply waiting until he receives acknowledgment from UPS they have received the speakers (?). It's also likely he doesn't know about the Audiogon policy (it's amazing how many 'Goners don't yet have extensive feedback) and feels he's entitled to wait resolution. If this is the case it may require a little enlightenment.
Regardless of your aggravation with the seller to this point, you're best served by keeping your cool though the negotiations until you have $ in hand. email can be a blunt instrument, and perhaps he's simply waiting until he receives acknowledgment from UPS they have received the speakers (?). It's also likely he doesn't know about the Audiogon policy (it's amazing how many 'Goners don't yet have extensive feedback) and feels he's entitled to wait resolution. If this is the case it may require a little enlightenment.