Lot of good suggestions... but... if you decide to do it:
1. Advise the buyer of your terms and let him decide if he wants to accept all the risk.
2. Have him accept risk of loss from the time you deliver the package to the shipper.
3. Allow him to select the shipper with which he is most comfortable.
4. Make sure you identify him as the shipping party - who will settle all claims if the package is damaged - FOB Shipping Point.
5. Make sure he understands the sale is final upon your receipt of the funded payment, and delivery to the shipper - there will be no returns or refunds.
6. Provide him complete pictures of the speakers before you pack them, as you wrap themy and pack them, which provide him enough detail that he is confident they are in àcceptable condition, and to provide him proper evidence to support a damage claim if necessary.
7. Mare sure you receive funded payment (cash in your bank account), before shipping.
8. Do not use PayPal, or any service, that may charge back your account, if he were to file a claim (including Audiogon, which doesn't accept these terms, generally).
9. Make sure all terms are well documented and that he has acknowledged acceptance.
You might also involve a third party (such as your bank) to function as a closing agent, who would hold his funds, pending your proof of delivery to the shipper, and release them to your account, upon receipt of such proof.
That's the only way to safely do the deal. He may not accept those terms, but that's much better than the alternative.
If you're not prepared to do all that - don't do the deal.