How do I pay?

Recruit a guy local to the seller. Search for a nearby high end shop and offer to pay someone knowledgeable a fee (whether or not you end up buying the speakers) for them to go and inspect the speakers and hopefully hear them function. Could cost between a case of beer and maybe a couple of hundred bucks.

Another one I have used is to place the money in escrow with a lawyer and have the gear shipped to them (if the speakers are 6' high and weigh several hundred pounds this may not work). They send the seller a letter saying that they have the money and will forward the money when the gear arrives and has been inspected, the only alternative being to send the speakers back.  Probably a similar cost with the lawyer if they do other stuff for you.

I wouldn't buy from a person with zero feedback without using some sort of escrow.

Nada, keep looking

Jimmy,  He might get tired Negotiating with you  and move on   i don't have time to  play around with  pinchers   Good Luck 

  Jimmy,  Look at Products in person  if its not a store 
  or walk to many good deals going on today  

Don't try to pay him. Just ignore him. There's something wrong here.

I've done many transactions with relative strangers. In all cases I was aided by 2 things:

-- their feedback on relevant audio boards (if zero feedback, watch out)

-- the transactions were protected by Paypal.

Paypal is an invasive species of a company. I kind of detest them. Their rates are confiscatory/borderline silly. BUT...I rely on them to save my ass during arms' length audio transactions.