Offer the $1400 if you can test the speakers. If he says no, give him your number and say something like "If you change your mind, you'll have my number"

Almost always, the person will call the next day. Dont let him sucker you into paying more than you feel comfortable with (or can afford).

Set your price, give him your info, walk away. If he is patient, he can probably find people that will go over you. If he is like most people, he will take the easy route and just sell to you.