Along the same lines as Blindjim... I like to send emails , from the manufacturer's own website , asking questions about their product of which I have an interest .
Sometimes I get an answer within minutes or hours . I consider them a good company that I would do buisness with . Some of these will even suggest that you call them and discuss what it is that you are seeking to acomplish and offer advice that will help , whether it would be their product or not . I am refering to those at Quicksilver , Upscale Audio , Granite Audio and Merlin .
Sometimes I have to send a second or third email before getting a response . A bit ify but a possiblity depending on the follow up correspondence .
And sometimes , after 3 email attempts , I don't get a response . I figure that they are busy with their current customers and don't need new ones !
I can't appreciate the good ones without experiencing the bad ones !
Good luck .