If you were to market a product, what would you do?

Get some beta testers who are online a lot to spread word of mouth. Perhaps see if any pro reviewers will review it. And find the kind of dealer that trusts their own ears rather than marketing to see if they will champion it. That's what comes to my mind and yes audio clubs are also a good idea.

Europeans often are more open to new things, Americans tend to be more conservative. I would try to involve them too.
What product are you talking about? Cables and speakers might require different approaches.

Beta testers as @jond suggests, is certainly one avenue, though this is more common with items that are easier to ship, and less susceptible to damage from shipping, like cables.
For larger items, perhaps asking if you could host at some audio clubs could also provide some feedback, or stimulate sales.

Peter, you might try giving Bob Backert of Backert Labs a call, as I'm sure that he would have more developed ideas. He has launched his own brand after many years of providing repairs and upgrade service for many big brand name electronic gear.

Good luck,
John

My partner and I are building Direct Heated Triode DAC and preamp.  We also build a phono stage.  These are hand built, point-to-point wired with customer transformers and the best resistors, capacitors, etc.  Power supplies are about 30 lbs., each.  I have had a few people in the industry hear the products and one local dealer.  So far as we bring the products to each individual it has taken only 30 seconds to hear how our products perform and that has resulted in immediate sales.  I have had offers by these people to take out products to the audio shows but we were really not ready then.  The past eight months were spent on a new chassis where we could have just one power supply for the products and helping us to be able to make the products easier to produce.  Dealers may be an issue because I have to increase the price to allow for dealer mark-up.  I am working on attending a show with a speaker manufacturer who has already heard the products.  I am thinking that I would like to start out by having a few manufacturer reps in a few areas within the US.  I am working on a person in the northeast.  As far as Pro reviewers you really have to basically pay for the review and I would have to provide an industry accommodation price as I don't expect to get them back.

Any other suggestions?  I am all for input.