This isnt just audio dealers this applies to specialty stores of high priced items in general
If you enter and it looks like you just want to pay as little as possible the owner might come off as Arrogant.
In the early spring I went to buy a pump for my bike. Just wanted a hand pump you know, looking to spend $20-30 bucks max. This guy had nothing cheaper than $120.. and acted like he was donald Trump and that you were wasting his time. Definitely talked down a lot. I simply took my bike to the gas station and filled up there....
These small shops rely on high revenue/high margin sales and get frustrated when they think you arnt trying to spend "real" money