Manufacturers must have the basic courtesy of speaking politely to a potential customer. It just doesn't make a difference if the headphone / IEM / DAP / DAC / AMP etc cost $10 or $10,000.DCA was one of the last rooms I went to and I saw device swapping throughout the day at most tables. There's a difference however between asking a potential $4,000 customer to not use their own device and yelling across the room, coming off like a huge asshole when I apologize and then while standing next to me, yelling at the room not to do what I just did. Combine that with the slight to the older gentleman with the CD + the other stuff in the thread, it seems like the problem is on DCAs side. Comparing that to the experience at ZMF is just night and day. My wife and I walked in and Zach's wife was so sweet and offered stickers that she personally put together, the crew helping with the setups were active, friendly and caring. Maybe another experience in the future will change it but for now I won't buy DCA out of spite. Meanwhile, I feel a loyalty to ZMF and damn near felt guilty that I didn't grab an Atrium Open and opted to wait till November for their new stuff.
If a manufacturer doesn't want listeners to swap gears without their assistance, they ought to put that in writing and display it.
I don't think that anyone is desparate to fiddle with an equipment or mess with it as most audiophiles are quite careful and understand how to swap products.
Bad attitude has no cure!!