I don't think there is anywhere in the USA where there is a concentration of shops.
The Best City to audition High end and Vintage Audio
Seoul is the best place to audition high end and vintage audio.
There are three places that I can recommend.
The first one is Yongsan Electronic Center which used to house more than 100 audio shops but only 50 remaining now.
The second one is I-Park mall located in Yongsan train station which is 1 km away from the first one.
The third one is Seocho Electronic Center which houses around 30 audio shops located in Gangnam District(Gangnam Style)
https://youtu.be/9bZkp7q19f0
https://photos.google.com/share/AF1QipMtNSB4H5MbCvLRW_yUOEOl3WRBxcf--Jdo_iBJFwEeTH1i-rg4WsWWn5tp03-W1Q/photo/AF1QipMt44zSIw0NovqUoZCHdqHa1CNu4zUSEYxdXFKu?key=VjN1SHRiUWYxUGd0dk5qWTVQOEJNNXdMaEZ0RGZB
Above photo is a vintage shop in Seocho Electronic center
There are three places that I can recommend.
The first one is Yongsan Electronic Center which used to house more than 100 audio shops but only 50 remaining now.
The second one is I-Park mall located in Yongsan train station which is 1 km away from the first one.
The third one is Seocho Electronic Center which houses around 30 audio shops located in Gangnam District(Gangnam Style)
https://youtu.be/9bZkp7q19f0
https://photos.google.com/share/AF1QipMtNSB4H5MbCvLRW_yUOEOl3WRBxcf--Jdo_iBJFwEeTH1i-rg4WsWWn5tp03-W1Q/photo/AF1QipMt44zSIw0NovqUoZCHdqHa1CNu4zUSEYxdXFKu?key=VjN1SHRiUWYxUGd0dk5qWTVQOEJNNXdMaEZ0RGZB
Above photo is a vintage shop in Seocho Electronic center