Nope, not Audio King. Okay, okay, I'll spill.
The stereo store on Lake and 3rd Avenue South was "The Sound Of Music". That was their first store, then they opened another one on 66th Street across from Southdale, the first shopping mall.
Later, they changed the names of all their stores to...wait for it...BestBuy. Now, I wouldn't buy anything there.
Southdale, which opened in 1956, I believe, had a PA system that was all Altec-based. I had two of their 1569 amps for awhile, when they upgraded their PA years later. I had to have the 70-volt transformers disconnected.