Just in case future travelers to Taipei would refer to this thread:
- I confirm that Syntrend and Guanghua are worth visiting ASR nerds, not just for the headphones shops, but computers and electronics in general. These electronics malls are side by side and you can visit both in one day. Just search for Syntrend and Guanghua on Google maps.
- I also discovered a home audio street: Kaifeng St, Zhongzheng District, Taipei City. The street has several audio and headphones stores. Nothing too esoteric though. I didn't event see any store selling Topping.