Not much—and quite a lot! First of all, rest assured it sounds fantastic. There is no sonic difference between HS-A02 and HS-A03. And the price remains the same too! How often do you see that in 2025?
Then why did we make a new one? Well, a few things were bothering us. We weren't too sure about the vertical locking pins we used in the HS-A02. So now it's a precision German stainless steel cutting. It spreads the locking force better, holding the headshell even tighter in the connector.
And we listened to all the Technics turntable owners who loved the HS-A02, but just could not lower the tonearm enough to get it precisely horizontal with some cartridges. Now you can! HS-A03 mounting surface is 1mm lower.
Last but not least, we felt the looks could be refreshed a bit. Just enough to tell the HS-A02 and HS-A03 apart. Hope you like the new design!