topping dx3 pro+

Hello, this is my first post here and wanted to ask how much of an improvement is the DX3 Pro+ over the regular DX3 Pro. I've been having this DAC/Amp for about 4 years and it works fine, but I wouldn't mind upgrading to the Pro+. If the upgrade isn't really too much, is there any other DAC/Amp...

I have iems that have impedance of 9.3 ohm. I want to get a dac/amp combo for it - Topping dx3 pro +. On its spec sheet it says that it has output impedance of < 0.1 ohm, but later down the line it also says that its dac measurements are 20 ohm output impedance and Adapter impedance of 8 ohm. My...

I'm about to buy my first headphone dac/amp combo. I have narrowed down my choice to either the Fiio K5 Pro ESS or Topping DX3 Pro+. The cans I'm going to be running from these at the moment are Sennheiser HD560s, HD598, Hifiman HE400se and surely more in the future. But haven't chosen anything...