https://m.ebay.com/itm/DUNU-3-5mm-to-3-5mm-Impedance-Adapter-Plug-For-Hi-Fi-player-AMP-DAC-Earphone-/380932180092
All you need is a 3.5mm splitter and the adapter in the link above to force high impedance mode. You have to keep the splitter in but you can enjoy seriously loud music on any...