The only way to keep the sound intact is to use low output impedance (~<1 Ohm) sources. A lot of sources will specify a headphone impedance range that starts with 16 Ohms, but the Andromeda goes down to 4 Ohms in the bass region.
I prefer the more “studio monitor type sound” at 2 ohms than the warmer <1 ohm sources since I use my Yamaha HS7 speakers as my reference. At 3 ohms or higher, it sounds too analytical and edgy and bass becomes hollow