if you wanna use your existing gear with headphones, get a Zynsonix speaker tap adaptor box. depending on your headphones, you can configure the box with a bypass switch i.e. having 0dB (bypass) or whatever level of attenuation you need (if using with sensitive headphones); i have mine with 0dB and -17dB.
a lot of it depends on your gear and how much factory gain they have, as it makes background noise/hum more apparent with sensitive headphones like the Utopia or Grados. the harder to drive headphones eg Susvara, Abyss, will be fine at 0dB through the box.