Muddy mix

[undadogz]

Hello not sure if i am allowed to post this here but i have been struggling a bit with translation poor headphone quality
at the moment i am using
mac pro 12 core
3x digi 192 audio and digital outs
1x ssl sigma
1core pcie 2accel
Yamaha Hs 5
Digi control 24

Headphones i have coming aux out ssl sigma via db25 to 8 trs only using 1+2 into mackie hm 800 headphone amp then hm 800 outputs x8 to patchbay in then headphones are directly connected to the patchbay outputs is this correct setup ...it works but sounds very muddy ? i use to come me out of the control 24 aux send but same problem
very muddy ...
as for the translation from mixing monitors to car speakers sound great but i struggle with any other format very bottom heavy and mid i have adjusted the db + - to see if it helps on the monitors but still struggling i have put a little no to a example hope that is ok if not then i will delete the link ...many thanks for any advice
https://youtu.be/YS51XnhRVdY