Do you have a stapedius plastic? If so from my experience most people have some ‘klirr’ (rattle) that increases with volume. I don’t really understand what’s your goal? Do you want to wear the headphones over your hearing aids? Not a good option because feedback control will alter gain especially in high frequencys. Also the sampling rate on hearing aids isn’t on par with hifi standards. Best if you don’t waer your aids when listening through headphones. As far as I know you can even set an different eq for each channel (left/right) on Equalizer Apo since your impairment differs quite a bit according to your fitting gains. Another option is use the direct streaming function so you won’t have too much ad conversion and signal processing. Direct streaming on phonak and Widex is quite satisfying. Just use double domes or closed otoplastics in this scenario. Carry on
There are amps with a built in eq. In fact the perfect combo with the Sennheiser 600, 660s is the ifi zen can with its analog bass boost