A little bit of apples to oranges, given that the DX7 Pro is a DAC/amp combo and the Monoprice THX 887 is just a headphone amp. That said it's easy to do the comparison on your own: just look at the amp measurements (just below the DAC measurements) of the
DX7 Pro and compare them to the amp measurements of the
THX 887.
I don't know what your definition of "extra execution" is but when you do the comparison you'll see that:
- The Monoprice THX 887 has noticeably better SNR.
- The THX 887 has more power.
- The THX 887 has excellent output impedance (1.4 Ω) while the DX7 Pro is a bit disappointing at 6.2 Ω.