Lohb
Headphoneus Supremus
There are very small dongle-sized custom tailored line-level hardware EQ units that go between DAC and amp that can be had from the more DIY oriented/modder audio hardware forums.
Can spin any can towards flat-line monitor FR or Harmon Kardon curve without artifacts getting in signal like digital EQ can cause.
Can spin any can towards flat-line monitor FR or Harmon Kardon curve without artifacts getting in signal like digital EQ can cause.