I posted this elsewhere but applies for the HE6Se too:
For those of you who are on a budget after buying the Susvara and need an amp to drive this beast, you might check out the Emotiva BasX A100 mini integrated amplifier.
The 6.35mm headphone socket on this is wired directly to the speaker terminals. Emotiva includes a bypass jumper switch and instructions so that you can bypass the resistor on the headphone output which effectively gives you 50W per channel into 8 ohms at the headphone output. At 50 ohms this equates to about 8.5w per channel.
It's only a few hundred dollar amp and seems well made, compact but heavy. Internally it is mainly point to point wiring. It has been tuned to sound similar to a 1980s or 1990s amp/receiver.
https://emotiva.com/collections/basx-series/products/a-100