I understand the feeling having an external amp gives a person. Believe me sound i perceived better with one, but they are not needed with high sensitivity speakers. You have a 97db 1 watt speakers. Which means at 2 watts you have 100db and around 8 watts you have 106 db this gives you THX reference volume. Now for every meter you are sitting away from the speakers you will want to double the wattage for THX reference peak volume.
16 at 2, 32 at 3, 64 at 4, 128 at 5
This assumes you like it cranked up.
If you listen at normal volumes.
You would need only 90db peak volume.
This is about 0.25 watts
Double by 2 for every meter beyond 1 meter
0.5 at 2, 1 at 3, 2 at 4, 4 at 5, 8 at 6, 16 at 7, 32 at 8, 64 at 9, 128 at 10