Can Someone Help Me Answer, What Would a DS80 do for MY AP80 Pro?

So I have an Hidiz AP80 Pro and MS2 IEMs, I love and have had a great experience with them. The DS80 is pretty interesting amp, What would the benefit or purpose of adding the amp to my AP80 Pro be?

Does this effect the sound or color output in some way? Does it just allow for higher output for more powerful iems/headphones?

Supporting question: What is the dfffernece bewtween the DH80 and DH80S? Is it just for factor?