original post was perhaps unclear. making an edit. My question is whether it would be sufficient for the ER4S or if I need to go with the ER4P as seems to be the pairing I see most on the forum.

Edit: placing edit here due to lack of clarity in title. I know the Fiio pairs well with the ER4P. My question is if it also pairs well/has enough power for the ER4S too. I ask this because 1) the ER4S has a much lower impedence, 2) it's preferred since rated as having better accuracy and...