What kind of listening chair

If you can buy local, and support small business.  Most of the best restaurants are local and do not have a drive up window.  But if you don't support local business, you will only have mainstream chains to shop and eat at....what joy. 

Just went from the Ikea Poang to a Stressless recliner. Much more comfortable, especially during longer listening sessions, but I can't say it changed the sound any.

A Danish designed recliner by Hjort Knudsen is spectacular between my Moabs. 

It wasn’t the most comfortable, but for superior Sonics, I found a dining room chair to be the best. Shoulder height back with arm rests. Nothing to deflect the sound on the sides.   Superb

Whatever you use, don‘t let it be above shoulder height.
Also height should provide good allignment with the tweeters.