Will, I can't speak directly to those amps you list but I do use one of those Chi-fi cheapies in my bedroom system, which is this one:
https://www.amazon.com/APPJ-mini2013-Original-miniwatt-Amplifier/dp/B00JSNLT28/ref=sr_1_fkmr0_2?s=el...
I might be made by Gemtune also. It's only 3 watts and I use it with my 101db efficient Zu speakers. I will say this, in a small room it sounds as good or better as any other amp I have owned, and that includes a few multi-thousand $$ amps. I've been using it for about 3 years with no problems. And if it breaks I will probably just buy another one for about $130.
So if one of those you listed interests you, I say go for it. Only caveat is your speakers. I did use mine to power some 88db B&W towers for a while. It worked but the sound was nothing special. You might be ok on your 91db speakers but you'll have to try it and see.
https://www.amazon.com/APPJ-mini2013-Original-miniwatt-Amplifier/dp/B00JSNLT28/ref=sr_1_fkmr0_2?s=el...
I might be made by Gemtune also. It's only 3 watts and I use it with my 101db efficient Zu speakers. I will say this, in a small room it sounds as good or better as any other amp I have owned, and that includes a few multi-thousand $$ amps. I've been using it for about 3 years with no problems. And if it breaks I will probably just buy another one for about $130.
So if one of those you listed interests you, I say go for it. Only caveat is your speakers. I did use mine to power some 88db B&W towers for a while. It worked but the sound was nothing special. You might be ok on your 91db speakers but you'll have to try it and see.