how do you test volume levels for viewers?

not like how do you do it, but how do YOU do it? through recordings? do you do it live and make sure a few people are there?

for those that do it through recordings, how does this help? cause it makes no sense to me cause i feel like how it sounds depends on how low or high your speaker volume is set, so it doesnt make sense how youd know it it was a good volume for viewers?

do you first set your speaker volume at a good level for you and then go from there?

cause when i watch some of my vods back, the game volume seems VERY low, but then i turn up my speakers a tad and its good..? or i adjust the twitch volume and it sounds good. i know viewers can do this too, but sometimes the game volume is low but if they turn their speakers up the mic is WAY too loud. ive experienced this several times on other streams. oh and there there is the volume in your media player when your watching your recordings back, it may seem low or high based on that. so im very very confused on recordings help.

anyway, just want to hear from others what techniques they try that im not thinking of.