Level matching for a/b testing?

Yeah that's the story. I guess starting out we all need whatever extra we can find. Probably play the same track over and over again too I bet. None of which is necessary- and for as long as it is, this alone is saying you are not there yet. Think about it. If you are so easily deceived, it can only be due to not being aware of the volume difference. If you are unaware of the volume difference, then what else are you missing? And you are gonna rely on what, a meter? To make up for what you can't hear? You see how little sense it makes?

db meter, or app on your smartphone

https://www.dagogo.com/audio-by-van-alstine-abx-comparator-review-part-1-audio-store-wiring/

^^^^ is a very useful tool... but a little pricey 

@millercarbon I hope that the overwhelming majority of your other 8324 posts are less condescending and more instructive than this response. Otherwise, why do you bother?