Your crossover into the tweeter is at 2.9KHz. Try an online tone generator at 2KHz, and at 5Khz (Turn your volume way down, set the 2KHz, then turn the volume up until it is clearly audible but not too loud, then try the 5Khz)
If the tweeters are blown you'll be getting very little sound at 5Khz.
Try setting balance fully left and fully right to test each speaker in turn.
You might need to try some freqencies on either side of 5Khz (I'm deaf at 6KHz due to tinnitus). Also worth trying this with your other speakers first to hear what the two tones should sound like. Your ears are less sensitive at the higher frequency so it'll sound naturally less loud even at the same level.
Online tone generator
EDIT : To get a little more objective, get an SPL meter on your phone. Measure the output of the speaker with this at the two frequences. Repeat with your other speakers. (Keep the speaker to phone distance constant throughout)