Correction. " one of the panels start to buzz and make audible popping noise after they have been turned on for 30 minutes or more"
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The thing is one of the speakers is working fine but the other one seems to be faulty. I could still play my music if I just ignore the soft buzz and pops but will it get worse and affect all the other working panels.
Should I replace all the panels of both speakers or just the faulty ones if I don't want sound quality to be compromised .
Your readings are really low (really dry)
One of my Wayne Picquet 57's a couple of years back in higher humidity started to make a crackling sound that would cycle on and off. It would make the noise for about 20 seconds and stop. And repeat.
It could be heard between songs if 5 or 6 feet from the speaker. It did not affect performance.
In talking with Ken at Electrostatic Solutions higher humidity is to be avoided. This is especially true for the 63's the most vulnerable. The 57's are very hardy compared to them. Not sure of its effect on 2905's.
Now whether the humidity being too low can also cause any adverse effects I don't know. Maybe someone else can chime in.
I keep the humidity around 50'ish or lower in winter and no symptoms anymore.