The oily coating you see is a damping compound applied by the company to make the sound smooth and less edgy or harsh.Cheaper speakers most of the time sound bright and progressing on to a Hi Fi speakers take time getting used to.In the long run you will realize you will get lesser ear fatigue listening to good Hi Fi speakers .
One test to confirm if the tweeters are working all right is to play a blank FM channel with the FM mute released ( FM mode on Mono ). Turn up the Amplifier volume and you will hear a loud hiss ( like standing next to a waterfall ). Turn the balance control towards each speaker and see if they sound identical.
Next remove the grill and cup the dome tweeter with your hand with out touching the dome itself to block the hi frequency sound, it should sound dull. And when you remove your hand should sound hissy and sharp.Try to do this with the balance control turned towards your speaker.
Sound is very subjective and personnel like taste, don't let anybody talk you into deciding which is better for you.
Testimonial: "Very quick response! Quite insightful answer leading to deeper understanding of the problem. Thank you!"
Thanks a lot for the swift answer!
Even before to try the test you suggest with the noise from the tuner I could confirm the performance is not affected. I can perform the full testing though as my AV amp doesn't have balance control. Anyway both speakers sound identical but I will switch places to confirm this once again.
Problem is that the left side tweeter have leaked ferofluid and I am concerned it was abused and overheated. Would that mean it might fail sooner than later? Or can I relax and use my speakers at the moderate levels I usually do?
I guess if driven hard for long periods this speaker might have problems and overheating of voice coil may cause damage to the tweeter. Or I am wrong?
If the tweeters are sounding OK now and you intend to run it at moderate volumes , I promise you nothing will happen to it. All modern tweeters have a fluid called ferro fluid between the voice coil and magnet. Its a damping agent as well as a coolant. Its allows the tweeter to be abused to an extent , heat from the coil is dissipated to the magnet. It was invented for NASA but even they never thought what a Heavy metal fan could do to a tweeter at high volumes !!!.
If you intend to keep the speakers for good, to put all your worries aside and get benchmark performance get the tweeters replaced, it might be worth it. All the best
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