You missed a couple of things in this thread ...
The knock off driver doesn't work well, that's the reason for this thread. And the fact it does not perform well delights me! The fact that someone (ivica) bought them unknowingly and in reality has been cheated sorrows me.
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I don't think I missed the fact that the "knock-off drivers" do not perform to JBL specs - surprise, surprise.
To me, the fact that the buyer was ripped-off is sad, however, some here might have missed the BIG picture. Someone went to the trouble to make a fairly exact copy of one of the best compression drivers on the market and that was done for a reason. My guess is that they did so to obtain manufacturing knowledge so they could eventually design their own drivers and compete in the marketplace with Harman.
I'm not an engineer, but I assume their shortfall in the knock-off was that they failed to copy the OEM phase plug exactly. Wow, I wonder how hard that would be to correct?
These drivers have been out of production for a while and the knock-off copies are not new either, so this indicates the "knock-off "problem" has been with us for a while. If I were Harman management, this would scare the cr@p out of me!
Most knock-offs like shoes, handbags, sports clothing, jewlery, ect. are made to undercut the seller/manufacturor of high-price luxury items. Considering these drivers are mostly used in professional installations like movie houses and sound reinforcement, I doubt that this was done to undercut JBL and that is why Harman should be very concerned.