Even harmonics ??
Both drivers are more than adequate for hifi at Home. The 18Sound is obviously without major shortcomings, except it's 6x more expensive than the Oberton.
As far as 10-20k is concerned, there's no escaping an 8-10 dB nosedive. The same applies to the 4" Radians.
what are the model of these drivers and where to buy at a cheap price in europe?
This is hard to say, because the drivers are technically quite different.
The Oberton drivers are rather straightforward "classic" compression drivers with "high-tech" diaphragms, whereas the 2430 is more akin to BMS' dual annular diaphragm (ring radiator) technology.
The 2430 is hard to come by and significantly more expensive.
From a technological point of view, I prefer the less complicated single dia compression drivers for hi-fi, which is not to suggest the dual diaphragm drivers are ill-suited for hi-fi duties.
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True, that came out wrong I was meaning expensive for a driver of conventional materials. And with the world upside down and exchange rates in flux, pricing of anything is quite variable at the moment.
The new TeXtreme Eminence N341-X just came in from parts express the other day and after 2 days listening they are performing stunningly in the JBL 2384s down to 490hz. That’s with miniDSP 48/@ 490hz is a real sweetheart! 30 years of speaker building and this is the best I have had yet! Im not jumping on the hype train. I’m just saying they are worth a look.