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I never seen the polyethylene drivers but I would not say that it would be a joke, I would rather say that I have no idea what to expect. The SL600 MF driver is a polyethylene-like driver and it does have some interesting qualities, Sure it you drive it under 120Hz then the SL600 MF driver begin to sound like shopping back trembling from wind gust but above it does very nice. There is another consideration why I would not consider a polyethylene driver as a joke. With my horno-snobbery I hardly see a driver as a potential direct radiator but I see them only a candidate to be horn-loaded. There are absolutely no rules of prediction what will happen with sound when a driver is horn-loaded. You can put a farting porcupine in the throat of a horn and it is suddenly might throw a good tome out of horn, I have seen it, so go figure…

Regarding the Eighteensound 6.5"driver – it looks good, however I have some concerns. You see, the Eighteensound driver is a pro driver that made for higher power handling – it is never good and there are a lot of reasons why. There is another aspect. Those drivers have the cone treatment that makes the cone suitable to work outdoor in moisture weather conditions. Usually it is done with different propriety treatments; all of them impregnated rubber-like minerals into the body of the cones. Those rubber-like deposits are not good for sound as they overly dump the cones… There is a catch however. If you buy 30-40 years old Altec, JBL, Vitavox and so on cone drivers, that mostly had the similar impregnation then the rubber-like mineral are faded away and become less contributive. Those “dried out” drivers as VERY sensitive to moisture outside but they do have way better tone then the “new” cones.  I made some experiments in past, comparing the 30 years in air good cone driver and reckoning then with identical original come that was sitting for 30 year in a sealed plastic back – the difference was VERY notable. You do not need to listen the driver and can juts scratch them with you nail – you will immediately feel the “dryness” of the cone…

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