关于JBL2404超高音的振膜

家电火炬手 · 发表于 2011-7-6 13:19

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发现JBL2404有两种振膜，一种为铜边的（国内常见），一种为铝边的，不知道声音有什么区别

看了国外烧友评价：

Help with 2404 diaphragm

Greetings all,

Been doing some experimenting with the 2404 & have acquired 2 pairs of 2404H's with unknown history.

On careful listening both pairs have a distinctly different sound, so out with the tool kit to check out the diaphragms. 1 pair has the diaphragm as per attached pic, whilst the other has an all silver diaphragm.

Have done searches here & elsewhere to try to determine the difference & from what I have come up with, the frams with the gold surrounds is to suit the 2404H which allows the driver to be crossed over at 3.5K & handles more power, whilst the all silver one is for the driver that must be crossed at 6 or 7K & handles less power? I prefer the sound of the all silver diaphragm & would like to source a pair of these. My dilemma is that most of the companies selling the genuine JBL fram seem to have a goldy type coloured surround as per attached pic & not the all silver type.

Do you think the two types of frams I have are genuine?

Is the colour of the inner & outer ring of the available genuine frams irrelevant?

I should describe the differences in sound quality.......the all silver frams are cleaner, clearer, more transparent & on the whole, have more clarity. The gold surround types don't sound bad, it's just that the all silver ones have a beautiful transparency to them.

Thanks for any advice,
John

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Here's the pic of both diaphragms. I don't have a mic to measure the phase plugs,but by my reckoning they are not the 1.715 inch diameter but rather they are both 1.6 inch.
Crossong these over at 6K @ 18db.