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L150 with curious woofers turn out to be 128H with black coating on back of cone
I removed a Low Frequency Driver from one of my L150 speakers to identify it. I have been curious as to why it doesn't have the white coating on the front of the cone like other L150s do. I was concerned that a previous owner had substituted non-JBL drivers.
What I found was that the driver is marked JBL, 128H, and has a serial number. It looks like an original JBL, not rebuilt. It looks very clean, almost new, although I have owned the speakers for 15 years or so.
I feel relieved that they are original JBL 128H drivers, or at least this one is and I am assuming the one the other speaker is like this. But, there is still a mystery about why these are installed and not the white coated 128H's.
I have read these were used in some of the studio monitors, and that they are identical in performance to the 128H's with the white coating on the front. Maybe it was a substitution at the factory, due to inventory or something, or maybe some previous owner swapped the white coated 128H's out for the black coated 128H's at some point. But, I am just glad that they are original JBL 128H drivers and they are in such good shape.
I will try to attach a short video of the back and front of this driver. I will also attach some photos in case the video does not work.
I have been looking for replacement 033 tweeters on eBay and found a couple for $60 each, that are used but look real good. If you know of other sources, at lower prices, please let me know. I don't know what a reasonable price is.
Thanks to those of you who responded.
Maybe someone else will have some of these black backed 128H drivers and this thread will help them.
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