Hey, I just got a pair of CX300 a while ago. I think I can help you out, I will just measure mine. BTW I think the bass is amazing and very powerful. I didnt have to break them in much and I didnt notice much of a idffernce when i did. Did you try pushing them in farther or choosing the proper size rubber part? You really have to make sure they are stuffed in far to get bass, when you do the bass is magnificant. Ok, I measured them, from the end (not including the plug and the handle of the plug) to the part where it splits... its around 87 cm give or take a couple.
Split to right--- 50 - 52 cm
Split to left--- 15 - 16 cm
Hope that helps
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