@ljnew : I know it's UM Pro series thread where lately UMPro50 discussion has been a hot topic, but since you made quite a bold statement about W80 having "awful" bass and brought up ATH-CKR10, let me stay on the topic of your statement to discuss it further
Do I know CKR10? I was one of the first reviewers who introduced head-fiers to CKR9 and CKR10 in my write up over 2 years ago. So, I'm quite familiar with it
We all hear things differently and have our own personal preference. Just because one person likes one pair of IEMs over the other, doesn't mean it makes one superior or better. It's just that, a personal preference. And every manufacturer tunes their product differently. Sometimes it has to do with limitation of the drivers, while in many cases it has to do with a vision of sound engineer behind the product line and how he/she interprets the sound, thus choosing the right building "driver" blocks and cross-over cut-offs to get to the final tuning. And just because you think the bass is "awful", it's your personal opinion based on your personal preference.
Look at this quick measurement chart between W80 and CKR10 (Veritas raw data, and my setup is not fully calibrated, but sufficient for relative comparison). Green - W80 FR, Red - CRK10 FR.
W80 has actually a stronger mid-bass, but overall a more balanced tuning. CKR10 mid-bass doesn't have as strong punch, but it has a deeper sub-bass extension (Veritas can't capture accurately below 50Hz, but I hear CKR10 having a deeper sub-bass rumble). The big contrast here is valley in CKR10 lower mids and peaks in upper mids which makes signature almost mid-forward and has more contrast between the bass and the upper mids due to scooped out lower mids. An evenly tuned W80 with fuller body lower mids will give you a more coherent signature with a smoother flow from bass to mids where bass has a different definition in comparison to CKR10.
So, regardless of if you have 8-BAs and the size of its bass drivers you still get a nice low end punch, or if you have 2-dynamic drivers in push-pull config with a carved FR to separate bass from the upper mids - you are just looking at two different sound signatures, two different types of drivers, two different technologies, and two different ways of tuning the drivers where some people will prefer one vs the other. Doesn't make one better than the other, just makes it appeals to different people.
Not sure if you purchased and returned back W80, or just demoed it somewhere else, and/or how much burn in it had since Ken's Ref8 cable does improve after about 100hrs of burn in, but either way it sounds like W80 is not your cup of tea. That's all. Enjoy CKR10.