@loomisjohnson thanks for your help but those Klipsch X5 IEM's just aren't for me. I gave them a fair chance for a second day at work, with a pair of large Spin Fit tips. Surprisingly these did increase the treble clarity and dynamics somewhat, but I still found these so muddy / boomy / non-detailed that I couldn't even stand to listen for longer than 45 minutes, even in a noisy factory setting. I'm certain I had a snug fit, but sometimes the sound was so lackluster that I couldn't even understand vocals from those.
OTOH I still have my RHA S500, which are less than 1/3rd the price with clarity, dynamics and overall resolution enormously better, not to mention greatly superior build / cable quality. I may recommend you to try those instead. I was looking elsewhere in hopes that I could get something with better isolation since all the bass was being drowned out by the background noise (even with large Comply foam tips), so on 2nd thought I wouldn't mind a recommendation for a long narrow shaped earphone - or universal fit - that is somewhat bass heavy yet detailed / clear and well isolating...
OTOH I still have my RHA S500, which are less than 1/3rd the price with clarity, dynamics and overall resolution enormously better, not to mention greatly superior build / cable quality. I may recommend you to try those instead. I was looking elsewhere in hopes that I could get something with better isolation since all the bass was being drowned out by the background noise (even with large Comply foam tips), so on 2nd thought I wouldn't mind a recommendation for a long narrow shaped earphone - or universal fit - that is somewhat bass heavy yet detailed / clear and well isolating...