How do these compare then to the TI flats or La Bella LTF? I've played both but never Cobalt flats. Any comparison would be great.
I played all of those, including the EB Group III flats (45-100).
La Bella are my go to flats for my P bass, currently around 3 years old or something. Classic, old school Motown thump, big lows, big thump, fantastic with my EMG GZR pup. They were by far my favorite on that P. I use the 760FS( 45-105) gauge set for half a step down tuning. Absolutely perfect tension, feel and tone. Old school all the way.
I wanted flats on my 2 band Stingray, for that 70s flats Ray tone, so I tested EB Cobalt flats, TI flats and EB Group III flats. I always had EB Super Slinky on that bass prior to flats (45-100). EB Super Slinky (nickel roundwound) are my choice of roundwound string for standard tuning - tone, feel and tension wise. I wanted a flatwound that has similar tension, but a traditional flatwound tone. My test commenced:
EB Cobalt flats (45-100) - tension wise, very close to Super Slinky set, nice and flexible. The feel however, due to bigger gaps in windings, is not as smooth as La Bella. It's not a traditional flatwound for sure. Those bigger gaps give it a more modern tone. What I heard was a smooth SS roundwound like tone, which I'm not a fan of. SS roundwounds always sound scooped to me, and too sterile in a way. I tried those for a week, but I wanted a traditional flatwound tone for my Stingray, and those were not it. Off they went.
TI Flats - I already tried those years before on my P bass, and they were too low tension for half a step down for me (my P is half a step down for one of my live bands). On my Stingray, in standard tuning, better. They sounded great. In comparison to EB Cobalts, those had a woody, old school quality, with beautiful mids. I had them on for maybe a week, 2 weeks tops, but off they went. Why? Still too soft and pliable for me. I like keeping the same sort of feel on all of my basses, and these were only good to me for super soft playing. Great sound, fantastic sound, but too soft and flexible for my taste.
EB Group III flats (45-100) - Now those were a surprise. I expected rebranded Chromes. Nope. Those are on par with EB Cobalt flats tension wise, which means - almost just like Super Slinky roundwounds, but they're smooth and they thump! Now, those aren't as thumpy and bass rich and old school like La Bellas, but they felt perfect on my Stingray because they retained a nice balance of lows, mids and highs. I now have them on that bass for around 4 months, and I want them to age further. Right now, they're still very articulate, but they're flats no doubt about it.
Also, I quickly tried EB Group IV flats (40-95) because I thought bigger gauge would have too much tension, but nope. 40-95 was also too soft, and actually less tension than TI flats. 45-100 (Group III) were perfect.
Hope this helps a bit.