I have heard 650 bass with a bit of delay, and a bit of veil. 650 depends on the source chain having a tight control over the drivers. This is why there are differing opinions, it's not just difference in hearing. Some people probably have the chain to hear it perform better. This is why I keep my 6XX. It can sound a bit warmer, veiled, and bass loose with delay, or not. So, if Verum sounds like 650, that could be good for those think 650 sound good.