Modi 3 is very similar to the RME and if they put ever put Unison in a Modi 3+, it will be awfully close. The RME bass is tighter, but generally the Modi 3 and RME I'd put in the same sub-family of sound (add SDAC). In other words, Modi 3 is an RME ADI2 lite from a purely sound POV. Modius on the other hand is a radical departure from Modi 3 / RME ADI2 sound, specially from the XLR outs. The SE outs on Modius are phat, but the mids are present and have some real kick like the Modi 2 Uber based on the prior gen AKM chips. Modius and xDuoo XD-5 are in another sub-family. Bass textures seem to be a real challenge regardless and RME ADI2 pulls this off better than the rest. Filters make a difference, but they don't suddenly change the AKM4490/93 into the prior gen AKM4399 nor do they have the same result as a totally different output stage. Personally I dislike all the slow filters built into that chip, but then again I dislike all slow filters (and minimum phase) in general. Cranesong Solaris still has that mush, it's just less evident because the presentation is tuned to be more clinical. Topping D70 and Solaris belong in another VELVET sub-family with a leaner and brighter presentation. Except the D70 doesn't have Solaris' soundstage / custom-filtering and resolves plankton no better than the $79 SDAC. P.S. I don't know how the heck that guy on Gearslut took that long trying to figure out Convert-2 and Solaris. They are totally different.