First off, I'd like to thank @atomicbob for providing his usual set of comprehensive measurements, some still in progress: https://www.superbestaudiofriends.o...ite-mk4-technical-measurements-dac-only.9392/ I believe most of you understand by now that taking measurements in a consistent, repeatable, and comprehensive matter is difficult, time-consuming, and draining. This especially so when there is weird stuff that warrants investigation, which seems to be more today with modern measurement gear that can detect 140db SINAD, which is 10,000,000 to 1. The measurements that I typically provide aren't anywhere as comprehensive and regimented as @atomicbob's, but those still take two days to complete. Odd behaviors (identified based on experience), could indicate human error or error caused by external factors, follow up. I can't speak for @atomicbob, but these things drive me nuts and add a few more measurement sessions throughout an additional week. The way I am going to approach the UltraLite mk4 is from a headphile and working-from-home perspective. The Ultralite is a computer interface with multiple inputs, multiple outputs, internal routing, mixer, DA/AD, and more. It's a viable alternative to the RME ADI-2 Pro (remember when it was FOTM). I only wished that someone had brought this piece of gear forth as a much less expensive alternative with a different sound. @Psalmanazar has mentioned this, but the RME's FOTM had already passed by the time he did. RME has released a DA only version with an IEM output to cater to audiophiles at a much better price point. The quick takeaway is that the Motu Ultralite mk4 is the bees-knees best-thing-since-sliced-bread at an affordable price point of $700. It does everything we can possibly imagine and more. Again I will focus less on the musician aspects of the Ultralite and explain what the Ultralite mk4 can accomplish for audiophiles and folks working from home. DAC Converter: see below Microphone preamp and AD: https://www.superbestaudiofriends.org/index.php?threads/motu-ultralite-mk4-review.9438/#post-304776 Instrument input and AD: https://www.superbestaudiofriends.org/index.php?threads/motu-ultralite-mk4-review.9438/#post-304776 Impedance measurement: https://www.superbestaudiofriends.org/index.php?threads/motu-ultralite-mk4-review.9438/#post-304779 Audio analyzer: https://www.superbestaudiofriends.org/index.php?threads/motu-ultralite-mk4-review.9438/#post-304779 Three-band parametric EQ: https://www.superbestaudiofriends.org/index.php?threads/motu-ultralite-mk4-review.9438/#post-304781 USB to SPDIF conversion: https://www.superbestaudiofriends.org/index.php?threads/motu-ultralite-mk4-review.9438/#post-304782 Other Stuff (sampling rate, 0dbFS, lowering output for IEMs, headphone output, digital filter, USB):: https://www.superbestaudiofriends.org/index.php?threads/motu-ultralite-mk4-review.9438/#post-304787 DAC Converter The Motu Ultralite Mk4 serves as an excellent DAC. Does it play with the big boys? Not quite. However, it's got an really interesting sound that belies its ESS Sabre 9016. Larry Ho at LH Labs was often lauded as the Sabre-whisperer with the Geek Out version 2 (GOV2) portable DA dongle, but the guys at Motu may yet deserve this moniker too. (LH Labs went down in flames, but that's another story). The GOV2 was very warm sounding and even gentle in the highs, but its strengths lay with its fluid sound and ability to rendering microdynamics or PRaT that would suck the listener in. The UltraLite Mk4 (ULmk4) retains these strengths, but offers IMO what is a more agreeable or easier to pair tonal and timbre qualities. The ULmk4 is warm, but it's not typical warm context, as in an emphasis in the upper bass or lower mids. It's an all enveloping warmth that covers the entire audio band. The warmth is inherent and cohesive throughout. Think tube warmth, not 300B but 45 tube. The headstage is deeply placed. Localization precision is good. So is layering. It's not TOTL, but it's very good where I would even place the headstage on par with the X-Sabre Pro (a head-to-head would be interesting). The high-end transients is typical sigma-delta with a hint of Sabre, but no more annoying or possibly less annoying than the XSP. Compared to the AKM Velvet Sound DACs, the most immediate difference to me was the headstage. The other things that folks have complained about with the Velvet Sound DACs as still there with those DACs, but the staging was the biggest difference. I generally find the AKMs to headstages wider in relation to deep, and too diffuse. To see where the MKmk4 subjectively stands in comparison to other DACs, refer to this: https://www.superbestaudiofriends.o...view-and-measurements.9379/page-5#post-304208 Note that the outputs are balanced TRS jacks. For balanced output, we will need stereo TRS to male XLR cables like this here. Note that I do not recommend adapters because of lack of real-estate on the back panel. For single ended output, TS (tip-sleeve) to RCA cables will be required like this here. Don't get Monoprice cables. At one time on CS they were recommended, but discovered to be too cheap with too many corners cut. We can also get cables at Guitar Center. I actually love the Guitar Center cables: perfect fit and flexible - not this retardo audiophool shit that fits too tight and isn't flexible*. Finally, the TS plugs will short "-" and ground pins that to go the XLR, but the ULmk4 handles this just fine. Please be aware of this to avoid magic smoke when using "cheater" cables to convert balanced to unbalanced with other gear: https://www.superbestaudiofriends.o...o-unbalanced-input-a-brief-visual-guide.7012/ Note that in the photo above, I am using four of the ULmk4's output channels for simultaneous BAL and SE outputs! The possibilities are endless! The ULmk4 has a nifty routing interface that is accessible from the web UI: We can see that I'm routing Computer USB 1 and 2 (L and R) to Main 1/2 and Analog 1/2 outputs. I can't say that I am a big fan the input/output matrix. I would prefer a map, a visual diagram of the routing like on the Metric Halo ULN series. But keep in mind: $700 vs $2200+. *people who make music don't have time to fuck around with audiophile shit. cables are the last thing they want to worry about.