Rockna Wavelight - Holo Audio Spring2 KTE listening evaluation All evaluation performed with the following setup conditions 1) Dante Digital Data Delivery System to DAC AES inputs 2) 88 KHz sample rate to DAC AES inputs 3) JRiver SOX SRC used to homogenize source material to 88 KHz sample rate 4) NOS filter used on each DAC 5) DAC outputs level matched to within 0.031 dB 6) listening levels 70 dBSPL average with 80 dBSPL peak at headphones 7) Genelex Gold Lion 300B tubes used in Eddie Current Studio B 8) Studio B adjusted for 0 dB gain input to output 9) levels adjusted with Goldpoint SA2-47 stepped attenuator 10) listening room ambient SPL level observed at 26 to 30 dBA; 38 to 42 dBC setup interconnection diagram Note: ABX is inserted between the DAC outputs and the Goldpoint SA2-47 ABX listening station Calibration Prism Sound dScope III used to adjust levels signal generator set for 0dBFS 1KHz to AES output at 88KHz ABX level matching setup ABX level match results Rockna Wavelight level match Holo Audio Spring2 KTE level match Matched to 0.031 dB in Left channel Matched to 0.024 dB in Right channel Source material used: Brad Mehldau - It's Allright with Me Canadian Brass - Purcell Trumpet Tune Gary Stroutsos - Forgotten Seas Ray Bryant Trio - All Blues Brad Mehldau Trio - It's Alright with Me - Brad Mehldau Trio Michael Gettel - Summer Rain Blood, Sweat & Tears - Blues - Part II The Beatles - Blackbird John Hammond - Get Behind the Mule Steve Treseler Group - Foxy Trot Taj Mahal - Mind Your Own Business Blind ABX testing used to confirm ability to discriminate differences between DACs The results are shown below During the first run (training) challenge step 5 was not correctly discriminated. The two successive runs were perfectly discriminated. Commentary At this extraordinary level of performance Wavelight and Spring2 KTE sound more similar than different. Please keep in mind the differences described below are subtle but differentiable as demonstrated in ABX testing above. Differences observed 1) Leading edge of kick drum exhibits greater impact with Spring2 KTE 2) Spring2 KTE upright bass presents with greater richness 3) Wavelight has enhanced clarity in the 100 to 300 Hz range on dense passages 4) 300 to 3000 Hz the DACs sound fairly even in presentation 5) Above 3 KHz Wavelight presentation is brighter 6) Saxes and brass have more bite on Wavelight. Some may prefer this enhanced bite. I was in the studio with the Steve Treseler Group and heard Steve's tenor sax along with Ingrid Jensen's trumpet. To my ears the Spring2 KTE renders the recording more closely to what I heard in the studio (Some of my mics were being used on the project.) Conclusion These are two very fine DACs. I have a slight personal preference for the Spring2 KTE and it will not be displaced by the Wavelight.