Hello All,
I've been meaning to write about my experience with the DI. I purchased a DI about a month ago, version B with the added power supply to mate with my Reference One DAC. I thought the DI would be a good match for the Reference One.
My setup: iMac using Audirvana > Furutech GT2 USB cable > DI with power supply > BNC cable > Reference One.
I made no modifications to the DI, it is stock. I have not changed any jumpers.
For my Reference One, it was upgraded to include the DSP v5 chip which also has all the jumpers set to default.
From my Reference One DAC, I'm using gold plated (unknown brand) RCA cables to about a 40 years receiver, a Luxman R-1120. From the Luxman, I am using LCD-2 (rev1) headphones with standard headphone cable. I mainly listen to FLAC files and some 96khz music from every genre of music.
My experience with this setup has been good, but not great. There is a lot of detail throughout the entire sonic range and the sound stage is three dimensional. Highs are a bit harsh, some sibilance occurs when listening too loudly. All in all I was pleased with the pairing of the DI and Reference One but I was not blown away like I thought I should be.
Listening to Diana Krall's smooth voice, the system again does a great job of revealing all the details of her voice, the piano, bass guitar, etc. The highs with this type of music are also a bit harsh. If I switch up my selection to Jimi Hendrix, the electric guitar also fatigues me and I have to stop listening after about a half hour. Classical is a bit easier to listen to, not as much fatigue.
I chocked this up to my 40 year old receiver, the most unconventional part of my system. Surely this old vintage receiver is the X factor for this whole sonic experiment.
Enter a newly acquired Playstation SCPH-1001 with RCA outputs.
Wow. After listening to some Redbook CDs on the Playstation 1 I felt the presentation was more cohesive, the midrange was absolutely liquid. Some reviews accuse the PS1 of not being able to deliver the extremes of the spectrum and after direct comparison with the DI and Reference One, this may be true. However, simply put, I enjoyed the music more out of a $35 dollar PS1. It has an analog quality to the music, tonal accuracy, great sound stage, and it's also not fatiguing to listen to at all.
After switching back and forth between the DI + Reference One and the PS1, a couple things immediately stood out.
1. The PS1 is outputting a weaker signal than the Reference One since I need to use more volume.
2. The PS1 sounds more analog than the Reference One, no harshness at all in the highs. After comparison, it feels like I'm hearing some digititus with the DI and Reference One pairing.
3. The PS1 is a LOT cheaper!
Help me out here guys. Is this just the inherent flaw with using USB as a digital medium? As great as the DI is and as great as Kingwa's R2R PCM1704UK based DACs are, is it possible that a cheap sigma-delta CD player can provide a better musical experience, a more analog and cohesive sound? Is this simply a matter of CD vs computer audio? I know this is a rhetorical question and this depends on the listener every time, but I imagine that some folks must be disappointed with the quality of their digital audio when compared to CD players. After looking at the insides of the DI and the Reference One DAC I know these are quality pieces of equipment that that should be capable of outperforming a Playstation 1. I think this speaks more to the quality of the PS1, not to take anything away from the DI and Reference One.
Any tips for helping my DI and Reference One sound a bit less harsh, more analog? I've switched from the standard 8x oversampling on the DSP v5 chip to NOS. This seems to have smoothed out the presentation and killed a little harshness at the expense of making the sound stage a bit smaller. I appreciate your comments!