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Everything posted by ray-dude

  1. Good for you! Can wait to hear what you hear (and hope it doesn't make too much more antsy for my SR7 )
  2. I think it is inevitable that Rob Watts (designer of the DAVE) adds digital equalization to his DACs at some point, but alas, Chord DACs currently do not have this feature. The full signal is sent from each output. With the 9.87 Pi units, they have a natural fall off around 40Hz. The Pi bass units have an active control for gain, low pass frequency, and phase (with a couple other things). I tune these to blend with the natural response of the 4D drivers. The good news is that there are no cross overs on the DAVE to 4D driver path (direct wire connection from DAVE to driver), which gives m
  3. What's to debate? The speed and stability of the PH supplies is outstanding. You should be able to hear it quite well on the analog outputs stage of DAVE. I'm am (VERY) patiently waiting for my Paul Hynes SR7 to work its way to the front of the custom build queue, so I'm sticking with my Sean Jacobs DC3 supply for now, but I would love to hear a PH supply on the DAVE.
  4. SFP+ is definitely on my "try it" list, but it is a big commitment to move to a 10G network end to end. I strongly suspect there is a similar speed vs power/noise tradeoff with networks as a bunch of us have seen with CPU - faster you drive the system, the better, until you hit a point where it becomes worse. If one puts in better power, that peak in SQ moves to higher performance. Fortunately, it is a lot easier to power a NIC/switch/router than it is to power a server. I do use MM to connect my two EdgeRouters (1m cable). I'll pick up a longer MM fiber and give it a try vs my
  5. I have not tested an MM transceivers yet. Have you seen spec sheets where they are less than 500mW consumption? (best I've seen/heard for SM). Alas, we're still in the empirical stages for these transceivers...try them and see if they sound better, then look at specs and try to figure out why things may be different. Related to the network use comment, there is a definite SQ win in isolating my audio network from the rest of my home network. Having my server on an isolated LAN (no broadcast or other traffic from my home network) definitely has a positive effect. Back when I was
  6. If the root cause is induced noise to power/ground plane, things are more insidious. A faster interface would have faster switching components, which could be generating a different noise profile. Depending on the sensitivity of the rest of the system, moving the noise could help or it could hurt SQ. Other than the truism that less noise is better, noise related SQ impact is devilishly difficult to rationalize or connect the dots on (so system/environment dependent).
  7. The correlation I have seen for SFPs seems to be more related to power consumption of the module. I suspect the mechanism is some induced noise from the transceiver. Generally speaking, the lower the power consumption, the better the sound. That being said, the different categories of SFPs (laser type, speed of interface, etc) seem to have different power profiles, so the correlation extends to those factors, but my spidey-sense (gut) says power consumption may be the key dimension for sound quality
  8. This is crazy cool! Alas, I don't think the reconstruction math works that way. Each Mojo is applying 26k taps (~11 bit reconstruction accuracy) to 2 stereo channels. I presume the compute is there to apply to a single channel, but it is not built to do that. The output of each Mojo would still be 26k tap output. For reference, here are the tap lengths for various Chord DACs: Second column reflects the bit accuracy (vs a pure sinc function) of the WTA reconstruction filter. Remember, an infinite length sinc filter will perfectly reconstruct a
  9. I think you'll be shocked at how much tension goes away with a quality supply on the 5V (RF is a bugger). An alternative is to use the stock DAVE SMPS for the 5V and your Keces for the +-15V. The stock supply is quite good, but a Sean Jacobs or Paul Hynes is a LOT better.
  10. As a former Chord Blu2 owner, I think they would have a killer transport with a modest quality CD transport, robust casework, USB in, ethernet in, USB out, and running embedded HQP for upsampling (PCM to PCM sinc-M could be done very cheaply from a compute budget). It would sound extraordinary, and be end game for 99% of the people out there.
  11. If you check out Part 1 of my Extreme Review, I list several MA tracks as go to reference tracks. I highly recommend getting the MAonSA SACD sampler. The SACD layer has ~70 minutes of music in DSD64, and the Redbook layer has ~70 minutes of different tracks. It is basically 3 full albums of music from various recordings. When I first got it and listened through, I promptly ordered 10(?) albums from Todd, so beware! If you don't have a SACD player and get the SACD, drop a PM we'll take care of you.
  12. My experience is similar to Joe's (I purchase everything from Todd as soon as he posts it). Some of the music is challenging, but I've found that there is a common musical thread through his releases that I attribute to Todd himself. In a subtle way, he is a part of the creative team on each of his recordings. On the most challenging albums, I look for that thread, and it connects me back to a foundation to build on. Listening to Todd's recordings has been akin to master class...I've learned so much about so many different kinds of music!
  13. Fun project! I happily use a RaPi as a Roon end point for my patio speakers. This might be a fun retrofit project, esp. since the RaPi is now connected to a PoE capable EdgeRouter X SFP. Chris, hope you and yours are safe and in good spirits...
  14. I can't speak to the Phoenix, but as another wrinkle, Chord DACs require Vbus for the initial USB handshake, but after that it can be removed (a neat trick with the switch on the USPCB).
  15. ray-dude

    HQ Player

    @Miska I'm looking forward to trying sinc-L this weekend! Could you speak more to what you were trying to achieve with this filter vs sinc-S/sinc-M and filter performance? (appreciate the insights you shared on the sinc-S filter a couple weeks ago) Looking forward to hearing this one!
  16. Maybe I'll get a nice Class D with switching supply and have that remind me what I don't pay attention to amps any more If I waver, I need you guys (as my sponsors) to call me out and help me hold the line... That being said, I would be delighted to foster any SETs that are looking for a home during these troubled times
  17. ...and this is EXACTLY why I'm in complete denial about the existence of SET monoblocks...something like this in the house would become a full time job (obsession?) Gorgeous work Nenon!
  18. +-15V, +5V. My Sean Jacobs supply is over-spec'ed to support up to 5A on each rail, which is way more than what the DAVE is consuming, but I never measured what it actually is consuming Love the giant horns!!
  19. When it's all in house and you've had a chance to listen, please report back!
  20. Yes, open the case, couple screws to remove the stock SMPS, connect the power connector to the DAVE PCB. Completely reversible, takes about 15 minutes because of all the screws. For a new DAVE, obviously has warranty implications and isn't endorsed by Chord, etc. I spent a bunch of time on BNC cables. I ended up with the following as my preferred: https://www.head-fi.org/showcase/audiowise-opto•dx-optical-isolation-bridge-for-dual-spdif.23757/reviews#review-22155 with Nick's WAVE cables as the top of class for traditional cables. It's been a while since I
  21. I hope you enjoy it, and please report back! I always found better transparency and detail through the RCA output of DAVE to speakers. I use the XLR outs to the powered Voxativ Pi bass units, so not an issue for me. Do note that depending on your speakers, you may be wishing for some pop or dynamics going straight from DAVE (I did with my Voxativs). I ended up getting a Sean Jacobs custom DC3 supply for my DAVE, and it resulted in a (mostly) no compromise experience for me. Reports from folks with his new DC4 supply is that it is even better still, although I am patiently waiti
  22. I have not heard the Ideon myself (I went from ISORegens to the tX-USBultra). Based on how the SOtM tX-USBultra SE with Paul Hynes SR4 actually was degrade SQ for me(!), I suspect the implementation of the USB PHY on the chipset is having an outsized impact vs reclocking, power, etc. That is part of what is appealing for me with the JCAT USB XE...same chipset, but with the bonus of better power, etc. Based on the specs and vintage, if I had to guess the Ideon is not using the ASMedia chipset, but as folks on the right side of the pond are fond of saying, the proof of the pudding i
  23. That’s awesome! I’m glad you’re trying something new and it is working for you! Rob Watts has written extensively about his digital volume control approach. See as a starting point https://www.head-fi.org/threads/chord-electronics-dave.766517/page-143#post-12429044 basically absolutely no issue at low volumes because of the precision of the digital pipeline
  24. Thank you @skatbelt for the thoughtful note. I think you're lasering in on the "Sophie's Choice" with digital audio: isolation and quiet to not disturb the DAC, vs signal precision and speed to not disturb the DAC. With my dual i7 NUC setup, I was pushing as hard as I could for the former (with EtherREGEN and tX-USBultra SE, although I had not yet jumped into the reference clock world). My next step was to add a Mutec reference clock, then moving to a better power supply so I could jack the CPU clock higher (there was a very distinct point where higher clock led to worse sound,
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