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gibbo9000

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About gibbo9000

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    David

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  1. Some close out notes on the Uwe Beis A2D Converter Kit - AD24QS 24 Bit / 192kHz. https://www.beis.de/Elektronik/ADDA24QS/AD24QS.html#DIY I have modified the resistors so it is now 3v full scale input and the overdrive led is triggered only very occasionally. But I did learn a couple of things in case anyone else thinking of building one finds this: The resistor sets Ra and Rb that control full scale voltage should ideally be in multiples of 1.1 to 1.2 - so 2k2 and 2k4 for 2 volts, 3k3 and 3k6 for 3 volts etc. Uwe's notes "The correct ratio provides an optimal common mode rejection when converting an unbalanced (or badly balanced) signal into a balanced one" The board is set up to easily make the gain fully variable. The relevant notes are actually under the description for the AD-IOA extension kit under modifications on the AD24QS for the AD-10A. Basically set the full scale resistors to 5k36 and 5k9, populate R3 and R20 with 30R, and add a 2k pot (negative log recommended but not where to find them!) across points on the ST header (see circuit diagram) Gibbo
  2. Thanks Andy - not disappointed from what I have heard so far. Appreciate you notes that led me to it. I am also surprised by the overdriving given specs of cartridge / pre-amp - looked like I would have been well under. But I am getting quite consistent 'overdrive' led on some passages so will have a go at adjusting. Uwe suggests next 'stable' matching of resistors sets peak at 3v so I will do that and see what happens. If that is too low the board actually has circuitry to make further adjustments using some circuitry the related USB / Volume control kit uses -- details are on his circuit diagram. Will certainly go down the LPS path - wall wart was easy for quick testing it worked and getting a handle on gain. From specs it only draws 200ma - so may even piggy back off the 12v LPS powering my miniDSP. Gibbo
  3. Aussie post finally got around to delivering my Uwe Beis Analogue to Digital converter kit that @andyr uses. Runs up to 96kHz Optical and 192kHz Coax. Busy circuit board but straightforward build with no complications on the way through. Haven't had a kit before where the resistor leads were bent to the board spacing and cut to length! On early listening it sounds great with just a standard 12 Volt wall wart. I built it using the standard set up which is based on a 2 Volt peak input signal, but my cartridge / preamp combo (not adjustable) over drives it just a little. The peak signal can be adjusted by changing two sets of resistors (4 in each set) so have started that process. Getting the 8 resistors out was a little fiddly - made easier by the silicone tube on the solder sucker tip.. Quick trip out tomorrow to get new set. Planning to 3D print it a case and line with copper. Gibbo
  4. Please don't take my comment the wrong way. It is a very good turntable that I thoroughly enjoyed it, as I am sure you will. It is why I spending more time listening to vinyl and have gone the 4x cost upgrade to separates!
  5. Time to upgrade . . . . . hires is a good, balanced combination but no real upgrade path without messy mods to bypass onboard pre-amp (which doesn't naturally expose the cartridge directly)
  6. Just happen to have pic of accessories pack as I sold mine a few weeks back . . . unlikely to have changed. Platter is separte to this.
  7. Pretty sure it will come with a felt mat - mine did. Their is some discussion on whether you are better off not using it though - just put the vinyl direct on the acrylic platter. Enjoy.
  8. Back to the core ADC question. Current search is purely for an ADC as I have a phono stage. After some reading around the Behringer Ultramatch (@muon* suggestion) I was impressed with the reviews, and regard for the AKM A/D chip they use. Also has a good mix of outputs for flexibility (Optical / SPDIF and AES/EBU). The AES is useful as miniDSP SHD accepts it, and it keeps optical / SPDIF free on SHD for CDP and Cassette deck. And Audiosmile do an Analog stage upgrade for it as well. So I grabbed one. It is wide with busy front panel, and as pro-audio doesn't have feet - and lockdown stops me going and grabbing some. I have connected it from phono stage with 6 inch RCA interconnects and (at present) cheap RCA to XLR adapters, and optical to SHD. Very easy to put in A/D mode and select bit depth / sampling frequency. And after half a dozen albums I am impressed. Certainly on par with Schiit Jil if not better - great sound stage width and depth, and a clear 'warmth' of cartridge / TT coming through. Chuck Mangione - Feels so Good (Audiophile Vinyl) a definite step up from streamed version. So certainly not budget quality performance - feels well up to the task on Project Xpression / Ortofon Black./ Rega Fono MM feeding the SHD. Next step to upgrade the cheap XLR adapters and try the AES/EBU connection to SHD - and get it some feet. It is the 1RU silver fronted thing on top of CDP. Gibbo
  9. Either, but with a nuance. The Roon options available for the SHD (in current implementation) are Fixed Volume or Device Volume. Under Fixed Volume, Roon outputs at 100% and volume control is via SHD remote or front panel knob only. Under Device Volume, Roon and SHD volumes 'integrate' for lack of a better word. So SHD physically does the volume controlling, but can be changed from Roon, SHD remote or SHD knob. Change volume in Roon and it changes on SHD. Change in SHD and the change is reflected in Roon volume display. So that is a long winded way of saying it is a vaguely intelligent integration where you can control volume via Roon or SHD inputs, but Roon isn't physically doing the volume controlling. So mine stays in Device Volume mode and has no issues. Hope that makes sense. If not blame on Vic Covid crazy!
  10. Yes - Roon have basically got tired of what they regard as a bunch of freeloading HiFi component vendors that claim 'Roon Ready' without being certified. So last week they announced an ultimatum that as of 21st September you would not be able to enable a non Roon Ready certified device on Roon, or renable an existing one. This caught a number of us by surprise (including miniDSP SHD users) and concerned about implications for our ongoing usage, and certainly phased a few potential purchasers. Ensuing public s$#% fight between users, vendors and Roon COO played out in public in Roon Labs Community Forum made entertaining reading, and rapidly led to some backing down on the ultimatum and apparent new levels of cooperation with vendors.
  11. Maybe wandering a bit - but it is all part of the same integration issue we are working around / through. From my read of the Roon and miniDSP issue (and NAD M10 etc.) I sense DIrac enabled devices got into the too hard basket from both sides - particularly around Roon's desire to declare the full digital decoding stream for their interface for any bit of music playing. Feels like just too many moving parts with Dirac in there as well and a bit of a stalemate. The miniDSP guys suggest there has now been a meeting of minds around a potential solution and that this is now not far away - and that is supported by the Roon Labs community support input. Not sure they will make it by the 21st, but hopeful soon after. And as a committed SHD user I eagerly await that as I find it a brilliant device as a digital preamp -- source selector / volume / PEQ / X-Over /Roon End point / Dirac processor etc. Sometimes wonder whether the full SHD (vs Studio which I have) would be a better choice, but expensive change now. Just need to find a neat, way to do the A2D from TT / Phono pre-amp that provides one of Optical / SPDIF / AES output to SHD, and also USB out to PC for digitising without too many adapters / converters or devices in train - and get the right 'quality' price point to match rest of system. Gibbo
  12. Also struggled with that question. My takeout is that the analogue jacks in the professional gear seem to be combined XLR and TRS. So in HiFi world it is just an unbalanced RCA connection to balanced XLR. So an RCA to XLR adapter or cable would also work similar to TRS to RCA adapter mentioned above. So for these type devices I am aligned with sir zingmore - turntable connection to phono preamp with associated grounding, and then RCA out of phono preamp (in my case) to ADC using RCA to XLR. From my reading, for short runs RCA / unbalanced cables should be fine, with XLR / balanced better over longer distances. The bit I don't really understand is the role of the 'transformer' based unbalanced to balanced cables versus the static/wired adapters (and also suggested in things like the Behringer SRC manual. It does feel a bit untidy and will be interested to do some listening tests vs the Schiit Jil via RPi. As per the title for this thread - it is good to hear of additional options available in the pro world - but there must be limited demand for this type of solution if the HiFi side are exiting stage right apart from specialists like Parks Audio etc. Gibbo
  13. . . and within a few hours of each other both an RME ADI FS V2 and an Apogee Rosetta A/D appear in the Classifieds . . Note: then I checked and it is Pro version of the RME that has Analog In for A2D
  14. Great pick up of the PS Audio. The Edirol looks like a great Swiss Army knife of conversion - and another one that joins the 'where have they all gone' list. Given I already have a competent phono pre-amp this is exactly the kind of device that would do the trick, as would the Behringer. Certainly some real options in the pro audio field that this thread has drawn to my attention. Will PM
  15. From my experience it doesn't have the capability to distinguish. If you are using the acoustic timing reference it expects you to turn off everything but the Left Main (if chosen as timing reference) and the speaker you are testing - so just Right Main or Sub. It took me a few attempts to work out that is what it wanted (and how to do it!). That way it simply compares the timing of the reference 'ping' on Left to the other speaker you are comparing it too. Will defer to others if I have that wrong - but worked for me.
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