OE333

With the coming new streamer generation the USB-SYS output of the MP200 might possibly be used as a general audio out. This could then be connected not only to DAC/HA200 but also to other devices instead. But to give a definitive answer we will have to wait for the new client...

Both connections carry audio signals. The SYS connection is for data rates up to 194k, USB-Sys is intended for higher rates in future. I can not comment on possible sound improvements. I can only confirm that the standard cables guarantee error-free transmission with extremely low jitter. If you want to try something else: go ahead and let us know your findings.

Yes, I was referring to DSD from SACD, as this is what the original question was about. But of course you are right about DSF/DFF downloads and that these are not encrypted - thank you for your hint.

DSD over HDMI is the only "official" way to transmit DSD from a source device to a DAC. DSD over HDMI is well defined and specified and it complies with all legal requirements (like the required data encryption). Many manufacturers try to avoid the horrid licensing and certification costs of the HDMI interface and they came up with some other ways of transmitting DSD like DoP or I2S. It must be saiid that these alternatives are not legal and there is no accepted industry standard for it. This is the reason why incompatibilities with DoP and I2S interfaces can occur. In your case I would strongly recommend to use HDMI because both your OPPO and DAC_200 support it. The DAC200 DoP playback was tested with a number of different source devices and it worked flawlessly. The vanity card however was not tested. I know of many DAC200 customers who use DoP without problems. But as said above, DoP is often a problem because it is not an "official" format and there is no general and obligatory specification for it. The issue with the vanity card might come from the DoP marker format used by this card (there are different markers like 0xFA,0x05 or 0xAA which could be used). Do you have any knowledge about the Vanity's marker format ? I will gladly check what the problem with the Vanity card is - but I would either need more information about this card and the exact format used by it, or even better I would need the Oppo+Vanity here in our lab to examine it.

Sorry, but currently the Qobuz API does not permit sorting the favourites list. We hope that this feature will be supported by coming versions of the Qobuz API. For the time being, you could perhaps alternatively use Tidal instead. The Tidal API permits sorting your favourites according to different criteria (alphabetical, creation time etc.)

The MusicNavigator App works with MP200. Via the MP200 the App additionally can control a DAC200 and A200 connected to the MP200, but there is no way of using the MusicNavigator directly with the DAC200. Regarding MP200: AirPlay is on the list of planned new features for the MP200 - but I have no information yet, about when this feature will be available.

No need to do this update. It is relevant only for devices with HDMI module installed and it only affects the update process from version 1.0x or 1.1x to 1,2x. If you are already on 1.20 then everything is ok. If you intend to update from 1.0x or 1.1x to 1.2x, then don't use version 1.20 but use version 1.21.

Thank you @e.Latte. Interesting suggestions. Technically all that is possible of course. We will discuss this and see what can be done in one of the future FW releses...

The DAC200 has an Auto-ON function in combination with the MP200 (the MP 200 turns the DAC200 on when music starts). For non-T+A sources the DAC200 could be turned on via a RS232 command if the source is able to transmit RS232 telegrams. The 232 functions of the DAC200 are well documented. If needed I could give a link to the RS232 documentation. Currently there are no (+5V) Trigger-ON or music signal Auto-ON functions implemented in the DAC200 but I will check if such functions might be possible...

You can use both outputs simultaneously without any problems.

@e.Latte It seems that you are using an outdated version of the E_Link Update Tool. Please use version V1.02 or newer (the version number is shown in the headline of the app - see picture below). You can download the latest version from this site: https://github.com/OE333/DAC200-HA200-Update-Tool/blob/main/Executable/E_Link_UpdateTool.exe Btw: The file size is not the problem - the filesize is just shown for information. The problem is indeed the questionmark in the detected device name. This leads to the situation, that the detected device name and the device name in the firmware file do not match and so the programming tool does not start the programming process.

Sorry for not responding any sooner, but I was travelling and just returned home. I will have a look at this problem next week and see what is going wrong....

The T+A "True1-bit DAC" is a so-called FIR-DAC (Finite Impulse Response DAC) FIR-DACs not only convert the time-discrete DSD signal to a continuous analog signal, they also perform a filtering function (equivalent to a FIR filter) to suppress noise, spurious signals and the clock frequency. The number of "DAC elements" corresponds to the number of filter coefficients in a FIR filter. The higher the number of these coefficients, the better the noise reduction. If anyone is interested in the function of FIR DACs here some hints: The first (to my knowledge) proposal of a FIR DAC structure in literature can be found here: David Su and Bruce Wooley, "Oversampling Digital-to-Analog Conversion," Ph.D. Dissertation, Technical Report No ICL94-034, Stanford University, Aug. 1994 Please note, that already in 1993, one year before this publication, a 20 Bit 3-tap FIR DAC structure (the so-called T+A TDAL converter) was used in the T+A PreCD2000AC CD-Player/DA converter. In this paper in chapter 4.3 FIR DACs are described in general: https://www.researchgate.net/publication/338716687_Scalable_Digital-to-RF_Processor_for_Multi-standard_and_Multi-band_Low_Power_Wireless_Transmitter_in_5_GHz_and_60_GHz (click on "DOWNLOAD the full text" in the top right corner to download the complete paper) Here an other discussion of FIR DACs: https://link.springer.com/article/10.1007/s10470-018-1370-7 In the terminology of this article the T+A converter would be a "Single-bit semi-digital FIR filter architecture" A lot more information about FIR DACs can be found on the internet - just google for "FIR DAC"

The DAC 200 has a trigger OUT signal available on its "CTRL" port. This could be used to switch external devices (like power amps) ON and OFF. A trigger IN to switch the DAC200 itself on is not available. A possibility to switch the DAC200 ON would be by a RS232 command. So, if your source is able to communicate via RS232 I could give some hints how to implement the Power_ON function.

No, just the opposite. The NanoPi Neo4 is more powerful but it has far more peripheral systems on board - systems that are not needed for the audio streaming. All these systems produce electromagnetic interference. The RockPiE has just the bare minimum on board and is a lot quieter. So the RockE is an ideal SBC for audio streaming. I am sure that this is possible - please contact the T+A service dept. Alternatively I could prepare a SD card for you that you can use with your existing Neo4 - if you are interested, send me a PM...