There is really no benefit to thisā¦. the contextual spectral-harmonic, dynamic and spatial elements and Nyquist Frequency (Fs) are codified in the PCM fileā¦ If you are talking 192kHz, the Nyquist Fs is 96kHzā¦ the Nyquist of a 5.6MHz DSD file is 2.8MHzā¦ What you are gaining is a more natural signal waveform with the full PCM dynamic-range revealed to output, and the difference between 5.6MHz and 11.2MHz will not be tangibly audible.
in France the rare pieces are sold very quickly, I wanāt to test it on my system, I donāt buy on specs. By the way I canāt find a review of the sound (Jayās Iyagi, Audiophiliac, Cheapaudio manā¦ havenāt test it). A store will lend it to me at the end of the monthā¦ I will report my impressions.
Reviews of the UD-701N are not a direct comparison, but relevant and contextually usefulā¦ virtually the same platform, with some distinct I/O differences and some power-supply topology differences.
not sure the 701 has the same FPGA and TRDD5.
Yes, they share the same component topologiesā¦ this is what makes the UD-507 so excitingā¦ Iāve been waiting for this productā¦ I wish it were just a pure DAC without the HPA topologyā¦ but Iām sure the HPA is better than my HA-501 
made a long test of the 503 VS the directstream of PSaudio, the TEAC is more liquid and better to my ears.
The UD-701N and the UD-507 and the Esoteric DACās are following the DirectStream DAC MKII and the Playback Designs Merlot design dogmaā¦ Apparently, the āMount Massiveā firmware update to the DS MkII DAC has made a dramatically tangible improvement in sound-quality
to tell the truth I was sure to buy the PS audio, but my ears after 2 day of intensive testing told me to keep the TEAC. The seller told me that it was the last firmware, a very good product and a beautiful peace of tech by people like Paul and Ted, If I had enough money to keep the bothā¦
The āFluency Logicā DSP employed in the newer platform modulator, may be the differentiator for TEAC devicesā¦ This algorithm extrapolates missing sample-to-sample harmonic and dynamic information in the source bit-streamā¦ Have you utilized the UD-503 DSD modulator to 11.2MHz? My feeling is the FPGA operations utilizing the Fluency Logic algorithm in the UD-507 will produce very satisfying sound-quality results on PCM signalsā¦
thank you to make me discover Merlot DAC.
not sure to understand the question, I upsample in Audirvana and go straight with no treatment than a 50k filter from the DAC. Upsample PCM to DSD with the 503 was not as good. The settings of the DSD oversample in Audirvana took me time to adjust to my system.
found one test : https://www.phileweb.com/review/article/202406/21/5645.html
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Iāve tested The 507 vs the 503, with and without the clock.
The 507 is more dynamic and engaging with the one bit treatment.
A 503 with the clock is no so far of the 507 in multibit. Someone who found his system a little fatiguing with the 503 has better to buy a clock, the previous model can be found new at a good price (around 1K ā¬).
the clock allows to stay below the threshold where the music loses its perfect coherence and the sound scene as the timbres gain in all dimensions. On the 507 the clock makes that we have both the percussive punch and the freedom of the timbres freed from any greenness when listening at high volume. The oversampling in 256 acts as in 128 by increasing the effects of this digital processing before conversion. As the 507 goes in the direction of the presence of the artists and the life of the music I bought it. The introduction of āblack or Whiteā terrified my wife who thought that someone was tapping on a window, and she finds that Johnny Cash is ātoo much in the living roomā. 
In short, enough to wake up a system a little extinguished. Goes very well with tube preamp and McIntosh an big JBL to make ā¦ music. it saves the flat recordings of some first CDs of the 80ās (The Pogues, Madness ā¦). In conclusion, I listen to music less loudly without frustration.
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TEAC has gone to the expense of creating their own driver for Mac (like ASIO for Windows, as you mentioned), which allows them to bypass Core Audio and its requirement for DoP. The problem with Damien doing the same is that drivers interact with the MacOS kernel, and Apple therefore restricts the drivers it allows. Damien in fact had a driver for MacOS (it was called Direct Mode), and several MacOS versions ago when Apple moved to greater kernel security, that driver and many others could no longer work.
Damien requested access, but Audirvana is not a major software or equipment maker, so that didnāt happen. TEAC, on the other hand, is of course a major equipment maker, so Apple had the incentive to allow the driver TEAC made using the ITF Audio Toolkit.
Edit: There is a workaround for this, which is to use a streamer (UPnP endpoint), so Audirvana on the Mac can then send the processed/upsampled file to the streamer, which either has an onboard DAC or can be connected to a DAC with a USB cable. Because the Mac is sending the signal by UPnP rather than USB, there is no requirement for DoP.
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What are you talking about hereā¦?
Are you confusing the TEAC HD Player with the UD-507 DAC design that converts all PCM signals and lower sample-rate DSD signals to DSD256 if the pure 1-bit modulation algorithm is implemented, as in its progenitor Esoteric DAC design architecture, and the TEAC UD-701N Network Player, the Playback Designs DAC and PS Audio DirectStream DAC MK 2 design architectures?
The only optional driver for macOS that TEAC provides is the USB Bulk PET packet management protocol, as the UD-507 supports Bulk PET as a client.
All DoP de-embedding is integral to the UD-507 FPGA DSP operations that are symbiotic to the pure 1-bit architecture of this DAC.
Have you ever stopped to think about the ramifications of sending high bit-rate 1-bit PDM signals via a transmission protocol that has no error-correction, as is the case with Ethernet protocol in the context of digital-audio playback?
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Yeah, then I realized the Internet wouldnāt work if this was a real concern and went back to sleep. 
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Not the sameā¦ a poor juxtapositionā¦ digital-audio transmission is a different animal under different conditional circumstancesā¦
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Ah, because the packets you just sent from your computer were āregularā Ethernet packets, so they somehow knew not to get scrambled into nonsense, whereas those poor digital audio Ethernet packets are somehow much more stupid. Of course, makes perfect sense. 
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But butā¦ā¦the ramifications
Happy New Year mister 
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Noā¦ there are ramifications of bandwidth and slew-rate in the components required to handle the bit-rate ā¦ ever heard of BLER?
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And to you
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Your sarcasm is moot and myopicā¦ and has no contextual basis from which to have gravity regarding the application of UPnP protocol operating on the āTransport Layerāā¦ 
UPnP protocol does not support error-correctionā¦
- QoS for UPnP consist of Sink Device (client-side/front-end) and Source Device (server-side/back-end) service functions. With classes such as; Traffic Class that indicates the kind of traffic in the traffic stream, (for example, audio or video). Traffic Identifier (TID) which identifies data packets as belonging to a unique traffic stream. Traffic Specification (TSPEC) which contains a set of parameters that define the characteristics of the traffic stream, (for example operating requirement and scheduling). Traffic Stream (TS) which is a unidirectional flow of data that originates at a source device and terminates at one or more sink device(s).
- Universal Plug and Play - Wikipedia
The User Datagram Protocol (UDP) is a connectionless protocol, which does not provide any acknowledgements from the destination. Although UDP is considered less reliable than TCP because it provides no guarantees of packet delivery, it is often preferred for streaming media applications because of its superior real-time performance. The popular Realtime Transport Protocol (RTP) used in many streaming media applications, defines a packet format for network delivery of audio or video, which itself is typically carried inside of UDP.
[Reference: AESTD1003V1 2009-06-04]
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