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essem

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About essem

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  1. Although old, this post from 2002 on diyaudio.com directly addresses the OP's question and is worth reading: https://www.diyaudio.com/forums/class-d/7754-digital-amplifier-project-2.html#13 (see post #13, the third one down by Bryan Brown)
  2. Hi Tom, Check out "Avantree Oasis Plus" (available on Amazon Australia). It does what you want. I'm using a couple of them to enable streaming from my phone (supports apt-x too) on some old non-bluetooth receivers using the optical out (also analogue out). Works well, and are easy to setup (so long as you read the docs). Cheers, ess.
  3. I heard similar loud hash from a little SMSL Dac/Amp when I accidentally fed it Dolby Digital from my PVR. Perhaps check the settings on your DVD player to ensure it always sends PCM over its digital outputs?
  4. Another high end Class D "integrated" from the Danes (includes usb, digital, mm phono inputs; 300wpc into 8ohms). Available here, a mere bagatelle at RRP $40k: https://www.stereo.net.au/news/aavik-acoustics-lands-at-entertaining-environments A Peachtree Nova on (heavy) steroids? Anyone heard it?
  5. Lyngdorf in Denmark put out a pretty impressive integrated last year (TDAI-2170) using similar direct digital chips as were in the old Panasonic XR receivers (Tocatta/TI Equibit/Purepath). Guessing around $5000usd, god knows what landed here or where/when available. Optional add on modules for extra analogues/xlr; HDMI; USB input. Pretty exxy for sure but remember no DAC needed. Modestly grunty at 85/170wpc into 8/4ohms. See some links to the raves here: http://www.avsforum.com/forum/173-2-channel-audio/1984602-lyngdorf-audio-tdai-2170-owners.html Anyone heard this kit, or have gotten one into Oz?
  6. Clay, forgive me if somewhere I've missed you addressing this but if I were you I'd first be checking out the existing rpi i2s dac addon boards (like hifiberry dac+ pro). You need to very sure sure your dac once you work out the i2s difficulties will clearly outperform these readily available pi i2s boards (sub $100us). By incorporating a Pi in your product, you are also taking ownership of the software and user interface issues -- a not trivial task that does not seem well suited to your existing core skills. Given the very rapid development going on in this area perhaps you could consider focusing on best exploiting your core skills. For example, you could readily distinguish your DAC from the competition using your great power supply engineering skill by designing for (optionally) a 1 or 2 additional configurable power supply outlets user configurable for 5v, 7.5v, 9v up to 2.5 amps and now you've got a dac with built in audiophile quality power supply(ies) on tap for the user's renderer of choice, be it a pi, BBB, Odroid, Sonicorbiter/cubox, microRendu or a zillion other upstream options that are here and going to appear in the digital transport/endpoint space. Absolutely not wanting to rain on the parade because making this all easier for folks to get started with audiophile quality digital music is laudable. Just food for thought anyway because I think the one thing established in this volatile space is that quality power supply makes a massive difference be it i2s or usb sources. At least get chummy with someone with the all the computer/OS skills if you want to incorporate a renderer into your dac. Hope this helps & best of luck with your R&D Clay. Cheers, essem.
  7. For someone starting out and wanting a really low cost way to get digital music into their analogue amp I don't think you could go wrong with a Behringher UCA202. Readily available here for about $60, it provides a usb cable to a small external soundcard which provides a dac (rca out to your amp), a toslink digital out (to connect to a dac), input RCA's (e.g. record vinyl from your amp's rec-out or your preamp via uca202 into Audacity), and a headphone connection to boot. Works with everything (mac, windows, linux) without a problem. I always take one with me when I travel with the laptop. Its a fantastic little device. Limited to Redbook (16/44 or 48?) sources is the only limitation but really great flexibility for the price. If your music is just mp3 or streaming from digital radio its probably all you'll ever need. Hope this helps. Cheers, essem.
  8. I share Dave's interest in learning how to measure in room performance, so I second his request for guidance on a decent microphone to buy for use with REW. Thanks in advance. Cheers, essem.
  9. I humbly offer the above posts #98 and #99 as argument that this thread could be more accurately renamed: "sexualised objects in hifi land". And you wonder why women drop off participating here?
  10. Indeed, Sime, enquiring minds want to know! Looks like the decoding is in the DAC so far but its very early days e.g. Mytek have announced an firmware upgrade for their Brooklyn dac that provides MQA support: http://www.theabsolutesound.com/articles/mytek-release-mqa-firmware-update-for-new-brooklyn-usb-dac/ and Brinkmann's Nyquist DAC claims MQA decoding: http://www.brinkmann-audio.com/main.php?prod=nyquist&cat=default?=en Other than Meridian's own MQA DAC, any others yet? Aha! I see Mr Darko is on the hunt: http://www.digitalaudioreview.net/2016/04/the-mqa-revolution-brother-you-have-to-wait-and-see/
  11. Sorry if its been referenced elsewhere, but Bob Stuart's answers to the Q&A on CA are now available: http://www.computeraudiophile.com/content/694-comprehensive-q-mqa-s-bob-stuart/ There's alot to take in there. I asked Q42 about decoding requirements. Its software only, not hardware, which is good. But I'm not sure I fully understand his answer -- does he mean the MQA decoding needs to happen In the DAC itself (see A42a) rather than it happening upstream, for example in a playback device which just generates USB or spdif input for the DAC? Oh well, at least his answer to Q42c is not a flat no. I should add -- kudos to Bob Stuart who seems to have genuinely spent a huge amount of time trying to give fullsome answers to all questions. Thankyou Bob, and to CA for the opportunity to ask.
  12. Another option to consider is to use an ethernet cable, or an ethernet over powerline setup if its long distance, so you can stream over the wire. Any of the cheaper EoP's would have more than enough bandwidth to stream music. See some decent EoP options here: https://www.pccasegear.com/category/200_1348 If you can possibly stick to wired ethernet a world of cheap good sounding streamers using single board computers opens up to you, and its also a bit less strain with hires material over the wire than wireless I think. Hardware like Raspberry Pi, Odroids, Cubox's and the like are readily available here. If you have a friend with basic linux skills its really easy to get a nice audio optimised distro installed on a micro sd card (eg volumio, runeaudio, mubox, voyage linux). Many cheap and good sounding options to feed your dac with usb; some of the SBCs even have spdif out. Suggesting this as in my experience ethernet is just more reliable and less error prone for audio. Configuring wireless on the single board puters is certainly doable, but most normal people don't want to be fiddling with the command line and there are so many different hardware/wireless dongle options it can easily be confusing. The EoP devices usually work very well. Just a thought.
  13. I just found this very knowledgable well written up to date overview of networked home audio options (his emphasis is on the open source world): http://www.lesbonscomptes.com/pages/homenet-audio.html It might almost certainly help the OP make sense of alot of the advice here. I've been dabbling in this stuff on and off for a few years and this piece helped me put the whole digital playback picture in context without getting at all bogged down in "which dac" type questions. Many thanks to the author Jean-Francois Dockes for sharing his hard won knowledge and experience.
  14. Surprised no thread with MQA in its title so I'll don my flame proof underwear as I point people to this: http://www.techhive.com/article/3018751/home-audio/mqa-was-one-of-the-best-products-of-ces-2015-soon-well-finally-be-able-to-buy-and-listen-to-music-e.html So the claim is lossless studio quality recordings (MQA=>"Master Quality Authenticated") but at CD file size, so very easily streamable. Backwards compatible with Redbook (ie. files will play on your current kit) & claimed to sound a bit better than CD. But using MQA decoders which do full decoding claims to represent what the artist mastered in the studio i.e. its a new codec but one which is designed for studio master quality at CD size. I find this an exciting development. Am I weird, gullible or both? Attack away boys....
  15. Why flac over wav? This. I've come across the odd player where the user interface relies completely on tags for author, genre, year and so on. I can't hear a difference between flac/wav. If you have a flaky or constrained network and are streaming size might matter too; I experienced that with some early raspberry pi experiments -- very ocassional stutters on wavs but not with smaller flacs.
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