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392
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: Phasure NOS2
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on: April 16, 2015, 12:20:26 pm
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The beauty of it is that totally nothing heats up even a single bit. So total draw is 4 Ampere and all stays at ambient temperature. OK, those resistors get a little warmer.
For insiders : Input voltage is +/-15.8V. The regulated (output) voltage is +/-15.56V. So here's the big trick in "nothing heats up" because there's hardly any voltage drop (it can really be zero but I like to have a little headroom for at least this testing).
I get the gist of what you are doing now. So the onboard voltage regulation components are very well matched and don't dissipate much heat and so where the amps will be will stay cool as a result. Obviously this is secondary regulation...will the primary regulation be Class A in the other case/chassis? |
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393
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: Phasure PhD DAC
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on: April 15, 2015, 09:08:50 am
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Btw, I don't like the PhD name after all. Or maybe I do, but the longer I am thinking about it, the more I am missing the "known" thing. I feel that I will only be happy/satisfied with NOS2 ...
And it would still be justified - that "NOS" ...
I am not so keen on PhD either...perhaps a little wanky..or maybe it is just me because I know a couple of people who think their PhD is the thing that defines them. But on the other hand, we are 10 pages into this thread and we are finally coming back to the second post...hehehe. I am sure that something will feel right and eventually stick. |
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398
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: New NOS1 = ?
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on: April 07, 2015, 11:41:09 am
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Interesting. Will it be digital or analogue volume control? Neither. Well, the (remote) control itself will be digital, but all it does is controlling the voltage reference to the ladders. So it is not in the signal path ... (hey, what do you think !  ) Freakin' awesome. The slow volume change is my wife's pet peeve with my system, so a remote will be excellent. The way that it works though...of course!...and wow. |
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400
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: New NOS1 = ?
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on: April 06, 2015, 11:46:58 pm
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Anyway, this first PCB to really put to getter is for a fully differential power amplifier (an amplifier with two voltage sources both working in opposite direction, with very good common mode noise rejection and "no 2nd harmonic" exhibit).
The THD+N should be better than 0.00003% but how much better is yet to see (and measuring it could be a problem).
What? Did you add a zero or two in there Peter, or are you really shooting for sub 0.00003% THD+N? If so then...wow. Slew Rate is 1950V/us (  ). Yes, swoon is right...that is very, very fast. Similar low noise amps are rated 14V/us. And notice that this is not stupid Class D, so no HF sh*t either.
Also it will be a "cold" amp, or IOW if you don't use it or play softly, it will hardly consume power.
If this is not Class D but a cold amp then how are you keeping the heat down? Are you using SMPS? (joke) |
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401
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: New Phasure Modular Distinct D/A converter
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on: April 06, 2015, 01:33:14 pm
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Like Mamba315 says, I think that being able the vary the gain is quite important. The dac/DSP/amps will not only be used by the Phasure speakers so being able to set up proper gain structure for the system is very important. Anthony, a quick one for now because a bit busy ... (and before you're off yourself) : How would *you* see the necessary gain then ? How I propose(d) it is that we *all* need the same gain and then reflecting it to SPL required (I set that to 100). Maybe you can't do it ... maybe I am wrong, but ... Let me know. I'd have to say though that there's a headphone output just as well, driven by the same power amp structure, but a little different (because indeed, it would be a bit much of current). So we won't use/spoil separate channels for that. The headpone output will even be better because of the "gain part" not being there.  Regards, Peter PS: Do not make the mistake that the power amplification is made for the Orelo speakers. It is not. Still the 52W max can be the limiting factor of course, to make it work for everything and all (at 100dBSPL). Myself, I would like to think that gain could be altered by swapping a resistor or two to match the sensitivity of the tranducer. The less gain used the better I would have thought. I take it that you are assuming that everyone using this product will be 100% computer audio...no SPDIF or i2s input...or analogue input even. |
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402
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: New Phasure Modular Distinct D/A converter
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on: April 06, 2015, 01:03:50 pm
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"Phasure Modular Distinct" does not translate well for me...sorry. Can you try to explain to me why not ? I am not English based so it is a bit hard to see ... Peter Hi Peter, "Modular" and "distinct" are two words (in English) that I would describe as bland or mundane...they are often used to describe something or how to use it but not to sell something (unless it is from somewhere like Ikea which is pretty boring). So, your target market I assume for this product will be DIY'ers or switched on people developing their own acoustic system, so they are people with a little knowledge already. I would suggest a name that is distinctive but easy to remember and easy to correlate to you and to Phasure. For example, WAF audio have a DSP/dac product called the Najda board which is very easy to remember because it is an unusual word, but it is also a short word with two syllables and is probably easy to get people to identify that word with WAF Audio. "Modular Distinct" is going to be difficult for people to associate with Peter Stordiau or to Phasure because they are common words used in many different contexts and generally with subjects that many people find tiresome or mundane (espencially the word "modular"). I agree with Matt that Phasure ????? (one word - probably an unusual word and a short word) is the template that I would use to market this product. First make it easy to associate the product name to you and your company and then associate the concept to the product name. So Peter that is what I am thinking, and a little toward why I am thinking that way. I say this with best intentions and in the right spirit. Best Regards, Anthony |
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403
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: New Phasure Modular Distinct D/A converter
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on: April 06, 2015, 09:57:08 am
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Hi Peter,
As you know I am quite excited by this product and just how it ends up and can be used will be very interesting. Like Mamba315 says, I think that being able the vary the gain is quite important. The dac/DSP/amps will not only be used by the Phasure speakers so being able to set up proper gain structure for the system is very important.
I really appreciate the modular approach but to be honest am not rapt by the name you have chosen so far. "Phasure Modular Distinct" does not translate well for me...sorry.
Cheers,
Anthony
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405
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Ultimate Audio Playback / Chatter and forum related stuff / Re: Nick's "Chronos PC"
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on: March 10, 2015, 11:25:38 am
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I am wondering about the ATX LPS Mani. Did you notice anything when it was introduced? You have changed so much gear lately I bet it is difficult to keep up. Hi Anthony. Yep, definitely a lot to keep up with. Yes, the LPS definitely made a difference before this weekend's antics. It's going to sound clichéd, but I heard a blacker background and a generally more laid back (less 'overly-excitable') sound. Worth the 835 USD I paid? For me, definitely yes - I dreamed for years of ridding my whole system from SMPSs, and now it's finally been achieved. I'm over the moon. And the LPS itself is a very nicely put together piece of kit from Teradak, which worked perfectly straight out of the box - and how many times in this hobby have you been able to say that? Mani. Thanks for your impression of the ATX LPS Mani. It is especially interesting given your system is now very very similar to Peters. Can't help but wonder what would happen in his system and with his insight with both the LPS and the Chronos PC...there is a history of some 'advances' effectively shut down by a visit to Peter, but you guys sound quite emphatic about the changes this time round. Nick...how mature is your Chronos PC at the moment? Is a visit to Peter on the cards? Cheers, Anthony |
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