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be placed from the power supply to it? I want to put them both in the same chassis.
Thanks!
Follow Ups:
My Power Supply is in this chassis:
And my DAC is in this chassis:
And overall it looks like this:
Absolutely quiet, sound is sublime. Size-wise, it's 90% output stage and power supply, 10% DAC. All power supplies are linear, choke input design for low noise. Twisted Pear Buffalo IIIse with Sonore USB/I2S board and 26 DHT tube output. It's also a full-function preamp with 6 RCA inputs as well.So I guess my answer would be to put the PS in a separate box if at all possible, and don't skimp on the output stage - it's what separates a generic DAC from an outstanding one, IMO.
Edits: 01/22/15 01/22/15 01/22/15
Hi i see on ebay many complete dac boards using well known dac chips.
I understand that the dac chip is just a part of the whole unit, still there are some extremely cheap boards using dacs found in very top quality units.
Like the one in the link using the CS4398 that can be found, as an example, on the Prism Sound Orpheus, one of the best pro audio interfaces.
I would be curious to listen to one of the kind.
Thanks.
Kind regards,
bg
Edits: 01/21/15 01/21/15
I like in particular the use of a EI transformer very uncommon in dacs
I have always thought that this is the kind of transformer that can provide the better isolation from mains noise
It has a little more magnetic flux leakage maybe (you can always add a little metallic mesh as a shield)
but with digital i like this type more
Kind regards,
bg
Edits: 01/17/15
Yeah, supposedly being fussy about PS design and then using a toroidal transformer right at the start is just plain stupid. Assuming we're concerned with performance/quality, and not just "packaging". Appeals to the rubes though. There are better configurations of EI design than what that looks like, and better configs than EI too. [I think we talked about that not so long ago, re a Teradak (sp?) PS you might have been interested in.]
I don't get too agitated when some of my gear uses toroidals, actually lots of it does, but I know it's all about practicality and packaging and not performance.
I do enjoy the pics everybody's posted! Nice to see the guts of stuff.
Hi i am sure that with proper filtration the toroidals are just fine because i saw them in very high end units.
Maybe the EI types can make life simpler ?
The transformer you mention maybe is the one in the picture ?
the two windings primary and secondary are separated like in the EI
This should give a filtering effect ?
Kind regards,
bg
Edits: 01/18/15
The noise, EMC and needed shielding/separation from DAC circuit will be completely different if the PS is switch-mode.
Hi and yes i think so
I see more linear PS than switching PS in dac, even high end.
This solution seems more common.
Anyway you know of top units adopting SMPS ? that is interesting
I think that digital is more delicate than analog regarding PS.
Thanks.
Kind regards,
bg
The power supply should be as close as possible and if you must wire it, make sure to use a short twisted-pair cable. The power subsystem only starts at the power supply. Regulators and power decoupling on the main board are critical.
In most of the cd players and dacs I have seen, the power supply is simple enough: power transformer to rectifier, then rectifier to cap and then to voltage regulator and then out to the parts.
If power amplifiers (ie.tube amps, etc) benefit from pi filters or more so, choke/inductor filters, then why not do the same in cd players and/or DACs?
Thanks in advance.
why not a separate box? Doesn't add much cost. Benefit could be big.
E
T
Agree 100%
They did not use as big transformer as their separate power supply but you can see everything is kept away and placed as far as it can go.
Their reference series stuff almost always have a power supply in a separate chassis due to its size. Here's one of their largest power supply for a DAC ( or CD player ) taking up the entire real estate in the same size chassis as a DAC.
In which case the power supply usually is placed on a secondary shelf ( ideal ) or at least with an ample space above it.
Edits: 01/15/15 01/15/15 01/15/15
Not everything, just the transformer. I don't think the transformer location was intentional for that reason though.
The second one is bigger than a lot of power amp power supplies!Dave
Edits: 01/15/15
but Naim built their business ( and the house sound ) on their over spec'd power supply.
I could use two of those large power supplies for my CD player. One to power an analogue section and another for digital. To my surprised an addition made a difference.
Here is a separate power supply for one of their amplifier. The transformer seems slightly bigger than the digital PS I've posted on my previous post.
I hope you have a lot of rack space! I have always admired Naim from afar. They are a bit out of my price range, but I bet a Naim rack would make my Spendor BC-1's sing!
Dave
Usually split the rack in two. One for power supply and another for audio circuit carrying head unit. Sometimes shelfs are left empty to give enough distance above power supply if a source components are above it.
It's a bit of anachronism now as the trend in hifi has been less boxes and they need to be invisible.
This system only has one source but it's an active 3 way with 3 amps. All the power supplies are away from the head units. Looks like his CD player gets 2 separate power supplies.
I am still a believer that "size matters". It is true that they can do amazing things with small boxes, but you get the best results, to my ears, with the traditional, large power supplies. (Tri-amping helps too!)
Dave
.
If I were to design a DAC, I'd keep the analog, digital, and power supply sections as far apart as possible. Maybe even in separate chassis.
I'd also shield each section with mumetal.
When RFI is brought to a minimum, it can transform the sonic performance. In my opinion.
Keeping the power subsections apart is unnecessary. It is only necessary to avoid return-current path sharing.
Edits: 01/16/15
It is very close in the Parasound Halo integrated amp
And further away in the NAD C 356BEE
It is very close in the Hegel 80
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