Jump to content
StreamFidelity

DIY Project High Performance Audio PC with high quality wiring

Rate this topic

Recommended Posts

On 2/22/2020 at 5:54 AM, Energy said:

 I definitely miss the sound stage of DSD512 so much that I sometimes go back to the AMSDM7 512+fs modulator just to play DSD512 with acoustic music for a better sense of head space.

 

I feel the same about the 256/512 difference - but I’m just not sure if the Lampizator DSD512 implementation is just optimized that way. 🤪

Share this post


Link to post
Share on other sites
23 hours ago, ray-dude said:

 

I've had tremendous results using custom made polished hardened Aluminum bowls with high precision ball bearings.  By far the biggest impact on my DAC, but very audible benefits on the server as well.  Interesting to see a commercial option.  After some experimentation, I ended up settling on a shallow bowl (5" diameter).  The Magic Spacers look like they have a much deeper bowl.

 

Looking forward to hearing your findings and following along this project!

 

Hip-joints the Barry Diament's version of a roller-block is made by Ingress 

http://www.ingress-engineering.ca/products-and-services.php

and the area the ball can move is very important, concave and large...

Share this post


Link to post
Share on other sites
On 2/22/2020 at 4:30 AM, rafa said:

I tested 6 different DDR3 RAM modules and agree that it's quality most important.

 

But about timings I have opposed opinion. Maybe that depends on definition, what is "better" ;) 

 

DDR3 RAM?!? You, should have started with that. We have been talking about different memory type then - completely different ways of optimizing the two. 

Share this post


Link to post
Share on other sites

1.8 HDPLEX 400W DC-ATX

 

This well-known DC-ATX converter has also arrived. This device has the task of distributing the 20V input nicely to the Molex-PC connectors in the 12V + 5V + 3V output. This is the preliminary power plan:

 

37940115zk.png

 

The main purpose of our project is to replace the cheap accessories with high quality cables from fis Audio. Bernd already has some ideas.

 

37939946gd.jpeg

Share this post


Link to post
Share on other sites
1 hour ago, elan120 said:

I did a quick bench check on HDPlex 800 DC-ATX unit, when both Group1 and Group2 are connected, Group1 EPS output 12.23V and Group2 EPS output 12.33V, this is a bit over 0.8% of output regulation

 

Thank you for this hint. This is really a problem that concerns me. A Keces P8 with 20V/8A is normally sufficient. The biggest load of my reference audio PC, which also uses an i9-9900K and the HDPlex 800 DC-ATX unit, is 20V/6A if loading komplex filter. Normally only 20V/3A. It is interesting that Group 2 is put under a higher load at the beginning. Later that almost similar between group 1 and group 2.

 

In our project, the second Keces P8 with 12V/8A is optional to have more headroom. In my experience, that promotes sound. The advantage of Keces P8 is the extensive protection:

 

Output voltage 12V
Over Voltage Protection 12.5V
Under Voltage Protection 11.5V

 

If necessary, group 2 is automatically switched off. We will see ...😉

Share this post


Link to post
Share on other sites
15 minutes ago, StreamFidelity said:

The advantage of Keces P8 is the extensive protection

It might be a good idea to check with Keces on this.  One thing to keep in mind is pending on the combinations of power supply output resistance, output voltage from each supply, output current can actually go negative, which is an indication of current flowing directly into output of one of the power suppliers.  Some power supply topologies would be tolerant of such a condition, but many (most?) would not.  The two modes of protections provided by P8 likely don't cover this condition, so to be on the safe side, better check with them whether their power supply has protection to support load sharing.

 

Normally, I try to keep power supply operating at no more than of 75% of its rated output to ensure there is enough headroom, more headroom certainly is better, so hopefully your project will work fine with just a single supply.

 

Share this post


Link to post
Share on other sites
8 hours ago, Nenon said:

This is interesting. In my tests, the EPS connector is the most important to the sound quality. Can you please share what motherboard and CPU your friend used in his testing? I remember that on low powered motherboards the 5V made bigger difference and benefitted by oversizing the power supply a little. The reason for that might be that the oscillators might be using that rail, but that is just a guess. 

Yep - he was using a small server MB, not sure the model but it was one of the small Supermicro server boards....

 

I am using a dual PC setup now, but have enough extra stuff to build up a nice single box for Euphony trial, so am following this closely ... and of course thanks a million for all your posts from the other thread...

Share this post


Link to post
Share on other sites
8 hours ago, Nenon said:

I remember that on low powered motherboards the 5V made bigger difference and benefitted by oversizing the power supply a little. The reason for that might be that the oscillators might be using that rail, but that is just a guess. 

 

 

What makes a motherboard "low powered?"  In my build I am powering the 24pin ATX by using an HDPlex 800W DC-ATX powered by the Keces 20V/8A.  The EPS is powered by a straight run from a 400W HDPlex LPS.  The jcat cards are each powered by separate 5V LPSs.

 


Speakers: Vandersteen Model 7s, 4 M&K ST-150Ts, 1 VCC-5; Amplification: 2 Vandersteen M7-HPAs, CI Audio D200 MKII, Ayre V-6xe; Preamp: Doshi Audio Line Stage v3.0; Phono Pre: Doshi Audio Phono Pre; Analog: Wave Kinetics NVS with Durand Telos composite arm; SME 3012R arm, Clearaudio Goldfinger Statement v2; Reel to Reel:  Technics RS-1500; Doshi Tape Pre-Amp; Studer A810, Studer A812, Tascam BR-20; Multi-channel: Bryston SP-3; Digital: Custom PC (WS 2016/AO/HQPlayer/Roon)> Lampizator Big 7 DAC

Share this post


Link to post
Share on other sites
14 minutes ago, motberg said:

Yep - he was using a small server MB, not sure the model but it was one of the small Supermicro server boards....

 

 

4 minutes ago, dminches said:

What makes a motherboard "low powered?" 

 

I was referring to some tests with the SuperMicro A2SAV-L motherboard, similar to what Innuos uses. 

Share this post


Link to post
Share on other sites
42 minutes ago, Nenon said:

I was referring to some tests with the SuperMicro A2SAV-L motherboard, similar to what Innuos uses. 

 

I see.  I am using what is likely considered a full powered motherboard (Supermicro X11SCH).

 


Speakers: Vandersteen Model 7s, 4 M&K ST-150Ts, 1 VCC-5; Amplification: 2 Vandersteen M7-HPAs, CI Audio D200 MKII, Ayre V-6xe; Preamp: Doshi Audio Line Stage v3.0; Phono Pre: Doshi Audio Phono Pre; Analog: Wave Kinetics NVS with Durand Telos composite arm; SME 3012R arm, Clearaudio Goldfinger Statement v2; Reel to Reel:  Technics RS-1500; Doshi Tape Pre-Amp; Studer A810, Studer A812, Tascam BR-20; Multi-channel: Bryston SP-3; Digital: Custom PC (WS 2016/AO/HQPlayer/Roon)> Lampizator Big 7 DAC

Share this post


Link to post
Share on other sites

It goes on. 👌

 

1.1 HDPLEX 2nd Gen H5 Fanless Chassis

 

The Audio PC case came just right to the workshop with Bernd (fis Audio). When discussing the required internal DC cables, we discussed the position of the installed components and the length of the cables to the Molex sockets. How good that everything is already drawn on the base plate.

 

37953723me.jpeg

 

All required drill holes are absolutely perfect and the right screws and nuts were included. The case itself does not come ready built, but must be screwed together. That was done quickly. We positioned the mainboard and the DC-ATX converter accordingly and were able to determine the cable route and the cable length. The cables will never criss-cross, as is often seen.

 

37953724vv.jpeg

 

Share this post


Link to post
Share on other sites
On 2/21/2020 at 3:13 PM, Nenon said:

 

The 2666MHz Apacer RAM running at 2666MHz sounds better than the 2400MHz Apacer running at 2400MHz or any slower speed. 

 

 

 

I went to Apacer's website and found many choices, Please excuse me if I missed the answer for this question I'm about to ask -   Do you have a Apacer Product part number as per your reference of the  2666MHz Apacer RAM running at 2666MHz ?

 

Thanks

Share this post


Link to post
Share on other sites
14 minutes ago, Linmon said:

Do you have a Apacer Product part number

Here is the Apacer part number:  D31.23185S.001

Share this post


Link to post
Share on other sites
17 minutes ago, elan120 said:

Here is the Apacer part number:  D31.23185S.001

 

 

Thanks, that makes purchasing much easier - I'm sure I would have surely messed this up without the info.

 

 

Share this post


Link to post
Share on other sites
1 hour ago, Solstice380 said:

Someone, not me(!), bought out Mouser’s entire stock of this RAM.  Looks like they have 10-15 sticks on order per month. 

 

The B-st-rds !

Share this post


Link to post
Share on other sites
2 hours ago, elan120 said:

Here is the Apacer part number:  D31.23185S.001

Could you please provide the part number for the equivalent in an 8GB capacity?

Share this post


Link to post
Share on other sites
1 minute ago, lwr said:

Could you please provide the part number for the equivalent in an 8GB capacity?

Sure, I will get that information later when I get home, as I don't have it with me at work.

Share this post


Link to post
Share on other sites
4 hours ago, Nenon said:

This would keep all cables shorter. The downside is that you may need new holes, but I think it's totally worth the effort. 

 

That is a legitimate indication. As a possibility, we want to keep the space on the left free for other modifications.

 

Your power supply with the HDPLEX 800W DC-ATX looks very good! 👍

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...