Lampizator R2R PCM vs PCM Up Sampled to DSD

See the options, don't think there are two types.

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Mivera Audio said:
If I understand correct, the original PCM DAC was delta sigma, then an R2R was released, now another delta sigma version was released. It will be interesting to see this new board. I wonder if it has an AK4490 on it? Unless he already has a new DAC built with the Sabre pro chips.
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This sounds right to me. Perhaps Norman will verify it.

Ken
 
Alpinist said:
This sounds right to me. Perhaps Norman will verify it.

Ken
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The détails are right from what I know, as for chips used, Lukasz never says, so pointless to speculate.

As he says, no one asks which battery is used in a cellphone, so...
 
deuter said:
Thanks, has anyone compared the two?
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Lukasz has and says they are very close, each advance can cause them to change relative ranking. A sonic arms race.

Some chips are multibit (AD1865/BB1704, etc), but R2R is indeed resistor ladder and is by definition also multibit.
 
wisnon said:
The détails are right from what I know, as for chips used, Lukasz never says, so pointless to speculate.

As he says, no one asks which battery is used in a cellphone, so...
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It's the output stage where the "Lampi magic" occurs anyways. Speaking of cellphone, I'm curious how the analog outs from my iPhone would sound if ran through a DHT based output stage :)
 
The iPhone has a great Dac chip in it!

No, you have it wrong, the Delta sigma PCM board also has magic in it too...hence why it is giving the R2R a run for its money. 5 year daily tweaking by a electronics geek can get you there.
 
wisnon said:
The iPhone has a great Dac chip in it!

No, you have it wrong, the Delta sigma PCM board also has magic in it too...hence why it is giving the R2R a run for its money. 5 year daily tweaking by a electronics geek can get you there.
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Probably the AK4490 with the "velvet sound" filters. They do sound nice and probably right up Lukasz's alley.
 
Dunno, but Lukasz has a dedicated Digital geek he took on a year or so ago. The guys spends every day refining his digital designs. it a pcb not just a chip!
 
wisnon said:
Dunno, but Lukasz has a dedicated Digital geek he took on a year or so ago. The guys spends every day refining his digital designs. it a pcb not just a chip!
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Of course there's more to the DAC board than just the chip, but not a whole lot as the USB interface is external and so is the output stage. The SDM/SRC algorithms in the chip have a huge impact on how it will sound. As of today until the AK4497 is released, the 3 best SDM chips are:

AKM4490
ESS 9028 Pro
ESS 9038 Pro

The 9038 Pro is going to be rocking the DAC world by RMAF. It's going to make manufactures of sub $20K R2R DAC's weap :)
 
I heard there is a new R2R DSD on the lampi which is mind blowing, much better. Audiophile Bill got one...and I will upgrade too.
 
bonzo said:
I heard there is a new R2R DSD on the lampi which is mind blowing, much better. Audiophile Bill got one...and I will upgrade too.
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My lite 7 was built earlier this month and has the new 256 DSD engine.
 
There is no chip based R2R Lampizator as per my understanding.
The only options are Delsta Sigma PCM and discrete R2R.
 
i can not understand why up sampling should better audio quality - like making a 480x640 pixel picture bigger with photoshop; that does not make it sharper either.

am i missing something here? please explain. thanks a lot.
 
tube-vds said:
i can not understand why up sampling should better audio quality - like making a 480x640 pixel picture bigger with photoshop; that does not make it sharper either.

am i missing something here? please explain. thanks a lot.
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In the case of the Lampi, you are using a DAC with a more direct path with less processing when you upsample the PCM to DSD. But the end result is dependant on how good the upsampling/modulator algorithms are in the software you use. If you use Jriver, you will get mediocre results. HQplayer is the software to use if you want to do this. There's nothing else that can touch it. Drawback is it's very CPU intensive.
 
tube-vds said:
i can not understand why up sampling should better audio quality - like making a 480x640 pixel picture bigger with photoshop; that does not make it sharper either.

am i missing something here? please explain. thanks a lot.
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What happens is yen PCM is changed to DSD and conversion of DSD to analog is very simple compared to PCM and hence better sound.
 
bonzo said:
I heard there is a new R2R DSD on the lampi which is mind blowing, much better. Audiophile Bill got one...and I will upgrade too.
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Strange. I think R2R assign voltage value according to bit value. However DSD is 1 bit stream. Unless it convert DSD to PCM first which seems odd. I could be wrong though.
 
thanks for the info - i'll visit the lampi stand in munich next week and give it a try to my ears.
 
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