Hi Kiven,
My family is in Beijing. so can go that route. There are also proxy services here in US that allow US customers to buy stuff from China. So your shipping will be to one of the big cities in China. The proxy agency will usually charge 20% transaction fee. Here's one of them: Taobao FOCUS: Buy from China Taobao.com in English, Taobao agent
My family is in Beijing. so can go that route. There are also proxy services here in US that allow US customers to buy stuff from China. So your shipping will be to one of the big cities in China. The proxy agency will usually charge 20% transaction fee. Here's one of them: Taobao FOCUS: Buy from China Taobao.com in English, Taobao agent
I think you might be correct
I'm running with a volume pot connected, and had issues with the volume flickering between to adjacent settings. I moved the DAC to a full width case over the weekend and changed XLR's to panel mount with Pin 1 tied to chassis. Once I'd done this the volume flicker became very rapid (around 1 second to switch V-35->V-34->V-35) and resulted in clicking in the outputs.
The issue was that the DAM had been relying on the pin1 connection for a gnd reference. When I corrected the Pin 1 problem the board was floating. After running a gnd wire from one of the DAM gnd pins to a star ground the volume flicker stopped.
cheers
Paul
Based on Søren's responses when asked that question by others, I'd be assuming the answer would be "not any time soon". If you read the post linked below Søren's stated intention was to support only DoP, and not DSD.
If you work on that basis you won't be waiting for something that is likely to never eventuate, and if Søren does at some point decide to implement DSD support you'll have a bonus.
http://www.diyaudio.com/forums/vend...-magnitude-24-bit-384-khz-39.html#post4237828
Hi,
didn´t follow the many threads and Blogs for a while, so I´m not familiar with the current state of the DAC project.
Had yesterday the first possibility to listen to the DAC over our big ESL system and in direkt comparison to our Ultimate DAC fitted to our Music Server.
One could hardly find a better tool for evaluation.
The DAC came with the original firmware release (think Rev_0.8??, is it who knows??)
Btw. why is this commercial product still shipped without a decent Manual as it is legally required??
Anyway, my boss told me in before his impressions.
- very detailed and fresh sound, but sticking to the speakers and without focus and anemic lows.
- Left-right channels interchanged
Within a couple of seconds of listening it became obvious that the channels were also out of phase.
After correcting that (using the OPAmp buffer) the DAC sounded very similar to our DAC, which is a BB Sigma-Delta, featuring linear upsampling with own filters, switched clocks, and a analog I/V converter with passive Resistor as IV-converter, and output buffer where the signal is handled without feedback passing just two transistors.
So far the best digital source I heard.
The R2R seemed ever so slightly more detailed and ´clean´, but this impression levelled out when the signal levels were made equal (the R2R is louder)
One could now hardly make out any differences at all in direct comparison.
I got the impression though that the R2R´s slightly greater openness was preferrably with Pop/Rock but a tad too much for classic.
Our DAC didn´t present the details so forward, but more natural.
With the R2R classic sounded like multi-microphone music, the coherence of the orchester suffered a bit.
Admittedly the differences asked for concentrated listening, direct switch over between the candidates and a extremely capable setup.
Sonically both DACs are on par, maybe the R2R a Jota ahead with my preferred music.
Congrats Soeren, that´s quite an achievement
In praxis though there are a couple of serious drawbacks to the R2R.
The reclocking takes way too long -up to several seconds till it locks (M2Tech USB-I2S converter).
That is impractical and unacceptable for a commercial product.
Sören, maybe You should read the clock-flag almost all of the USB-I2S converters offer.
Locking the new clock can then be done within µseconds.
As I learned there´s an earlier firmware Rev_0.9 update.
Though I searched intensively I couldn´t find a list of the corrected, updated and new features of that firmware?
Does it fix the phase issues of the channels?
The Manual and a new firmware release are announced since at least several weeks.
When will they be released and what will be the fixing points?
jauu
Calvin
didn´t follow the many threads and Blogs for a while, so I´m not familiar with the current state of the DAC project.
Had yesterday the first possibility to listen to the DAC over our big ESL system and in direkt comparison to our Ultimate DAC fitted to our Music Server.
One could hardly find a better tool for evaluation.
The DAC came with the original firmware release (think Rev_0.8??, is it who knows??)
Btw. why is this commercial product still shipped without a decent Manual as it is legally required??
Anyway, my boss told me in before his impressions.
- very detailed and fresh sound, but sticking to the speakers and without focus and anemic lows.
- Left-right channels interchanged
Within a couple of seconds of listening it became obvious that the channels were also out of phase.
After correcting that (using the OPAmp buffer) the DAC sounded very similar to our DAC, which is a BB Sigma-Delta, featuring linear upsampling with own filters, switched clocks, and a analog I/V converter with passive Resistor as IV-converter, and output buffer where the signal is handled without feedback passing just two transistors.
So far the best digital source I heard.
The R2R seemed ever so slightly more detailed and ´clean´, but this impression levelled out when the signal levels were made equal (the R2R is louder)
One could now hardly make out any differences at all in direct comparison.
I got the impression though that the R2R´s slightly greater openness was preferrably with Pop/Rock but a tad too much for classic.
Our DAC didn´t present the details so forward, but more natural.
With the R2R classic sounded like multi-microphone music, the coherence of the orchester suffered a bit.
Admittedly the differences asked for concentrated listening, direct switch over between the candidates and a extremely capable setup.
Sonically both DACs are on par, maybe the R2R a Jota ahead with my preferred music.
Congrats Soeren, that´s quite an achievement
In praxis though there are a couple of serious drawbacks to the R2R.
The reclocking takes way too long -up to several seconds till it locks (M2Tech USB-I2S converter).
That is impractical and unacceptable for a commercial product.
Sören, maybe You should read the clock-flag almost all of the USB-I2S converters offer.
Locking the new clock can then be done within µseconds.
As I learned there´s an earlier firmware Rev_0.9 update.
Though I searched intensively I couldn´t find a list of the corrected, updated and new features of that firmware?
Does it fix the phase issues of the channels?
The Manual and a new firmware release are announced since at least several weeks.
When will they be released and what will be the fixing points?
jauu
Calvin
Hi Calvin,
I am just wondering too
Consider to load Paul's FIR filter.. located in a separated main thread... overshot tests and various filter designs with listening tests..
Well, many recordings are out of phase recorded, mainly hear able for frequencies above 2..4 kHz where the dominated instrument is playing.. it requires a very good amp and speaker system and cable with good low level resolution. Just Google on this matter.
In other words it's a requirement to have a 180 phase switch ON BOARD
Hp
why is this commercial product still shipped without a decent Manual as it is legally required??
I am just wondering too
Consider to load Paul's FIR filter.. located in a separated main thread... overshot tests and various filter designs with listening tests..
Well, many recordings are out of phase recorded, mainly hear able for frequencies above 2..4 kHz where the dominated instrument is playing.. it requires a very good amp and speaker system and cable with good low level resolution. Just Google on this matter.
In other words it's a requirement to have a 180 phase switch ON BOARD
Hp
Hi,
I never cared about that, since You can´t tell the phase orientation of the recording anyway.
The phase inversion I mentioned is between the two stereo channels, which leads to a thinned out sound, without focus.
jauu
Calvin
I haven´t heard differences wether the absolute phase was 0° or inverted.
I never cared about that, since You can´t tell the phase orientation of the recording anyway.
The phase inversion I mentioned is between the two stereo channels, which leads to a thinned out sound, without focus.
jauu
Calvin
Based on Søren's responses when asked that question by others, I'd be assuming the answer would be "not any time soon". If you read the post linked below Søren's stated intention was to support only DoP, and not DSD.
If you work on that basis you won't be waiting for something that is likely to never eventuate, and if Søren does at some point decide to implement DSD support you'll have a bonus.
http://www.diyaudio.com/forums/vend...-magnitude-24-bit-384-khz-39.html#post4237828
Thanks spzzzzkt reply
I believe this is same thing.
dam1012 support input from SPDIF, I2S and USB (via USB to I2S interface board).
SACD/DSD is Bit Stream format while CD is PCM Audio Data.
Up to now dam1012 only support PCM Audio Data up to 384KHz.
DoP means DSD audio Over PCM, it just method for transferring DSD Audio over PCM Frames.
While DSD means Direct Stream Digital. Its data is in Bit Stream format.
So DoP and DSD are talking two different things.
To support bit stream audio in full. Two elements should be included.
1. Support DSD bit stream audio decoding
2. Support DoP, no matter I2S, SPDIF
Many USB DDC such as Amanero Combo 384 already support DoP.
Once dam1012 support DSD bit stream audio decoding. Amanero Combo 384 can provide DSD ON identifier signal help dm1012 identify data format (Bit Stream or PCM). It forms complete DSD decoding solution in DoP.
On the other hand, support DoP via SPDIF of dam1012 still unknown.
This format already supported by some SACD Player/ DAC such Playback Design MPS5 and Bricasti Design M1. Hope dam1012 will support these latest format..
Whenever I read the comments of those who are concerned about legally required manuals for circuit boards I cannot help but be disappointed when the note does not include a complaint about the cost of shipping to Cyprus.
Maybe it was an oversight?
I would tend to think anyone who thinks polarity differences are inaudible may be wasting their time with this DAC. There are plenty of other DACs on the market that would not reveal the difference so those might be a better choice? Might even come with an EU approved manual and sticker? Now that's important.
To assume that because one cannot detect a difference that this perception is shared by all listeners is ... well, I will stop now.
Maybe it was an oversight?
I would tend to think anyone who thinks polarity differences are inaudible may be wasting their time with this DAC. There are plenty of other DACs on the market that would not reveal the difference so those might be a better choice? Might even come with an EU approved manual and sticker? Now that's important.
To assume that because one cannot detect a difference that this perception is shared by all listeners is ... well, I will stop now.
Interesting.... Can anyone confirm this? Not by listening, but by playing a mono sine wave or something and confirming that L/R channels are out of phase (relative to each other) with a scope? How can that have slipped by without being noticed until now?
EDIT: Would explain many of the comments about a "bass light" sound.....
Interesting.... Can anyone confirm this? Not by listening, but by playing a mono sine wave or something and confirming that L/R channels are out of phase (relative to each other) with a scope? How can that have slipped by without being noticed until now?
EDIT: Would explain many of the comments about a "bass light" sound.....
I just checked, in case something went wrong between my initial test and the release:
Testing both I2S and SPDIF, with 1 sample repeating positive pulse, on my Tek DPO-4034:
Both channels in correct polarity and with exact same phase and delay.
So your problem are probably elsewhere, the dam1021 have this habit of exposing even the smallest weakness....
Have you listened for differences in absolute phase using the DAM1021. You might be surprised.
Out of phase channels
Some of the reported phase problems between channels may be due to mislabeled J8 output connections on the diagram posted in #901. Both output lines there are labeled CH2+, so it is easy to mix them up. CH2- pin is the one towards the edge of the board. The polarities of the balanced output pins are the same for both channels, unlike the SE outputs, which are mirrored. With J8 being mislabeled, it is intuitive to assume the balanced output connectors are also mirrored and to connect them out of phase.
Some of the reported phase problems between channels may be due to mislabeled J8 output connections on the diagram posted in #901. Both output lines there are labeled CH2+, so it is easy to mix them up. CH2- pin is the one towards the edge of the board. The polarities of the balanced output pins are the same for both channels, unlike the SE outputs, which are mirrored. With J8 being mislabeled, it is intuitive to assume the balanced output connectors are also mirrored and to connect them out of phase.
r12343
Because it is not hawking on Taobao, the first production of PCB was done by my friends, you can just have a few more days.
Hi,
@rick Maybe one hears differences in absolute polarity, maybe not.
I don´t thinl that there´s a single statistically serious test that verifies the audability of absolute phase.
And even if it were so that someone could tell the absolute polarity in a statistically relevant amount of tests, with the next Album title the phase could be inverted again.
So, if one likes to repeatedly switch over while listening to the music, well that´s fine. Others don´t care or are to lazy for that.
I´ve more than 30years of listening experience and a top notch setup at hand for evaluation and have proven to design excellent sounding stuff.
So please put off that arrogant attitude.
@clivem and Soekris: I just checked the connectors this morning, and indeed my boss made a failure. He first listened to direct out (J7) and had never reported about phase issues, but just some minor sonic effects which were related to impedance matching to the passive Preamp.
He changed the cable connectors 1:1 to the Buffer Outs (J6 and J8) a couple of days ago and had the described sonic effects.
He simply missed that he had to turn around the connector for J8, which he he did, probabely 5 seconds after my first listening to the DAC.
I had written the thread with the assurance of him that everything was connected properly in first place.
Sorry for causing this stirrup.
Fazit: If You want it done properly do it yourself
jauu
Calvin
@rick Maybe one hears differences in absolute polarity, maybe not.
I don´t thinl that there´s a single statistically serious test that verifies the audability of absolute phase.
And even if it were so that someone could tell the absolute polarity in a statistically relevant amount of tests, with the next Album title the phase could be inverted again.
So, if one likes to repeatedly switch over while listening to the music, well that´s fine. Others don´t care or are to lazy for that.
I´ve more than 30years of listening experience and a top notch setup at hand for evaluation and have proven to design excellent sounding stuff.
So please put off that arrogant attitude.
@clivem and Soekris: I just checked the connectors this morning, and indeed my boss made a failure. He first listened to direct out (J7) and had never reported about phase issues, but just some minor sonic effects which were related to impedance matching to the passive Preamp.
He changed the cable connectors 1:1 to the Buffer Outs (J6 and J8) a couple of days ago and had the described sonic effects.
He simply missed that he had to turn around the connector for J8, which he he did, probabely 5 seconds after my first listening to the DAC.
I had written the thread with the assurance of him that everything was connected properly in first place.
Sorry for causing this stirrup.
Fazit: If You want it done properly do it yourself
jauu
Calvin
Hi there,
Hoping someone can point me in the right direction.
I have been following this thread for some time and about to start my first build. Quite exciting! I think I have everything I need to get things going but need to know the technical name for the cables / connectors that many people are using for their input and output stages? I think it's a 2.54 pitch header but not sure on which sockets to order that connect into them? Sorry if this is a newby question! Any links to an Australian site like element14 would be great.
Thanks
Sam
Sent from my iPad using Tapatalk
Hoping someone can point me in the right direction.
I have been following this thread for some time and about to start my first build. Quite exciting! I think I have everything I need to get things going but need to know the technical name for the cables / connectors that many people are using for their input and output stages? I think it's a 2.54 pitch header but not sure on which sockets to order that connect into them? Sorry if this is a newby question! Any links to an Australian site like element14 would be great.
Thanks
Sam
Sent from my iPad using Tapatalk