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iFi iDSD - no1 seller in Japan! XMOS software notes as you guys asked. - Page 2

post #16 of 46
Thread Starter 

Hi,

 

Nice spot.

 

Corrected to 48!

 

thanks


Edited by iFi audio - 12/31/13 at 1:44am
post #17 of 46
Thread Starter 

Also:

 

DSD could be stored as DoP encoded 176.4KHz FLAC or WAV files and then played back as DSD.

 

However, there is currently no software to support such a conversion, as far as we know (may change anyday though), in which case DSD may also be sent via SPDIF connection to DACs that can decode DoP via SPDIF.

 

This way even non-DoP compliant software can play DSD.

 

thanks

post #18 of 46

Suspect it's a PCM179x DAC. Nice chip choice if so and pricing seems very reasonable. Would be nice if it also had SPdif in but can't have everything at a low price. I think more important than a well chosen DAC is how Jitter is controlled at the input. Is there significance to the 3.0 input and does it also charge via its USB? The filter switch is cool so folks can hear the effect but I suspect everybody will use minimum (slow) unless they need a bit more etch.

post #19 of 46
Thread Starter 
Quote:
Originally Posted by goodvibes View Post
 

Suspect it's a PCM179x DAC. Nice chip choice if so and pricing seems very reasonable. Would be nice if it also had SPdif in but can't have everything at a low price. I think more important than a well chosen DAC is how Jitter is controlled at the input. Is there significance to the 3.0 input and does it also charge via its USB? The filter switch is cool so folks can hear the effect but I suspect everybody will use minimum (slow) unless they need a bit more etch.

 

It is new year's eve so how about a teaser?

 

The BB DAC Chip we use is from the Burr Brown DSD chipset range (ie: not PCM range).

 

So when playing DSD, we have a straightforward DSD DAC. As these DSD DACs were however intended primarily for Multiformat (DSD and DVD-A) Players it also handles PCM with aplomb. Internally, this DAC may be seen as a combination of the DSD1700 for the DSD part and the PCM-69 for the PCM part, all on one chip and fitted with an optional digital filter for PCM.

 

This is VERY different from the majority of more modern DSD capable Chips which convert DSD first to PCM, apply processing (digital filters, digital domain volume control etc.) and the replay this converted PCM via a Hybrid DAC.

 

The iDSD can PLAY ANY format and the listener will HEAR EVERYTHING the chosen format has to offer, without format conversion losses, multiple format conversions causing more losses etc.

 

The iDSD has already has quite a bit of attention to jitter and related issues. We have discrete crystal clocks for each sample rate directly driving the DAC, so jitter is pretty much as low as can be. Not something we talk about much because paying strict attention to this is par for the course for us.

 

Also, yes - it charges via the USB port - depending on the power on sequence, the user chooses to run on battery power or USB power.

 

thanks


Edited by iFi audio - 12/31/13 at 8:35am
post #20 of 46
Quote:
Originally Posted by goodvibes View Post
 

Suspect it's a PCM179x DAC. Nice chip choice if so and pricing seems very reasonable. Would be nice if it also had SPdif in but can't have everything at a low price. I think more important than a well chosen DAC is how Jitter is controlled at the input. Is there significance to the 3.0 input and does it also charge via its USB? The filter switch is cool so folks can hear the effect but I suspect everybody will use minimum (slow) unless they need a bit more etch.

 

I too wonder which DAC it is. PCM1795 will do 32bit and DSD/DXD, but that sampling rate is limited to 192kHz IIRC. PCM51xx will do 32/384, but none of them does DSD/DXD. Just saw the above that it is a DSD series.


Edited by ClieOS - 12/31/13 at 6:50am
post #21 of 46

I am awaiting my iDSD that I ordered about a month ago, the dealer had not received the units, but now it's finally on its way to me.  I am very excited to test it out as I have high hopes that it will become my new DAC Road Warrior, given that it has its own battery power.  I'm looking forward to comparing it to my Meridian Explorer with PCM material.  And I have also recently purchased some DSD titles which sound fantastic through Audirvana DSD to PCM conversion in my Mac Mini, so I'm really looking forward to listening to this material on the iDSD, which of course has native DSD capabilities.

 

My planned use is mostly on the road using my iPad as the source, but the iDSD offers so much more on paper that it might become much more if the performance and sound quality is right...

 

Would the iDSD require a powered hub to work with the iPad+CCK, or can it just work in this configuration through its internal power source?

post #22 of 46
Quote:
Originally Posted by iFi audio View Post
 

 

It is new year's eve so how about a teaser?

 

The BB DAC Chip we use is from the Burr Brown DSD chipset range (ie: not PCM range).

 

So when playing DSD, we have a straightforward DSD DAC. As these DSD DACs were however intended primarily for Multiformat (DSD and DVD-A) Players it also handles PCM with aplomb. Internally, this DAC may be seen as a combination of the DSD1700 for the DSD part and the PCM-69 for the PCM part, all on one chip and fitted with an optional digital filter for PCM.

 

This is VERY different from the majority of more modern DSD capable Chips which convert DSD first to PCM, apply processing (digital filters, digital domain volume control etc.) and the replay this converted PCM via a Hybrid DAC.

 

The iDSD can PLAY ANY format and the listener will HEAR EVERYTHING the chosen format has to offer, without format conversion losses, multiple format conversions causing more losses etc.

 

The iDSD has already has quite a bit of attention to jitter and related issues. We have discrete crystal clocks for each sample rate directly driving the DAC, so jitter is pretty much as low as can be. Not something we talk about much because paying strict attention to this is par for the course for us.

 

Also, yes - it charges via the USB port - depending on the power on sequence, the user chooses to run on battery power or USB power.

 

thanks

Love that it's native for both formats and an outboard filter for PCM. You can do a lot with that and the oversampling.:bigsmile_face: I'm still a PCM guy but like things played in their native formats whatever that is. Still wish it had SPdif in but it's already got a lot for the price and it's well suited to the intended market. Happy New Year!

post #23 of 46
Quote:
Originally Posted by ClieOS View Post
 

 

I too wonder which DAC it is. PCM1795 will do 32bit and DSD/DXD, but that sampling rate is limited to 192kHz IIRC. PCM51xx will do 32/384, but none of them does DSD/DXD. Just saw the above that it is a DSD series.

To the stuff that you crossed out. I don't know how modular the 1796 is but you can often get these chips to do higher rates with a bit of outboard massaging though I wouldn't expect it at this price. Miss on my part and good catch.

post #24 of 46
Thread Starter 
Quote:
Originally Posted by ticos442 View Post
 

Would the iDSD require a powered hub to work with the iPad+CCK, or can it just work in this configuration through its internal power source?

Hi,

 

No powered hub or such required.

 

iPad > CCK > iDSD (running on internal battery).

 

But when you are back at base, the iDSD can also run on USB power (alternate between USB power/battery based upon switch on procedure).

 

So for best sonics, one can opt for battery or partner up with the iUSB Power supply (which is pretty darn quiet).

 

thanks

post #25 of 46
Quote:
Originally Posted by iFi audio View Post
 

Hi,

 

No powered hub or such required.

 

iPad > CCK > iDSD (running on internal battery).

 

But when you are back at base, the iDSD can also run on USB power (alternate between USB power/battery based upon switch on procedure).

 

So for best sonics, one can opt for battery or partner up with the iUSB Power supply (which is pretty darn quiet).

 

thanks


Thanks so much - I am even more excited by this response!

 

I also already own the iFi iUSB power supply, which is right now sitting in my home configuration between my Mac Mini and the Meridian Prime DAC/Headphone amp.  The results with the iFi iUSB Power have been outstanding - I am very impressed with this device and the marvels it does to clean up the USB data and power.  I believe that this is still one of the best kept secrets out there, many audiophiles can benefit from using this unit if they have USB based DACs.

post #26 of 46

I got mine today.  I have posted my first impressions in other threads, but wanted to provide feedback directly to iFi Audio here:

 

Even though I got it to be my portable DAC to play high resolution files from my iPad, I am currently in the burn-in phase, connecting it this way:

Mac Mini -> iFi iUSBPower -> iFi iDSD -> RCA output to Yamaha amplifier.    I'm using Audirvana to play high rez files up to 24/192 and DSD files through Audirvana.  It sounds terrific even out of the box without any burn-in time.

 

For the portable configuration, I performed some tests this afternoon and got pleasantly great results:

1.  Works perfectly just connecting the iDSD to the iPad using CCK

2.  No need for Powered Hub at all

3.  The iDSD has a led light with colors that show the specific frequency, similar to the Dragonfly.  It has different lights for 1X (44.1, 48), 2X (88.2, 96) and 4X (176.4, 192), as well as different colors for DSD content at different frequencies:  DXD 353/384Mhz, DSD 2.8/3.1Mhz and DSD 5.6/6.2 MHz.  I actually did not know that there was a led light with changing colors at all - it was a nice surprise when I got the unit and read the instructions - this is something that could be marketed better by iFi!

4.  I played content in all different formats and frequencies above in my iPad and got the right results - bit perfect every time.  Used the FLAC app for PCM content and the Onkyo HF Player for DSD content.  I selected the option to play DSD directly without any PCM conversion.

So far this little technology marvel will be my travel companion as it does not require the USB Powered Hub as it has its own internal battery, supposed to last 10 hours.

 

Simply amazing for its price!

post #27 of 46
Hey ticos442,

thanks for your feedback, I have few questions
- does it hiss with sensitive IEMs when idxd is used as dac-amp combo?
post #28 of 46
Quote:
Originally Posted by jared basshead View Post

Hey ticos442,

thanks for your feedback, I have few questions
- does it hiss with sensitive IEMs when idxd is used as dac-amp combo?

I have tested it with all my IEMs and cans using the iPad+CCK as the source.  The most sensitive IEMs I have are the Monster Turbine Pro Copper and the Monster Miles Davis.  Sound quality is superb and background is ultra quiet.  When you pause the music you can't hear anything at all (no hissing or other electronic noise artifacts), and when playing soft music or quiet passages in a song, there is no noise present whatsoever.  The only hissing I hear is the one coming from older recordings (the tape hiss from the masters when the music was recorded), which is normal.

 

The iDSD also performs admirable with my full size Ultrasone8 headphones.  It works with my very hard to drive Grado PS1000s, but I need to crank up the volume pretty high, and the performance is not the same as using more powerful headphone amplifiers.  Again, this is normal and I was not expecting to use the iDSD with its internal battery source with my Grado headphones.

 

In summary - I am extremely impressed!

post #29 of 46
Hey, thanks for the response. Looks like this is going to be my next buy, hope it will be a upgrade to E7.

Also, where did you get it and for how much, you could pm me if you want.
post #30 of 46
Quote:
Originally Posted by jared basshead View Post

Hey, thanks for the response. Looks like this is going to be my next buy, hope it will be a upgrade to E7.

Also, where did you get it and for how much, you could pm me if you want.


I got it from musicdirect.com, $189 and free shipping. 

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