[regal]

Quote:

I'm sorry Regal, you may need to carry out more research.
 
http://www.edaboard.co.uk/current-output-dacs-t288144.html
 
 
"Current output DACs don't put the "output op amp" on the chip so that you
can select your own output opamp, depending on your bandwidth, noise,
accuracy (dc precision), settling time and power requirements.

When selecting opamps you often trade off bandwidth for DC precision, so you
don't want to select an opamp with excessive bandwidth."
 
Why would there be a need for "DC precision"?

The PCM1704 wants to have no DC present on its output,  this has been discussed many times and is the reason that passive I/V sound poor with this chip.  I have been working with this chip for several years and know its characteristics,  greater than 10 ohms resistance (24mV DC) and you start to have distortion same # was published in the TD1541 datasheet after that it became "assumed.".  The tests have been done by many I believe Swenson was the first to prove it.    It is well known that most i-out DAC's needs a near zero impedance load.  The PCM1704 being R2R and bipolar supplied means its output is at 0V DC and you need to design your analog stage to keep it there,  as the RE1/7 do a very good job at pulling off.   You need to do more research I suggest diyhifi.org (I/V for PCM1704.).

 

[SP Wild]

 
Quote:

You need to do more research I suggest diyhifi.org (I/V for PCM1704.).

 
Fine!
 

 
I'll think about it.
 

 
 
 
 
 
 
 
 

 
 
 

 

[ursdiego]

Now this reply is about my final appreciation of the Ref 9 DAC, as an example of the "musical type" pcm1709 - dac lineup of audio-gd.
 
First of all, hello again, fellows, and have a happy new year!

I own my REF 9 for about two months now, and I thought it was time to give a little update.

However, I start with the questions. I had a short look on audio-gd's website, and it seems, that they change their products and their website really quickly. Most of the "Ref"-Dacs we were discussing about just about a month ago have disappeared, new ones have come...

What I notice, there is no mention anymore about the "musical" lineup (remember? the ones with a neat shining diamond in the output stage ). So what happened there...? Has the discussion about the "diamond" - type analogue stage become purely academical?

However, for me its still relevant, as far as I own one of those "diamond" - dacs. And I must say, things got quite better since my first impressions, I wrote about here. The sound got more relaxed, more natural. The most impressing things are: Detail in general, precise soundstage, good overall timing. Gives the overall impression of hearing the music from a certain distance, like from the most prestigous place for listening to omusic: From the loge.

However, for my very own personal taste, I would still prefer to listen to the music from another place, the one of the conductor... or whatever band member. That means, the sound could be more intimate, closer, more to the front, more insistent.

However, it gets pretty - or too - insistent in one particular setting, that is, listening with high volume to certain female voices or when trumpets are part of the setting. The voice becomes so "crying" that it starts to hurt the ear... certainly not how it it's supposed to sound! Now, is that a flaw of the recording? Of the DAC that reveals it without mercy? Or a flaw of the whole combination of my chain?
 
For an example: Dee Dee Bridgewater from her album Dear Ella, on the beautiful song "Mack The Knife". She starts with a low voice, and the DAC does a wonderful job revealing even very fine details of her voice and the instruments, even on that "only" 16bit/44khz cd rip.
 
Then it gets loud - and it is like Dee Dee is crying directly into your ear, harsh, almost metallic - and brings the immediate need to lower the volume, even if it would be SO nice to hear that part at full power……
 
Does anyone share that experience?

If anyone is interested, I might upload the flac - file of that Dee Dee 's song I mentioned… PM me, I would then send you back a link to the file by PM.
 
Cheers!

 

[realmassy]

Thanks for your comment ursdiego.
I too prefer a more intimate presentation, and I'm not completely sure the Havana I just bought (which is supposed to be a musical DAC) is right on target.
The things you've notice, though could be due to the rest of the chain, not just the dac. What's the rest of your setup?
 
BTW, I'd love to listen to the song you mentioned, and test it my setup.

 

[ursdiego]

Hi again! While writing, I got curious myself and did now a direct comparison of that song between my Creek CD player and the DAC. And the "crying" effect is there on the creek, too. However I still think it's perhaps a bit more exaggerated on the audio-gd dac. BUT Dee Dee actually sings like that - and the setting at the recording or the mixing did probably their part to have that exaggerated effect.
 
And you are right about the rest of the setting. It is a setting made to reproduce everything - the beautiful and the ugly parts of the music, with no mercy and no clouds around the reality. That is how I like my hifi setting to be... It's not a Head-setting though... I use DNM pre- and power amp and Rehdekko speakers. In particular those legendary speakers are well know for revealing just every detail and being extremely direct, fast and precise. In my experience (and within my budget) it is the setup that brings the most "live like" feeling into my living room, and that's what I want  (still preferably with my Reson turntable...). But of course, when a recording is harsh, it will sound harsh on my setup.
 
What about yours?
 
I will send you the link to the Dee Dee file by PM!

 

[haloxt]

Speakers with more mellow highs. I have mirage omd speakers and they have tweeters aimed vertically and they never sound piercing. But they may not be detailed enough for people who love treble. My klipsch have better highs but they are quite piercing and very direct highs.

 

[realmassy]

Quote:

...
And you are right about the rest of the setting. It is a setting made to reproduce everything - the beautiful and the ugly parts of the music, with no mercy and no clouds around the reality. That is how I like my hifi setting to be... It's not a Head-setting though... I use DNM pre- and power amp and Rehdekko speakers. In particular those legendary speakers are well know for revealing just every detail and being extremely direct, fast and precise. In my experience (and within my budget) it is the setup that brings the most "live like" feeling into my living room, and that's what I want  (still preferably with my Reson turntable...). But of course, when a recording is harsh, it will sound harsh on my setup.
 
What about yours?
 
I will send you the link to the Dee Dee file by PM!

Cheers!
I now listen only through headphones, and it's very difficult to find the "right way" to balance detail and musicality, mainly because music is right in the ears. When a recording is particularly harsh it listening to it is too much of a pain. But if the system is too laid back I fall asleep
I use the HD650, driven by the WA3 and the source is now the Havana, NOS with tube buffer.

 

[ursdiego]

[size=12pt]A bit off topic, but talking about “neutral” or “musical” sources, there is a point for comparison: I was impressed by the „plausible“ sound of my new DAC and I did not touch my turntable for a while. However, I switched in on lately… And I don’t know what the hell it is, and I’m not sufficiently fluent in audiophilian language to describe that feeling of mine accurately, but the black disks still bring the live feeling closer to me, even if sometimes some old records crackle e bit. Definitively, even compared with high resolution files. And it was quite a bit cheaper than my digital setup… (including the quite nice mc preamp)… So, there is still room to improve in my opinion. I would be the first one to skip my black disks if files, being more convenient, sound as good…[/size]