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DAC-END R (ES9018) full assembled board

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smoothquark

Member
Joined 2010
audiodesign said:
Do you see the backlight on at the begin with the character ####.... ?
Click to expand...

No backlight at all. I see the characters ### ... then blank. When the power button is pressed on the remote, the DAC powers up. LCD displays USB and volume etc but no backlight on the LCD. DAC works OK but power off on the remote does not work - cannot go back to standby.
 
quanghao

quanghao

Member
Joined 2009
quanghao.com/
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myfavoritething

Member
Joined 2006
Hello Quanghao, did you really mean that this Super V/I is better than active module with opa 627 ? If you, a full set is 405,50 but how to add as I would like to add an Amareno usb module. I hope to find in the packet for LNV and the caps for coax and AES input...
Waiting for a quick answer to take my place in the list.
 
S

smoothquark

Member
Joined 2010
myfavoritething said:
Hello Quanghao, did you really mean that this Super V/I is better than active module with opa 627 ? If you, a full set is 405,50 but how to add as I would like to add an Amareno usb module. I hope to find in the packet for LNV and the caps for coax and AES input...
Waiting for a quick answer to take my place in the list.
Click to expand...

Somehow I missed have missed the price of this. Is it really US$405.50 for a complete pair? Is it that much better than the the present output? Are you able to offer some sort of trade in? I would be interested in this if only to free up some space within my chassis for a cubox and the necessary transformers etc. Probably a stupid question, but can the DAC board be connected directly to a pair of hypex modules?
 
R

randytsuch

Member
Joined 2003
randytsuch-audio.blogspot.com/2005/10/my-system.html
smoothquark said:
Somehow I missed have missed the price of this. Is it really US$405.50 for a complete pair? Is it that much better than the the present output? Are you able to offer some sort of trade in? I would be interested in this if only to free up some space within my chassis for a cubox and the necessary transformers etc. Probably a stupid question, but can the DAC board be connected directly to a pair of hypex modules?
Click to expand...

Not trying to take business away, but you could buy the tx's yourself. I thought they were pretty easy to install since there isn't much to connect.
The German distributor has them for 120e each.

Randy
 
E

ervstil

Member
Joined 2013
Hi!

I am about to get the second version of this dac and I am planning to go unbalanced voltage out straight to the power amplifier. I´m aware of the consensus that transformer is the way to go, but right now I have a limited budget and I have some russian teflons laying around. The plan is as follows:

Reverse dac b and paralell dac a and b.
Implement RC low pass to filter out of band noise.
Implement output high pass filter to block DC from dac.
Connect it directly to the power amplifier.

For low pass I have 2200pf teflons that would give me 72 KHz fc with 1 KOhms or 145 KHz with 500 Ohms.

For high pass I have some 0.47uF teflons with my 100 KOhms impedance it would give me an fc of 3.4 hz.

Is this a good plan? Should I go for a 2nd order low pass filter?

What low pass fc should I aim for?

Does paralleling a and b dacs bring any benefits compared to only use the a dac?

Best Regards Christian
 
R

randytsuch

Member
Joined 2003
randytsuch-audio.blogspot.com/2005/10/my-system.html
ervstil said:
Well, i like to experiment and I do not see any major obvious technical reason for my approach wold not sound more or less as good. Maybe I´m wrong, maybe not. The major drawback would be aprox half the output voltage, but I will crank up the gain of my amp.

B.R Christian
Click to expand...

From what I remember, buried in this thread somewhere, audiodesign described how to do what you want to do.

I believe the newest firmware supports this mode.

In my gut, I think it would be a compromise, but I haven't tried it either.

Good luck.
 
L

linuxfan

Member
Joined 2007
ervstil said:
I am planning to go unbalanced voltage out straight to the power amplifier.
...
Reverse dac b and paralell dac a and b.
Click to expand...
The firmware will do the phase-reversal for you - on the front panel I think you need to press the two side buttons simultaneously.
Andrea (audiodesign) has reported good results with this, using caps as explained here -
audiodesign said:
This evening I have tested the following configurations ...
4) Un-balanced direct connection in voltage mode with only 2.2uF Z-Cap capacitor (0.1uF bypass MKP1837 as option)
Click to expand...

And forum member sipo75 is using unbalanced direct connection, apparently with NO capacitor -
sipo75 said:
I am using this configuration. No filter. Direct out to Symasym. I have changed the output configuration of the DAC to unbalanced out as documented by audiodesign, shorted Out + and -.
Click to expand...
 
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