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AK4490 USB Dac with dsd support.

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#585
sonnya said:
For this weekend.. .

New DAC Mainboard with SPDIF support:
We will on monday order Mainboards with SPDIF 1 RCA and 1 Optical and a I2S port. It is based around TI SRC4392 as we can make the SRC4392 slave of the masterclock.

BR

Sonny
Click to expand...


Sonny,

For us that already has the DAC, will there be an upgrade path ex. attach an add on board for the SPDIF and I2S?

Sent from my SM-N9005 using Tapatalk
 
#586
Sonny, I am running Runeaudio on pi2->ak4490-> integrated amp (CD input) - > speaker.
So far so good and sound excellent on my system. Hearing a lot of details I have not heard before this, although I have to admit I don't have much experience with high end DAC.

Question.
In setting volume control to "hardware" or "disabled" on Runeaudio, the output level from the discrete shield is very loud. I only need to turn the volume just slightly and it is already very very loud. Anyway to reduce the output level from the o/p discrete shield?

Feedback:
Updated the latest firmware, still can hear loud clicks at the start of DSD files.


Sent from my SM-N9005 using Tapatalk
 
Last edited:
#588
aradan said:
tyman63

You should be using a preamp. The shield is designed to give fixed output.

The volume control is usually managed by a pre amp.
Click to expand...


He already has an integrated amp. So using another preamp isn't required. There's simply too much gain because his integrated is probably designed for a standard 2v input. There may be a resistor that can be changed to lower the gain. But Sonny will have to chime in with that answer.
 
#590
ijscobar said:
Perhaps use a resistor network between dac and (pre) amp?

T-Pad / H-Pad Calculator - Resistor Values for Attenuation
Click to expand...


It's probably best to just replace the right resistor on the board instead. Sonny will have the best answer. He's likely going into the single ended input on the integrated. Usually the single ended outputs on most DAC's have half the output level as the Diff outs. But this is not the case with the discrete output shield. They both have equal output of 4.6v I believe.
 
#592
aradan said:
Bavmike

You are indeed right, but this would be true for any dac which has a buffer. Usually buffer is giving some gain.

Might be my bad in this case of it has a buffer already why not to use a volume pot following the dac. Although personally suggest a pre amp.

Based on tyman63 set up it looks like he is going to use his source as a volume controller which is an option as well.

But the best is always good old mechanical volume pot with buffer or without. Otherwise you are risking to complicate the things much more


We have two ways here. To match the set up with a common one.

Dac, pre amp, amp.

Or try to adjust the current hardware part to correspond to the non standard set up. The choice is yours

Sent from my ONE A2003 using Tapatalk
Click to expand...


But his integrated amp has a preamp and volume control built in already. He doesn't require 2 preamps in the audio chain. So the best thing would be to lower the gain of the discrete output shield to around 2-2.3v. This way it will match up perfect with his integrated amp.
 
#598
Chassis preview.

Hi Guys and Girls.

Have a look

BR

Sonny
 

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