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Old 27th August 2012, 08:12 AM   #1801
dhbiker is offline dhbiker  Slovenia
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hi there

on linux i can get it down to 1.33 msec ... but that depends on the kernel... OS... etc
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Old 27th August 2012, 05:13 PM   #1802
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Anybody can tell me about 2 of those at the same time for 4 output and on windows 7 64bit.. what is the lowest latency...
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Old 27th August 2012, 09:45 PM   #1803
1audio is offline 1audio  United States
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Latency? Why is this important? If you have multiple devices they will never be in sync from the USB interface. The big nightmare is that they will change every time you start the system. You need a hardware workaround or a multichannel USB device to overcome that problem.

The AK4430 is giving me exceptional performance. It has a few weaknesses both measured and sonically but you will be 10X to 30X the cost to get a small improvement.

There are far more important issues in getting the performace from the system. You need a well isolated source because the ground of the audio output is the same as the PC and thus noise can be coupled. You should have a well isolated low leakage supply or battery powered source to start with. Then the noise on the USB power can also get coupled through so it should also be low noise. These issues will easily dominate the performance of any DAC in this application.

I have a bunch of measurements that give a picture of this I'll post in the next few days.
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Last edited by 1audio; 27th August 2012 at 09:48 PM.
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Old 28th August 2012, 04:03 AM   #1804
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Quote:
Originally Posted by borges View Post


BÝrge

@Borge,

I am not a big of reviewer , but your DAC has made me fall in love with Music more.

My simple review is for me this DAC beats anything with windows 7 on ASIO drivers with foobar.

used it on linux with ALSA and 24 48 and no way what i heard on foobar...

for me windows 7 with foobar and ASIO this DAC freaking ROCKS...it made me put my peachtree DEcco2 dac to put it on sale...


V
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Old 28th August 2012, 08:36 AM   #1805
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Quote:
Originally Posted by thisisvv View Post
@Borge,

I am not a big of reviewer , but your DAC has made me fall in love with Music more.

for me windows 7 with foobar and ASIO this DAC freaking ROCKS...it made me put my peachtree DEcco2 dac to put it on sale...

V
Feedback such as this gives us much encouragement to continue to improve our designs :-)

Ultimately all our work is for enjoyment of music

Alex
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Old 28th August 2012, 01:02 PM   #1806
MrSlim is offline MrSlim  Canada
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Quote:
Originally Posted by audiolic View Post
Anybody can tell me about 2 of those at the same time for 4 output and on windows 7 64bit.. what is the lowest latency...
If you need more than 2 channels in a USB-I2S converter, the exaU2I is one of the few that can deliver more(up to 8 at 192Khz).

It's also 2.5X the price, requires it's own ASIO driver, is not Open Source, and does not currently have a Linux driver.

Audiolic, it sounds like you are looking for the Holy Grail. Maybe you need to relax and enjoy the music, you might have already found your personal Grail
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Old 6th September 2012, 10:28 PM   #1807
johnm is offline johnm  United Kingdom
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Long shot I know, but has anybody got a spare AB1.1 back panel for the Audio Widget? I screwed mine up whilst attempting to widen the phono sockets (grrr!).

On a different more positive note, finally got around to building a 5V Salas Shunt Reg, and hooked it up to the AB1.1. This DAC sounds surprisingly good with the stock USB provided volts. But really opens up and sounds utterly beguiling and powerful with the external PSU. Played about with the voltages a little (within reason!) and found AB1.1 sounds better at 5.5V. Decided that was a little too close to the maximum limit, and dropped this down to just under 5.4 volts. Been running for 4 days like that now and all is well, and it sounds fantastic!

Cheers,

- John

(Have already asked BÝrge re. spare back panel but I don't think he has any alas).
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Old 12th September 2012, 02:48 PM   #1808
borges is offline borges  Norway
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Default Noise reduced - please test

I have significantly reduced Audio Widget noise on my system. Please test the updated firmware on UAC1/2 using all modes, platforms and players and report any noise. Does the ADC subsystem still work? The firmware branch audio-widget-experimental has been updated with new source code.

audio_widget_ex_20120912.elf - sdr-widget - Noise significantly reduced - Audio and Control Interface for Amateur Radio SDR and Audiophile USB-DAC - Google Project Hosting

Status:

* The foobar2000 time-bar pull noise was reduced by forcing left samples to be written to addresses with LSB=0. (uac2_device_audio_task.c:462) A very busy ASIO driver with much debug information being printed may have masked out this bug by starting the music stream late. The same is probably the cause on other OSes / players.

* A similar bug was found in the UAC1 code (uac1_device_audio_task.c:400), so please test UAC1 as well. I do not know if it is also present in hpsdr_device_audio_task.c.

* Mid-music noise is presumably because a feedback update is missed by a busy task on the host computer. To try to safeguard against this I have introduced two layers of feedback into UAC2. (uac2_device_audio_task.c:331)

Programmers, please give your opinion on this change. Summary:
The old "gap" limit of SPK_BUFFER_SIZE/2 for changing FB_rate has been halved in order to make new _inner_ bounds. Within these narrower bounds the feedback system should work as before. However, should "gap" exceed these inner bounds (during startup or due to missed feedback), the bounds from existing code kick in, this time changing FB_rate by +- 2*FB_RATE_DELTA. I was able to separately test both the new inner bounds and the new double FB_rate. However, it is hard to test the combination of the two. That's why I ask you to test the updated FW with UAC2.

BÝrge

Last edited by borges; 12th September 2012 at 02:50 PM.
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Old 12th September 2012, 05:30 PM   #1809
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Dear Borge,
First of all, congratulation for your work, i am impressed by your dedication and knowledge, please keep up, you are doing a very good job!


I am interested in purchasing a AB-1.2 USB DAC, the only problem i have is the mini B USB input, is there any way to change mini B USB input to USB B BUS ?
I have a very hi quality USB B BUS cable already and i hope i do not need to change this cable for AB-1.2 USB DAC, maybe is another method for me to enjoy listening music thru your DAC.


Thank you for your time!
Have a nice evening !


Best Regards,
Valeriu
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Old 12th September 2012, 08:27 PM   #1810
dhbiker is offline dhbiker  Slovenia
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Borges

works fine on linux with mpd and DeaDBeeF
i noticed a bit more details not sure if its placebo or not

anyways good work
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