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Old 30th April 2013, 01:48 AM   #301
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Not knowing that this thread existed (haven't spent much time here lately), I ordered a DAC last Friday and it arrived today! The USPS sure is fast these days. Anyway, it's only been running for ~2 hours so far but I'm slightly disappointed that there is still a noticeable noise floor. This isn't my main system but was hoping that it'd kill the noise from the motherboard's output. I'll fool around with cables, placement, and different ports later, but for now that's the only issue...running WASAPI and priority via Foobar, lossless and 24/96 files sound great.
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Old 30th April 2013, 02:06 AM   #302
uncola is offline uncola  United States
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EvilYoda I'm surprised to hear that because my hifimediy dac had a black noisefloor.. but when I upgraded to an aune t1 dac/amp, I get a very slight hum.
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Old 30th April 2013, 03:19 AM   #303
uncola is offline uncola  United States
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You could always try a pci-e usb port card if you're using a desktop
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Old 30th April 2013, 03:27 AM   #304
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Default Try the UAE23+

Quote:
Originally Posted by EvilYoda View Post
Not knowing that this thread existed (haven't spent much time here lately), I ordered a DAC last Friday and it arrived today! The USPS sure is fast these days. Anyway, it's only been running for ~2 hours so far but I'm slightly disappointed that there is still a noticeable noise floor. This isn't my main system but was hoping that it'd kill the noise from the motherboard's output. I'll fool around with cables, placement, and different ports later, but for now that's the only issue...running WASAPI and priority via Foobar, lossless and 24/96 files sound great.
The UAE23+ has the USB isolation chip. I have not reverse-engineered that unit because I do not own one. Clean external power can be injected... it has lots of room for mods obviously and there is no better buy on the net for a finished ES9023 with a metal case. I love to mod so I would mod it, but stock it should have lower noise floor than UAE23, though I have no proof.

I might add that I have had best luck with the STOCK UAE23 running it at 78-80% Windows system slider control volume. They do not use the Vreg pin #6 on the DAC chip like the ODAC does [ODAC has 118K to ground there]. No right or wrong, but try taking your gain down from 100% to say 80 in the driver. If you can solder SMD then try 100K-130K ? 0603 ? SMD R on the vacant pins on the the PCB that go to ES9023 pin#6 to GND. I used 100K, love it!!

Un-modded and at 100% gain I would note some "hot" recordings would clip or lose linearity. DO a few things and you end up with a DAC that will blow away big-name old guard... certainly try 80% gain, and the UAE23+ version shipped to USA from USA is a great buy if you think what noise you are hearing is from USB. I am not aware of anyone in the DAC world selling a USB isolated DAC as low-priced as the UAE23+ that is made possible by the choice of the Tenor TE7022 USB receiver. All the newer faster USB setups run at 480Mbps and that is not cheap or as simple to isolate.

I have some Opticis m2-100-03 fiber optic USB isolators around excess PM me if interested, Google them first.

Last edited by enjoybiking; 30th April 2013 at 03:31 AM.
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Old 1st May 2013, 07:14 PM   #305
lohk is offline lohk  Europe
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I have two of the unisolated ones of this DAC (older and newer version) - both do not have any noisefloor, at least not noticable (not even under amplified conditions). I suspect that the reason if you can hear any noise must be located somewhere else, maybe at the source PC and its power supply via the mains ground.
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Old 1st May 2013, 07:33 PM   #306
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Well, good news - I got my lazy *** working and discovered that I don't have the same noise issues on my older PC. I have a bunch of old data, music, and movies that I want to gather up so I installed Ubuntu on a spare SSD...it had absolutely no problems recognizing the USB DAC. A tiny hiss from the speakers but not nearly the same problem I have with my main box.

Now to figure out why it exists in the first place and how to remedy it.
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Old 27th May 2013, 12:06 PM   #307
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Hi.

Has anybody tried the slightly updated (new batch with slight modifications) UAE23+ ?? Perhaps even with the 10$ TCXO option?



Quote:

New batch ready! Some minor differences:
- New box/shape matching a dedicated power supply we made (the power supply can also be used with previous version). Link
- We also added space on the PCB for a TCXO oscillator which can be added as an upgrade for 10usd.
- We removed the analog volume control, and added touch buttons to control the digital volume. These buttons will control the computer output level (same as if you use computer hotkeys to change volume)
more pictures coming soon.

It seems that they havn't really worked on tweaking the original design.


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Old 7th June 2013, 09:20 AM   #308
Roman M is offline Roman M  Russian Federation
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In UAE23+ I unsoldered resistor in MCLK line. On pins 13 and 14 ES9023 are soldered XO Golledge 50 MHz. Sound is much improved, better bass, better dynamics, better 3D image, better transparency. Recommended.
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Old 8th June 2013, 02:22 AM   #309
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Quote:
Originally Posted by enjoybiking View Post
...I might add that I have had best luck with the STOCK UAE23 running it at 78-80% Windows system slider control volume. They do not use the Vreg pin #6 on the DAC chip like the ODAC does [ODAC has 118K to ground there]. No right or wrong, but try taking your gain down from 100% to say 80 in the driver. ...

MMmm, ya right and wrong: the value and function of the resistor is specified in the datasheet ... D'oh!
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Old 11th June 2013, 11:01 AM   #310
nertia is offline nertia  Scotland
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A word of warning for people with the UAE23+ with analog volume controller. On my system, setting this to anything other than full absolutely destroys the sound.

This DAC is a very significant upgrade over my PCM2702 Bantam DAC, and I had been enjoying it for about a month, feeding my T2 amp. Last week I finally got around to installing my T2 in a decent case (after about 2 years of use), at the same time I upgraded the input capacitors. This process involved removing the onboard pot to make space for the large ampohm caps I wanted to use.

I thought that I could just use the DAC's pot until I decided on whether to build a separate preamp or not.

On testing the boxed amp, the sound was bass heavy, and seemingly missing large parts of each song I tested it on. Worried that the new input caps were to blame, I put my faith in the semi-mystical "Burn In" period that some specify for new caps and left the amp running over the weekend. This did nothing to improve the sound.

Re-testing the amp with the DAC's analogue volume at max and ALSA controlling the volume, much to my relief, everything is wonderful again. In short, never turn down the analog volume on this DAC.

Kind of wish I had known about the new version with the TCXO upgrade and digital volume control before I bought this version, but it has excellent sound nonetheless.
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