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Old 27th November 2011, 08:56 AM   #1
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Default Hi-resolution source 192KHz 24bit (USB to Analog)

After many time to ear the my Hi-resolution easy system created using a EMU 0404 USB modified in the output stage and power supply probably now I have found something better.

Here the EMU 0404 USB + Lundahl 1527XL or LL7903 + Power supply + Sanyo OS-CON bypass yesterday inserted also in the output stage to replace the MKP + silver mica
Hi-Resolution System 192KHz 24bit with EMU 0404 USB

The new project use the Acko DAC module for the USB to I2S convertion.

Here the USB I2S Module-AKU-24 + Wolfson WM8740 + LT1086 linear regulator with many OS-CON + Lundahl LL1527XL
http://www.audiodesignguide.com/HiRe...on_Lundahl.JPG

Yesterday evening in a listening test with some my friend the new source has been considered better than previous.

I would like to create a new test in the future to check the USB I2S Module-AKU-24 with AK4396 AKM used in the EMU because the Wolfson can hide some defects of the digital recording making it more pleasant.

In any case the Wolfson WM8740 is a very good DAC using the ,amy commercial product like the TACT
Tact 2.2x upgrade

It is possible use a single 12V battery in the power supply for this new source.

The test environment:

- My new Amplifier End Amplifier End by Andrea Ciuffoli

- My Monitor 3
the Monitor 3

- Foobar2000 v1.1.6

- DRC software
Digital Room Correction
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Old 27th November 2011, 09:01 AM   #2
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Acko DAC USB-I2S module available from

https://sites.google.com/site/ackodac/home

Soon other details about this project
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Old 27th November 2011, 01:54 PM   #3
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EMU0404 - why would you use transformers on the AK4396 (voltage output) is past my understanding powers...

Actually why use transformers ANYWHERE? I guess everyone is entitled to one obsession
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Old 27th November 2011, 03:41 PM   #4
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SoNIc,
any DAC chip need a good output filter to reduce the signal at the sampling frequency and it is necessary a differential stage to get an unbalanced signal.
A good output transformer like the LL1527 can resolve both problems.

The original article about this use can be read on:
http://www.audiodesignguide.com/doc/pag1.jpg
http://www.audiodesignguide.com/doc/pag2.jpg
http://www.audiodesignguide.com/doc/pag3.jpg
.......

As you can see in the webpage about EMU 0404 USB mod. I have tested other output stages but I prefer this.
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Old 27th November 2011, 08:46 PM   #5
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A transformer has limited bandwidth (either low, high or both), filtering curve nowhere close of what is needed for a DAC (even after carefull tayloring, it's still just a second order), distortions (at zero crossing and intermodulations at max signal) higher than what an OpAmp can provide...
EMU 0404 is a good card, linear PS sure can help, but I really doubt that you did get better or even equal performance with what the original OpAmps had (not saying what would better OpAmps would give).

Sure, this is my 2cents.

Last edited by SoNic_real_one; 27th November 2011 at 08:50 PM.
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Old 28th November 2011, 10:15 AM   #6
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Have someone saw a ES9018 or ES9012 on DIP socket ?
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Old 28th November 2011, 10:31 AM   #7
qusp is offline qusp  Australia
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you do realise they both have a need for 7 different power supplies, which all need high quality decoupling and run at a speed that will look ugly as hell after a dip socket right?
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Old 28th November 2011, 10:53 AM   #8
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dip socket does not alter the signal path but very important is a short I2S connections to the USB-i2S converter
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Old 29th November 2011, 08:16 AM   #9
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In the future I will test other Lundahl output transformers
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Old 30th November 2011, 05:12 AM   #10
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USB I2S Module-AKU-24 price 168$ + 13$ WM8740 on DIP socket + Lundahl 160-200$
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