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Old 31st March 2012, 09:23 AM   #1
BcA187 is offline BcA187  United States
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Default Modifying my DAC

Hi, I bought an iBasso D4 roughly a year ago and am now wondering if I could modify it to support higher sample rates from the USB. I've done a bit of googling and noticed that it's DAC (Wolfson's WM8740) is capable of 24/192kHz. I also found out the D4 is using a TI PCM2706, which apparently limits the the input from USB to 16/48. Is it possible to have the PCM2706 removed and have a TI TAS1020B installed in it's place, and expect the DAC to support 24/96 from the USB? I'm a bit new to this and have never soldered before too. Please excuse my ignorance if this idea sounds retarded. If on the other hand this can work, I may be able to get somebody with soldering experience to do this. (This is implying it's possible and I can buy the TI TAS1020B). Thanks.
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Old 31st March 2012, 12:14 PM   #2
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by BcA187 View Post
Is it possible to have the PCM2706 removed and have a TI TAS1020B installed in it's place...
I doubt it since they look like totally different chips.

Out of curiosity; how come it has a PCM2706 and a Wolfson DAC? The PCM2706 already has a built-in DAC and headphone outputs.
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Old 31st March 2012, 06:35 PM   #3
BcA187 is offline BcA187  United States
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Originally Posted by godfrey View Post
I doubt it since they look like totally different chips.

Out of curiosity; how come it has a PCM2706 and a Wolfson DAC? The PCM2706 already has a built-in DAC and headphone outputs.
I'm honestly not sure why iBasso did it. I'd imagine they wanted to use the Wolfson chips but limit the sample rates from USB.
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Old 31st March 2012, 07:45 PM   #4
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Because the TI chip does not require drivers under Windows or Mac - USB1.1 universal audio specs. The TAS1020B is identical in that aspect (USB1.1 specs, 16/48 limited).
The only way to get past that is to use a USB2.0 device, but that require specific drivers.
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Old 31st March 2012, 09:46 PM   #5
BcA187 is offline BcA187  United States
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Quote:
Originally Posted by SoNic_real_one View Post
Because the TI chip does not require drivers under Windows or Mac - USB1.1 universal audio specs. The TAS1020B is identical in that aspect (USB1.1 specs, 16/48 limited).
The only way to get past that is to use a USB2.0 device, but that require specific drivers.
That's odd I hadn't noticed this. I'll search around for a chip that supports the higher rates.
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Old 31st March 2012, 10:28 PM   #6
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Is not the cip but the USB 1.1 and universal drivers in Win/Mac.
The cheap USB2.0 ones that support higher rates are Tenor TE8802 (or older TE0722 that doesn't support 88.2kHz) or CM6610. You need to research the drivers compatibility for your OS.

Last edited by SoNic_real_one; 31st March 2012 at 10:34 PM.
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