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Old 27th July 2009, 09:07 PM   #1
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Default USB to analog

Hi

I am planning to make new preamp. To that I need USB to analog converter.

At the moment I work with 2 options:

Use a PCM2702

Use a PCM2902 and use the spdif out to the ezDAC.

Does anyone in this forum have an idea of which option will have the best sound performance?

Ideas to other options, usb->analog are welcome

Best regards,
Martin.
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Old 27th July 2009, 09:52 PM   #2
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Default Re: USB to analog

Quote:
Originally posted by GnuNielsen

Use a PCM2902 and use the spdif out to the ezDAC.


Use a chip which will give you the option for I2S out, like a PCM2907 and connect it directly to the ASRC of the ezDAC. If you want to keep the spdif input use relays to switch between the two. IME the sound is much better than using spdif and the asrc seems to cure a lot of the usb jitter.
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Old 28th July 2009, 08:14 PM   #3
sivrat is offline sivrat  South Africa
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Have you looked at the alien DAC or the bantam?
These provide USB and seem to have good reviews.

I think they use the PCM 2702.
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Old 28th July 2009, 09:27 PM   #4
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Default Re: Re: USB to analog

Quote:
Originally posted by analog_sa



Use a chip which will give you the option for I2S out, like a PCM2907 and connect it directly to the ASRC of the ezDAC. If you want to keep the spdif input use relays to switch between the two. IME the sound is much better than using spdif and the asrc seems to cure a lot of the usb jitter.
do you mean relays or a logic switch. Is relays fast enough to a I2S bus?
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Old 28th July 2009, 09:44 PM   #5
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Relays are absolutely fine. Fastness is not an issue as they have low parasitic capacitance. In one of my prototypes i used the exact combination of parts as described above with 2 relays to switch between an spdif receiver and a PCM2707. I remember listening carefully for deterioration from the switching but couldn't hear any.
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