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Old 23rd September 2011, 12:39 PM   #771
Marek is offline Marek  Poland
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Clock cycle @192kHz (and DATA bit length) is ~81ns so even if you use double 74HC164 (2x8bit) delay it will be ok. I used this solution and it works very good.
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Old 23rd September 2011, 05:46 PM   #772
Javin5 is offline Javin5  Switzerland
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Is there any degradation to be expected with the exaU2I if other USB-ports are busy as well?

Specifically, I would like to connect a USB-HD, which contains all my music files to one USB-port and the exaU2I to another USB-port. A mouse and keyboard will be connected to futher USB-ports.

Im a bit worried about the USB-HD, since the PC will now have to do all the file reading (wav-files) via USB and serve the exaU2I at the same time. I plan to use a low power, passively cooled PC for this, so there is limited computer power available. Im thinking about an AMD Fusion E350, for which Asus has a very nice passively cooled mini itx mainboard.

Any experience from exaU2I users who play their music from an attached USB-HD rather than from an internal SATA-HD?
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Old 24th September 2011, 07:11 AM   #773
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Quote:
Originally Posted by Javin5 View Post
Im thinking about an AMD Fusion E350, for which Asus has a very nice passively cooled mini itx mainboard.

Any experience from exaU2I users who play their music from an attached USB-HD rather than from an internal SATA-HD?
Why not buy an external SATA-HD enclosure ?
With most kits you get an internal SATA to external SATA cable.

I would also recommend a Zotac ITX motherboard with a Intel i3 2105 or a i5 2405S CPU and a SSD system HD.
You also get a working eSATA connector on the motherboard
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Old 24th September 2011, 12:22 PM   #774
Javin5 is offline Javin5  Switzerland
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Originally Posted by RayCtech View Post
Why not buy an external SATA-HD enclosure ?
With most kits you get an internal SATA to external SATA cable.

I would also recommend a Zotac ITX motherboard with a Intel i3 2105 or a i5 2405S CPU and a SSD system HD.
You also get a working eSATA connector on the motherboard
The Asus ITX board also has an eSATA connector. However, the passively cooled Zotac is certainly an alternative I'm going to check out. Thanks for mentioning it.

I was more thinking about a USB-HD than an eSATA-HD because of the wide available choice, also of very quiet models.
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Old 25th September 2011, 08:12 AM   #775
Coris is offline Coris  Norway
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Originally Posted by Javin5 View Post
The Asus ITX board also has an eSATA connector. However, the passively cooled Zotac is certainly an alternative I'm going to check out. Thanks for mentioning it.

I was more thinking about a USB-HD than an eSATA-HD because of the wide available choice, also of very quiet models.
Best solution in this case is to have music files on an SATA HD (eSATA). Best of all is to use an SSD on eSATA. Then you can use from USB port only +5v to power the eSATA (SSD) HD. An CLC filter on that 5v power line from USB port is also recommended...
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Old 25th September 2011, 09:35 AM   #776
regal is offline regal  United States
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Originally Posted by Marek View Post
Clock cycle @192kHz (and DATA bit length) is ~81ns so even if you use double 74HC164 (2x8bit) delay it will be ok. I used this solution and it works very good.
There are a lot of folks "into" the AD1862, AD1865, PCM56, PCM58, even PCM1702/1704. Good dac's really. But the I2S connection sans digital filter is always problematic. Wouldn't it be nice if the exa firmare or maybe even the driver software could be configurable for the DAC of choice. I mean this thing has 8 channels right? Why not for stereo split the I2S into L&R combatible format for these different DAC's. Just click the mouse to pick AD1865. It would be a huge advancement for all the NOS builders. Even if you aren't into NOS you could use the computer to upsample, which would allow a better analog filter. The potentital is there really, and with Hirez becoming more popular a 24/192 PCM1704 NOS DAC starts to make a lot of sense to even those not into NOS. Heck there are even reports of some new commercial NOS PCM1704 beating the PM2.

Just saying there is a potentital to really expand this. In a few years you can bet a lot of folks will be oversampling with their computer (custom PC digital filtering), this would be a step in that direction.

Last edited by regal; 25th September 2011 at 09:37 AM.
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Old 25th September 2011, 10:12 AM   #777
Javin5 is offline Javin5  Switzerland
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Originally Posted by Coris View Post
Best solution in this case is to have music files on an SATA HD (eSATA). Best of all is to use an SSD on eSATA. Then you can use from USB port only +5v to power the eSATA (SSD) HD. An CLC filter on that 5v power line from USB port is also recommended...
What would be the advantage of using a second cable to supply power from usb to an external eSATA-HD? The eSATA cable already supplies the required power. If supply filtering improves SQ, this could be done in the eSATA cable or (much better) in the external eSATA case.

Yes, an SSD for the music files would be nice. But Im needing about 2 GB, which costs peanuts as a HD, but is still unrealistic as an SSD.

Back to the original question: Is there any experience of using the exaU2I when the music files are on an external USB-HD instead of an internal SATA-HD? Sound quality? Degradation with HD-files?
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Old 25th September 2011, 11:32 AM   #778
Coris is offline Coris  Norway
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Originally Posted by Javin5 View Post
What would be the advantage of using a second cable to supply power from usb to an external eSATA-HD? The eSATA cable already supplies the required power. If supply filtering improves SQ, this could be done in the eSATA cable or (much better) in the external eSATA case.

Yes, an SSD for the music files would be nice. But Im needing about 2 GB, which costs peanuts as a HD, but is still unrealistic as an SSD.

Back to the original question: Is there any experience of using the exaU2I when the music files are on an external USB-HD instead of an internal SATA-HD? Sound quality? Degradation with HD-files?
I have to recognize that my earlier post was quite confusing. I had to be more specific...
I personally use an ordinary SSD as external HD, and I have a SATA cable which is normal on one end and eSATA connector in anther end. I use an eSATA port to connect this standard SSD to. So, is not any power for the HD in this set up. That because I have to use an USB port to power my SSD HD.
Referring to your question, there is no any advantage to use another power supply if one use exclusively eSATA interface on eSATA device. But I would want to have that filter anyway on power rail.
On the player I have there is an difference between using USB as HD interface and using an existing eSATA port for HD with the music files. In my case it sound better with HD on the SATA. Else, if is about a PC-media machine with exaU2I on USB I think is better to have the files on internal SATA. If one use an external/mobile HD to a dedicated media PC or player, then is an advantage to have one external HD, which can be connected where is need it for playing/update the files.
The only problem I can see is when data transfer ocure on USB interface (using USB HD), and in the same time, the same type interface in a PC is used for drive exaU2I. I would prefer to have a different interface involved in reading files/data than I will use for output with exaU2I.

Last edited by Coris; 25th September 2011 at 11:35 AM.
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Old 25th September 2011, 12:05 PM   #779
Coris is offline Coris  Norway
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eSATA port is not provide power for external device
eSATAp provide power through port...
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Old 25th September 2011, 03:19 PM   #780
Javin5 is offline Javin5  Switzerland
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Originally Posted by Coris View Post
eSATA port is not provide power for external device
Sorry, you are of course right. The eSATA cable has balance transmission for send and receive, but power to the external drive is provided from a small power supply from the mains. You could possibly put additional filtering there or replace it with a linear supply to test if this affects SQ.

There are some external HDs with both USB and eSATA connectors, a little more expensive, but still reasonable. So this will most likely be my way to go. My internal drive will be a silent SSD, which need not be very big since the music files are on the external drive.
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