oldson
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Post by oldson on Apr 24, 2016 9:53:58 GMT
just downloaded the free dsf files that come bundled with mojo, in stereo 256. playing in jriver to mojo, still the same. stuttering the moment you open a browser, tab, email. not impressed. again its fine with micro, dop or native. now there is no upscaling going on. fine with micro on wasapi, that is. no good with aiso. is aiso generally more demanding than wasapi? |
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Rabbit
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Post by Rabbit on Apr 24, 2016 10:13:06 GMT
Just a thought Simon, in Windows 10, if you use Macafee it does quiet scans in the background which can be really annoying. You get no notification of this happening and when you switch off, it just resumes next time you switch on. A full scan takes ages on my machine. If I'm editing video, it can cause a lot of stuttering on the picture with hd files.
I just wonder if something like that is going on?
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oldson
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Post by oldson on Apr 24, 2016 10:27:11 GMT
will give it a go cheers.
i did have avg tune-up set for "live optimisation" .
had to adjust settings to make jriver "exempt", but it made no difference.
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Rabbit
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Post by Rabbit on Apr 24, 2016 10:34:04 GMT
It's the scanning process that seems to 'muddy' my computer up a bit. I first noticed with video edits which I do quite a lot of. It didn't affect the final edit, but previewing could be a joke if a scan was running in the background. It also seemed to stop and start randomly.
Now, I just stop scans and do it manually overnight. A full scan takes forever as well.
Hi res music files also take a lot of processing power.
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oldson
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Post by oldson on Apr 24, 2016 10:53:41 GMT
found no background scans running.
back on the micro for now.
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oldson
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Post by oldson on Apr 24, 2016 11:06:16 GMT
Converting anything from a lower bit rate to a higher one wouldn't change anything except make the file bigger with (in effect) low resolution sound. No data is added to the original unless the pc is 'guessing' what to add. A bit like getting a low resolution photo and then copying it by taking a picture with a high resolution camera. There will be no difference. That's why I'm wondering exactly what upscaling actually is. maybe Javier could give an opinion on this? |
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Rabbit
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Post by Rabbit on Apr 24, 2016 11:16:19 GMT
Upsampling seems to suggest that it just converts up but maybe something else is going on, but I can't see how the source is actually improved.
As an example, I could use an mp3 at 128k and convert to wav and there would be no difference. Maybe with raw data files being put out, then the final bit rate is way more important but I'm not so sure if the original is at a fixed bit rate.
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oldson
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Post by oldson on Apr 24, 2016 11:21:49 GMT
on a side note i have ,at last found some dsd files i would like...... www.hdtracks.co.uk/crying-298172?format=AIFFi suppose if i download the dsd as opposed to 24/176, mojo wont play it because its native? i dont fully understand. technically which is best 24/176 or dsd64? |
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oldson
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Post by oldson on Apr 24, 2016 11:30:12 GMT
just seen a used mojo go for £326 on ebay.
maybe i will cut my losses and try it on a "buy it now".
will see if i hear back from chord first, of course.
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Rabbit
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Post by Rabbit on Apr 24, 2016 12:49:14 GMT
on a side note i have ,at last found some dsd files i would like...... www.hdtracks.co.uk/crying-298172?format=AIFFi suppose if i download the dsd as opposed to 24/176, mojo wont play it because its native? i dont fully understand. technically which is best 24/176 or dsd64? You know what Simon, my guess is that you would have a seriously hard time telling the difference! |
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jello
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Post by jello on Apr 24, 2016 14:04:06 GMT
just seen a used mojo go for £326 on ebay. maybe i will cut my losses and try it on a "buy it now". will see if i hear back from chord first, of course. You could try listing it on AV Forums Simon as you'd likely clear more than on ebay. Last one was listed at £315 iirc and Mojos tend to sell quite quickly, so think you'd easily clear £300+ after postage. No selling fees to worry about and most trades are paid for using Paypal Gift or bank transfer so no PP fees either. Sometimes folk can be a bit wary about buying from new members selling high value items but I'd be happy to vouch for you (been a member for over 10 yrs) if you don't already have an account. |
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jello
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Post by jello on Apr 24, 2016 16:08:34 GMT
on a side note i have ,at last found some dsd files i would like...... www.hdtracks.co.uk/crying-298172?format=AIFFi suppose if i download the dsd as opposed to 24/176, mojo wont play it because its native?i dont fully understand. technically which is best 24/176 or dsd64? I don't think that's the case. If Javier's theory is correct then Mojo will play native DSD material just fine (which I think the free Chord album is) but in order to do so JRiver has to plonk the DSD files into a PCM wrapper first, otherwise the Mojo's USB IC won't accept them. Once they sneak past the USB IC though the wrapper gets ditched leaving 'unadulterated' DSD files which the Mojo's DAC section will gratefully receive. I suppose the wrapper acts a bit like a digital trojan horse. But unless you can get to the bottom of the stuttering issue the 24/176 version would probably be safer. As I don't have the Mojo I can only go by what is found at their site (http://chordelectronics.co.uk/mojo/). It only mentions DoP and your results confirm native DSD is not supported so in this aspect is less flexible than the micro. No biggie other than the additional bandwidth required (DoP needs 2x the bandwidth of native DSD) but the content is the same once the PCM wrapper is discarded. The reason for this is they are most likely using a USB IC that doesn't support DSD (like CMedia's) and they need to trick it into believing it is receiving PCM. Once the signal reaches the DSP the wrapper is removed and the DSD signal sent to the DAC part. |
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oldson
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Post by oldson on Apr 24, 2016 17:11:47 GMT
well i finally got the free so called dsd files to play without a hitch. ie no stuttering when doing other things on pc.
but jriver does not output them as dsd, with no processing selected! instead they are downscaled to 176khz as shown by the turquoise led on mojo.
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oldson
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Post by oldson on Apr 24, 2016 18:22:19 GMT
wish i had not ordered an ipurifier2 for the mojo now.
hopefully i can return it un-opened for a refund.
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Rabbit
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Post by Rabbit on Apr 24, 2016 18:24:57 GMT
Crikey Simon. Since the idsd went down, you've had an awful lot of bother with digital stuff!!
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