mirekti
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- Apr 28, 2016
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I went ahead and ordered it.
Has it arrived yet? Any time spent using it with HQPlayer?
I went ahead and ordered it.
It has indeed. Still in box though . First I will do a quick review/measurement of it and then get onto HQPlayer.Has it arrived yet? Any time spent using it with HQPlayer?
Curious about the recent debate about HQPlayer upsampling I found your post. I was glad you did not delete it.OOOPS!!!! Experimental mishap. Leaving this here for now, but may delete it.
I started out with a Dell laptop feeding the firewire lead to the TC Impact Twin. I was using a Lenovo with the Forte. After the first test I swapped places with the computers. I was checking other software for playback and upsampling. I swapped as that software was already on the Lenovo. There are some differences, but very, very minor. I ran the initial 48 khz natively in Foobar and it was also clean with low noise the second time on the Lenovo. Somehow the Dell firewire port is causing high jitter and a higher noise floor in the TC Impact Twin. With the Lenovo it is clean. Let people not complain about asynch USB.
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Okay had some time to kill so did a few measures with Foobar and HQplayer.
The ADC was the Focusrite Forte set to 192 khz/24bit. The DAC was the TC Impact Twin first playing a 48 khz test file with Foobar via ASIO. Next I played the same 48 khz test file via HQ Player using the TC set to 192/24 as HQ Player upsamples to that rate. I used the poly-sinc filter. In all of these FFTs the blue curve is the Foobar playback and green is HQ Player.
First up silence to see the noise floor. You'll see the HQ player is about 12 db lower in noise below 20 khz. The 31 khz spike is an idle tone in the Forte ADC, and the noise rise above 50 khz is the Forte.
View attachment 7681
Now a 1 khz tone. The noise floor is nastier around the Foobar tone while the HQ Player noise floor is not much effected. With HQP the harmonics rise cleanly out of an even noise floor. There also are some low level spikes at 43&45 khz and double that which are absent in HQP.
View attachment 7682
Now for some twin tone IMD signals at 18&19 khz. The Foobar playback has much more grass around the tones and more ultrasonic mirror tones as well. View attachment 7683
Now a look at the Jtest signal at 12 khz. Would appear the HQ Player results in lower jitter around the Jtest signal. Presumably that is also why the general noise floor is lower. View attachment 7684
Now some - 4db white noise from each device. The filter in the Foobar version rolls off starting at 20 khz and is pretty steeply filtered. The HQP version is much cleaner ultrasonically though not rolling off until near 22 khz.
View attachment 7685
So if one is comparing bit perfect playback at the native 48 khz rate and the upsampled playback via HQP it is clear HQP gives better results. Whether any of these artefacts are audible is another issue. HQP is measurably superior.
That would be great if you could! Thanks for all your hard work @amirmI have been meaning to do this for years now but never finding the time.