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Class D Switching Power Amplifiers and Power D/A conversion

Setting up a Fusion Amp 3-way Step-by-Step
Setting up a Fusion Amp 3-way Step-by-Step
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Old 10th February 2019, 06:50 PM   #21
ds23man is offline ds23man  Netherlands
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It was a Focusrite 2i2 gen 2.
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Old 10th February 2019, 06:59 PM   #22
00940 is offline 00940  Belgium
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Afaik, all Scarlett devices, 1st and 2nd generations, share the same cs4272. That's why I'm interested by the problems you had.
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Old 10th February 2019, 08:02 PM   #23
cowanaudio is offline cowanaudio  Australia
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Setting up a Fusion Amp 3-way Step-by-Step
I'm interested in the nature of the timing problems too, because I have a 2i2 gen 2 that I intended to use for measurements with HFD.
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Old 10th February 2019, 08:15 PM   #24
mspijker is offline mspijker  Canada
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How does the ADC/DAC (re)sampling in the FusionAmps fit in all of this? The FusionAmp's ADC & DAC run on a different clock than the microphone's ADC. Doesn't that introduce the same sampling uncertainty? Ideally you'd drive the Fusionamp with a digital input, digitize the mic with the FA's ADC and read it back through the USB to HFD. But I guess that that's not possible.
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Old 11th February 2019, 06:09 AM   #25
ds23man is offline ds23man  Netherlands
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Quote:
Originally Posted by 00940 View Post
Afaik, all Scarlett devices, 1st and 2nd generations, share the same cs4272. That's why I'm interested by the problems you had.
They use the CS4277 as ADC and the AKM4384 as a Dac.

bo: Focusrite Scarlett 2i4 inside.
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Old 11th February 2019, 06:29 AM   #26
00940 is offline 00940  Belgium
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The 2i4 needs the 2 extra output channels, hence the AKM. The 2i2 doesn't and only have the CS4272.

But that's not very important. What's more interesting is the problems you had and what we should be watching for.
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Old 11th February 2019, 06:39 AM   #27
ds23man is offline ds23man  Netherlands
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Quote:
Originally Posted by cowanaudio View Post
I'm interested in the nature of the timing problems too, because I have a 2i2 gen 2 that I intended to use for measurements with HFD.
Two loopback measurements with the Scarlett:

https://www.diyaudio.com/forums/atta...1&d=1549870611

When you do let's say 10 measurements 1 is correct. With the Focusrite ASIO driver it's more worse.
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Old 11th February 2019, 07:46 AM   #28
Windforce85 is offline Windforce85  Poland
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Quote:
Originally Posted by ds23man View Post
Two loopback measurements with the Scarlett:

https://www.diyaudio.com/forums/atta...etverschil-png

When you do let's say 10 measurements 1 is correct. With the Focusrite ASIO driver it's more worse.

So basically, along your assumptions, Clarett 4Pre USB interface is also a crap? This is eye-opening.
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Old 11th February 2019, 08:19 AM   #29
ds23man is offline ds23man  Netherlands
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For this application: YES. Does not mather what software you use.
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Old 11th February 2019, 08:37 AM   #30
ds23man is offline ds23man  Netherlands
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I discovered this when I made new measurements of my 3 way system with the Scarlett.

When I made new filtersettings I got unrealistic delay settings, like the mid was shifted fisically 30 cm forward and the tweeter to the rear.

I think the XMOS chip is the culprit, so validation of the measurement setup will be a important part in the manual.
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