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Topping D30Pro Review (Balanced DAC)

jannek

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So I guess this is where the discussion starts if some aliasing above 20 kHz or a frequency response 35 dB down at 20 kHz is to be preferred...
 

AnalogSteph

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Now that's steep! Is this using what Cirrus Logic already provides or did you have to create this from scratch?
None of the stock CS43198 single speed filters are down by more than ~6 dB at fs/2, so I imagine those may be 3 and 4 (FIR and IIR versions, respectively).
 

Rottmannash

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None of the stock CS43198 single speed filters are down by more than ~6 dB at fs/2, so I imagine those may be 3 and 4 (FIR and IIR versions, respectively).
Is it possible to "create" new filters not already programmed into the chip?
 

bennetng

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So I guess this is where the discussion starts if some aliasing above 20 kHz or a frequency response 35 dB down at 20 kHz is to be preferred...
That's called imaging instead of aliasing and it happens above 22.05kHz rather than 20kHz. BTW I wonder why the stopband is 21kHz rather than 22kHz, perhaps a limitation of the programmable filter settings? Anyway, the most popular ~0.55fs stopband filter is still there, as well as the NOS one so that others can use it with their own software upsampler, should be no more compliant I suppose.
 

JohnYang1997

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That's called imaging instead of aliasing and it happens above 22.05kHz rather than 20kHz. BTW I wonder why the stopband is 21kHz rather than 22kHz, perhaps a limitation of the programmable filter settings? Anyway, the most popular ~0.55fs stopband filter is still there, as well as the NOS one so that others can use it with their own software upsampler, should be no more compliant I suppose.
oops.
 

MGG

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There are a number of situations where a volume control on a DAC is useful. E.g., the toslink output on all smart TV's I know is fixed volume. So if you're going Smart TV->DAC->active speakers, that's how you control volume.

Just go with Smart TV (headphone-out)->active speakers, it's usually good enough and allows you to use TV's remote for volume controle. I don't get why people are obsessed with DACs, pretty much any DAC is good enough.
 

sandymc

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Just go with Smart TV (headphone-out)->active speakers, it's usually good enough and allows you to use TV's remote for volume controle. I don't get why people are obsessed with DACs, pretty much any DAC is good enough.

I don't really do "good enough". :):cool:
 
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I realized that this is using the quad array of the cirrus CS43198. The new iBasso flagship DAP, the DX300, implements that very solution as well. Quite interesting since it's a bit of an odd duck DAC chip. From what I have garnered thus far, however, that particular DAP is excellent.
 

AudioSceptic

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That's called imaging instead of aliasing and it happens above 22.05kHz rather than 20kHz. BTW I wonder why the stopband is 21kHz rather than 22kHz, perhaps a limitation of the programmable filter settings? Anyway, the most popular ~0.55fs stopband filter is still there, as well as the NOS one so that others can use it with their own software upsampler, should be no more compliant I suppose.
I did wonder about that. Seems odd not to get closer to 22k if you can, and move the "corner" closer to 20k.
 

Adahn

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@JohnYang1997

How's the inputs working? Selectable, mixed, overriding?

If you feed it through all 3 inputs (usb, optical, coaxial) what comes out?
 
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