Cause of different sound between dacs

Here is an overview of some of the things responsible for the overall sound a DAC design. There are actually more things involved than I will list mind you, even though this list may seem longish.

- Input receiver choice (the circuit the connects the incoming digital signal jacks and transfers the digital data to the DAC chipset itself)

- Power supply design for the DAC, input receiver power supply quality and output gain sections.

- Any filtering that may be incorporated on the incoming AC and/or digital data input and/or DAC chipset output (which can be within the DAC chipset itself) and/or the output stage itself. Read; FOUR DIFFERENT CIRCUIT AREAS within the DAC which could have filtering implemented of various design and quality choices on those differing circuits.

- Regulation choice for the above circuit sections.

- Jitter reduction methodology, if any.

- DAC chipset choice and implementation.

- Board layout, EMI, RF and noise considerations of the various circuits involved.

- Output section choice (op amps or discrete?)

- Bias of the output devices, if they need biasing.

- Power supply caps, quality, amount, power supply circuit implementation.

- Current to Volt conversion circuit topology for DAC chipsets that require it prior to the gain stage.

- Various supporting components, resistors, clocking, supporting component quality for input, power supply(s), DAC chipset, regulation(s), output devices and quality of caps used on capacitor coupled output stages- read; discrete output which is a better step-up sonically above utilizing Op Amp outputs.

As you can now see from this list, the variables within a given DAC design are many. Hence, the differences between two different DACs are so much more than just "the DAC chipset" choice or "the jitter reduction"; which are typically the only core technical things discussed as "the crucial components" of the DAC design. If creating a heroic sounding DAC was only as simple as the DAC chipset and the jitter reduction ;-)

Cheers,

Eric Hider - dB Audio Labs

Look inside. No two are exactly the same. They are all different. Only question is how similar or different any two are.

If you ever try two brands of vanilla ice cream, that taste EXACTLY the same, they probably are, ie same stuff under a different label. That happens on occasion with audio gear (exact same product marketed under two different brands) but not often.

For a brief illustration of some of the complexities that are involved in optimizing just a couple of the many factors that have been cited by the others above, take a look at this paper (although it focuses on A/D rather than D/A conversion).

Entire textbooks have been written about many of the individual factors the others have mentioned.

Very few designers can be expected to possess world class expertise in all of these areas. And designs that are intended to meet a given set of requirements will inevitably be implemented differently by different designers, regardless of how similar their expertise may be.

Regards,
-- Al

I admit to being "gobsmacked" as John Malkovich put it.
And I thought bits are bits, chipsets are so improved they must be nearly identical, power supply function so well established that there must be a basic template that is efficient & effective. This is just another reason why stadardization would be so helpful and "economical".
I thought the 2 dacs I quoted must be soo similar as they are at the top of the heap.
Mindnumbing.
OK. Is the newer K03 better than the original or new Alpha Dac and if technically possible please reveal some of the reasons. I assumed the k03 being newer,from a huge digital company, MUST be better. Am I mistaken?

I wouldn't look inside because its all "GREEK" to me.
I was hoping for a simpler answer and a simple way f
of making sensible choices. I'm feeling like stepped into a land mine-and wouldn't know one if I saw it. Scary.