The "DAC-as-Preamp" Trap: Why DAC Buffers Bottleneck High-End Amplifiers

[solderdude]

Is this a
- Troll Feeding
or
-AI-Agent feeding
or
simply AI-tranlates-inadquate
?
Any claim for Turing-Test?

Looks like a (self proclaimed ?) electronics engineer not understanding the basics and overthinking things in an effort to crack the eternal question. Which is to look for an explanation for the discrepancy between what is perceived and what is measured. Assuming the 'issue' is not caused by perception but must have an electric origin.

 

[Salt]

Looks like a (self proclaimed ?) electronics engineer not understanding the basics and overthinking things in an effort to crack the eternal question. Which is to look for an explanation for the discrepancy between what is perceived and what is measured. Assuming the 'issue' is not caused by perception but must have an electric origin.

May be correct, and as I regard the Netherlands as neutral scientifically based area, @voodooless is questioned now.

 

[fpitas]

Is this a
- Troll Feeding
or
-AI-Agent feeding
or
simply AI-tranlates-inadquate
?
Any claim for Turing-Test?

Or maybe just education in electronics.

 

[DonH56]

As I said English is not my language - I am sorry if it offends you what I wrote.
Should we stop this and get back to the actual subject and reset discussion, which I find more interesting than chasing semantics. So you are 100% sure that a DAC buffer with volume control and a 200 Ohm / 20 mA is perfectly fine to drive any system and music signal?

20 mA into 10 k-ohms, a typical amplifier input impedance, will produce 200 V peaks. That is sufficient to drive any audio power amplifier I am familiar with; if you think not "any", then please provide an example of a case where the 20 mA/200-ohm output is not enough.

For slew, you need to know cable capacitance and the input capacitance of the power amp. There are examples here:

Interconnect Bandwidth

I decided to play around with interconnects just a little. Mathematically, that is! First, I checked a number of preamp, amp, and AVR specs (tube and solid state, from Pioneer to Krell and Audio Research) and found a range of around 20 kohms to 100 kohms input resistance, and none of them...

www.audiosciencereview.com

Again, please provide an example of a system where the capacitance is high enough to reduce the slew rate to below the audio bandwidth required. Typical interconnects run around 20 pF/ft, and input impedance can be 200+ pF, so say 500 pF for a 10 ft (3 m) cable t a power amp. Heck, double it, use 1 nF, and the slew rate is thus dv/dt = i/C = 0.020 / 1e-9 = 20 V/us. Using 4 Vrms, ASR's typical target for a preamp output, yields peak voltage of 5.7 Vpk. Using 6 Vpk the bandwidth is thus 20,000,000/(2*pi*6) = 530.5 kHz, which is higher than I can hear.

 

[fpitas]

-AI-Agent feeding

That was my suspicion, honestly, once the mish-mash of technical sounding stuff unfolded.

 

[RickS]

Looks like we are done here.