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by jd20 2726 days ago
There's a sharp curve of diminishing returns, for DAC's especially. The super cheap units you find for like $10-20 will usually have serious shielding / noise issues, which is immediately apparent upon listening. Beyond $100-200, the design and components are usually pretty competent, and what you are mainly hearing is just how the implementation was "tuned" by the manufacturer (not necessarily better or worse).

Playing from an iPhone or iPad is perfectly fine. Make sure EQ and Sound Check are turned off. Most music streaming formats are nearly impossible to differentiate from lossless (i.e. Apple Music, Tidal, Spotify), so I wouldn't sweat that.
1 comments
zzzcpan 2726 days ago
> The super cheap units you find for like $10-20 will usually have serious shielding / noise issues

That's not true if even possible (because dac and amplifier are on a single cheap). I've tested like five different DACs, from $2 to $150, even those for $2 that play distorted sound and don't bother putting output capacitors for headphones have no noise/shielding problems.

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jd20 2726 days ago
Not sure why it's not possible, though I could've had a defective unit. Specifically, I had a Fiio D3 ($20) which had bad background noise, even when not playing. I always assumed it was a power supply or shielding issue. The audio output from it actually sounded decent, just I could always hear the background noise. Don't think it was a grounding issue either, because it was the only DAC I ever had that consistently did that, no matter what system I plugged it into.

I've played around with the DAC built-in to the Raspberry Pi 3 as well, and that one was more of a distorted output problem, similar to what you describe with the $2 DAC.

Other DAC's I've tried (from around $75 and up) I've never heard noise / shielding issues, so again rapidly diminishing returns once you get past the super budget options, in my experience.

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zzzcpan 2726 days ago
If you hear high frequency noise it's just means the amplifier has too much gain for your headphones and doesn't automatically mute when there is no signal (many do). But all amplifiers have noise. If you use the line output though, it doesn't go through the amplifier and of course doesn't have its noise.
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