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-edited- The reason might be that it won't enter update mode without the update tool properly prepared on your PC. Your YT clip looks like you're trying to enter update mode manually just by pressing-holding FN for 5 sec while powering it on. That's good....but that's not enough! You need that...

If you follow the instructions from post #216 it should work (just choose firmware V1.0 file instead for upload onto device) https://audiosciencereview.com/forum/index.php?threads/smsl-d300-review-balanced-dac.28919/post-1354049

AFAIK reading out firmware version via USB in terminal mode requires advanced skills and therefore (seems like) for aficionados only. I might be wrong. It's not indicated on D300's display.

I made these two demo clips at #241 and #242 of this thread. I was able to solve the pop issues by installing firmware rev. 1.0 from #259 - at the expense of split seconds of muting here and there (PCM data, preamp mode, e/g changing sample rate or pausing and playing once again). You may expect...

Seems like at least for some weeks(?) that firmware was installed ex factory before maybe withdrawn again. My S/N 1108213221134, received early November from P.R.C. located stock, sent out mid October.

Mine (I own three pieces of it) are the "older" A20a(s) from 2020. I "just" had to replace all three PSU boards which initially came faulty by design. Apart from that these work flawlessly. Due to ultra low power consumption you can leave them powered on without "making plans" about listening...

As @subcode stated, while maintaining sample rate there will be just clicks with playback starting, resuming, stopping via USB. Severe "blasts" will occur any time you change sample rate or start-stop-resume playback in exclusive mode. That means in situations when sample rate is controlled by...

New ways of import VAT prepayment have been established by postal organizations worldwide within the last few years. So there is still IOSS (designed by EU) for goods below 150€ but also competing soltutions implemented by postal organizations with each other on a bilateral basis.

They do have to learn. Most importantly, not to later cripple their devices with broken firmware. The worst thing is when broken firmware is implemented as factory default with later batches of production - and there's just no way to roll it back by unlucky later buyers affected. Like they...

Here's one more. SMSL D300 at preamp mode with volume set to "4" (4 from 100!), connected to "pure analogue" power amplifier ATOLL AM300 with no speaker protection feature. And somewhat larger speakers connected. Crank up the volume to barely hear the music. And hear these severe blasts when...

My 2020 Sabaj A20a(s) for my taste slightly, just slightly, outperform the D300(s) when it comes to sound quality. If you compare these Infineon based builds with classical Class AB amps it's mostly something like slightly more grip in that bass region, just more oooomph - still - from the Class...

Roksan (we're talking about power amps, aren't we?) K3 has a nasty auto-power-off feature built in which won't allow you to keep it powered on at low volume listening level sessions. It powers off way too early that means it's just not sensitive enough to detect low level signal input. That's...

According to manual (https://www.topping.audio/newsinfo/769032.html) 7 PCM filters and no tone control, as usual (E1DA would offer that, maybe better wait for that upcoming Cosmos DAC?). Output channel seems like either-or. Manual refers to "switching" only. From my point of view - we waited so...

These well measuring DACs should "sound" the same. Don't forget about output and input impedance. Parts of the frequency spectrum might be slightly obscured if input impedance is too low for the source. To give you an example, some of these less powerful dongle DACs (while measuring e/g glorious...

That would mean revealing business secrets. Leading you "to the next best thing" from a marketing point of view is just reasonable.

Here's what I mean. At first there is a click, then comes the "full throttle" outbut for maybe 1/20 of a second. Played from Qobuz (Exclusive mode with changing sample rate). (Not shown in the footage: When I set sample rate to a fixed e/g 24 Bit 192 kHz then there's just the clicks but not the...

And don't forget about a pair of low capacitance XLR to TRS cables when buying... https://www.adamhall.com/shop/us-en/cables-connectors/pre-assembled-cables/balanced-cables/3394/5-star-bmv-0050

If your question is more related to purchase advice people commenting in that⬇ forum are happy to welcome you. Just open a new thread in there. https://www.audiosciencereview.com/forum/index.php?forums/audio-newbie-beginner-technical-forum.46/

1) higher likelihood of "sudden death" of that DAC compared to an integrated DAC 2) lesser likelihood of defects, customer service, warranty

Indeed I think it will be some sort of "adhesive sound film" one day which won't cost more than a roll of LED illumination tape on Aliexpress. Yet giving the most expensive beryllium and kraton equipped speakers a run.