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Topping DX3 Pro v1, DX3 PRO + and Samsung TV toslink output

pattox

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Some years ago I bought the first version of the DX3 pro. Over the past few months I starting using this together with a Samsung TV to send the optical output to powered Yamaha speakers. And that seems to have worked very well with terrific sound quality, no glitches and no momentary interruptions to sound.

Most recently I needed an additional dac and decided to buy the very latest topping DX3 Pro+. Out of curiosity I tried this latest DX3 Pro+ with the tv and speakers. Sound quality was still terrific (and to my ear, identical) but there are occasional momentary dropouts in sound (only apparent with music).

I recall that jitter from the tv optical output might the underlying reason, and occurs when the DX3 Pro+ thinks there is sync error with the tv and recalibrates .
With the v1 DX3 Pro this doesn't seem to happen. I think the V1 uses an AKM chip while the Pro+ uses an ESS chip.

I'd really be interested to find out in more detail about this difference and why this is so.
 

gvl

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Topping blames it on the inferior receiver chips they now have to use after AKM factory fire.
 

Greyfox

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Yes, it will be the ESS chips' low jitter tolerance.
SMSL and some other companies now included DPLL adjustment into ESS DAC-s, which makes them possible to work better with TV optical outs.
I've checked the manual, DX3 PRO+ don't have any option like that. :( Maybe a firmware update in the future could fix this.
 

gvl

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While ESS chips may have something to do with it, the blame was on the SPDIF receiver if memory serves. They used AKM receivers until they became unavailable and then switched to CS8416 and some others that’s when the problems started.
 
OP
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pattox

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Many threads on the forum mention the tv/dac/jitter problem. Its obviously a widespread problem.

It is clear to me that if one plans to use a dac with a tv then the take away

- buy a dac with adjustible dppl: the cheapest I could find was an smsl su-6.
- alternaively a dac with the akm chipset don’t seem to have the problem, not sure why..perhaps becausethey just pass on the signal without trying to relock or correct the jitter?
 
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