I dislike your attitude towards me. Be aware that I am not obliged to prove anything, if you do not like my comments just ignore them. I appreciate amirs work, but there is no point in measuring a hobby project by him. For your reference I add a picture of one of my PBTL PCBs specially for battery operation. And yes, they measure well with REW and ARTA.
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Deleted member 148505
Sylph-D200 MKII will fit in 49mm height chassis. But there's no provision/circuit for hot plugging the 48V supply, so the power supply should be in the same enclosure which I think will not fit in that dimension.
Here's the chassis used in ASR.
Full aluminum DIY 2409 silver power amplifier chassis psu enclosure HIFI preamp box dac case 240*90*320mm
https://a.aliexpress.com/_mPya0Km
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Deleted member 148505
Would like to clarify that 'random' means it only occurs on certain sources like some usb dongles.
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Deleted member 148505
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Deleted member 148505
Hi Lester,
I recently received the SYLPH-D200 MkII amp.
I also read the review of the amp on AudioScience Review where the review was very favorable. In the review thread, you reported some positive listening test results with using the Burson V5i-D op amps.
https://www.audiosciencereview.com/...ifier-module-review.25295/page-9#post-1144174
I have a pair of these that are in a slightly modified Aiyima A04 (TPA-3251) amp. Do you still maintain that the Burson V5i-D op amps are a good upgrade to the SYLPH-D200 Mk II?
I recently received the SYLPH-D200 MkII amp.
I also read the review of the amp on AudioScience Review where the review was very favorable. In the review thread, you reported some positive listening test results with using the Burson V5i-D op amps.
https://www.audiosciencereview.com/...ifier-module-review.25295/page-9#post-1144174
I have a pair of these that are in a slightly modified Aiyima A04 (TPA-3251) amp. Do you still maintain that the Burson V5i-D op amps are a good upgrade to the SYLPH-D200 Mk II?
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Deleted member 148505
Burson V5i-D is good, nice highs and soundstage, but it may sound flat on TPA3255. IT sounds like LME49720 but with better details. Choice of frontend opamp also depends on your source and speakers.
I think Burson V5i-D is fit on TPA3251 since non-PFFB TPA3251 has a character into it, like the instruments on it are ‘live’ sounding. So adding a neutral sounding opamp is good.
I think Burson V5i-D is fit on TPA3251 since non-PFFB TPA3251 has a character into it, like the instruments on it are ‘live’ sounding. So adding a neutral sounding opamp is good.
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Deleted member 148505
I think I can recommend this power supply for those who are looking for 'cheap' switching supplies.
Just add an external EMI filter, and/or additional filter caps.
I actually like the sound of this smps better than LRS-350-36, though the LRS-350-36 has flawless FFT spectrum measurements.
Sound is thicker, and there's no sibilance (when using LRS-350-36, sometimes it has a slight Zzz superimposed on Sss sound). Though I upgraded the to-220 rectifiers on this and replaced the output filter caps.
Just add an external EMI filter, and/or additional filter caps.
I actually like the sound of this smps better than LRS-350-36, though the LRS-350-36 has flawless FFT spectrum measurements.
Sound is thicker, and there's no sibilance (when using LRS-350-36, sometimes it has a slight Zzz superimposed on Sss sound). Though I upgraded the to-220 rectifiers on this and replaced the output filter caps.
Attachments
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Deleted member 148505
Bought this locally (Lazada). Just look for similar items on aliexpress with good ratings / review.
Using this switching supply will add lots of 60hz mains harmonics on the FFT spectrum (peaks around -100dB).
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Deleted member 148505
I'll take this back, after a couple of days, the vocals are now comparable with the silmic II and sounds more balanced. We will put these caps as the default input coupling caps for Sylph-D modules going forward. (we still have hundreds of silmic II, btw)
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Deleted member 148505
The ATS heatsink used on Sylph-D modules (and on TPA3255 EVM) might get hot on idle like around 50deg C, but you will never experience overtemp fault condition on near clipping music playback, even on full power sine wave tests, it will hold on its own unlike other retrofit heatsinks which typically have poor contacts on the IC surface, they would not be able to cope up with a sudden large thermal output from the IC compared to the ATS heatsink which is really designed for HTSSOP-44 IC package.
Though sometimes I’m daydreaming of attaching a heatpipe from ATS heatsink going to the chassis so that the idle temp will be better.
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Hi Lester 
And why not that with a big box ->
https://www.amazon.fr/ASUS-RYUJIN-w...prefix=rog+ryujin+ii+360,computers,124&sr=1-2
And why not that with a big box ->
https://www.amazon.fr/ASUS-RYUJIN-w...prefix=rog+ryujin+ii+360,computers,124&sr=1-2