OP-Amps: finally the AD797s arrived / a lot of room / fine-tune / laid-back sound / not such a „revelation“..

so 😉 ,
today my long awaited AD797s arrived..


first impressions:
a lot of „room“, almost „a laid-back“-sound, misses a bit the „liveliness“ from OPA2134, the „contur“ from the LME49710s and the „harmonics“ from the Muses8920 😉 .. (not so „spectacular“)
but again a bit less distorted and with more dynamics-(range)-THD..
in this case (at this level) i think its also very important in which different „devices“ u use the different-OP-Amps; voltage-wise and so on..
i´ve tested all the OP-AmPs on an ES9028Q2M (and some on the ES9038Q2M) with Volumio (on a pi) at full volume (no software-mixer)+ some with a Skysong-USB-bridge..(Win)
i think these needs more „burn-in/play-in“-time than the other..very „fine/high-resolution“-tone..
(i will then maybe post an update..)..
Conclusion (for now): not such a „revelation“ as the other (Muses8920, LME49710, OPA2134) but very fine, room, laid back sound..
if i had to choose between these 3 OP-Amps (Muses8920, LME49710 ,AD797) it would be really very very difficult „task“, because they are really very „close/tight“ to each other with different advantages/disadvantages..
hmm..
the best for u would be, you order all the 3 (4) 😉 and get this „different-OP-Amp“-experience too..really..it was such a fun to „hear-out“ the differences, where others say that they even wouldn´t exist ..
fabulous, so much fun 😉 ..
so, i guess i would stick with my „allround“ Muses8920; guess its the best for now on this „cheap-manufactored“ chinese-boards..on more high-end equipment the AD797+LME49710s could be the better choice..
(but as also said,very very difficult to choose, maybe i´ll swap then again 😉 )..

so, another „building-lot“ is my combined ESP32S Bluetooth/Webcontrol now with the 4-port-relay for the filter settings + the MCP4131 (Digi-Poti) for the stepless HW-volume-control..
I´ve attached today my Mega2560 with an 3.5″ display via hardwareserial to it (rx,tx)(because i havent got the right libraries+pins+connections to set it also up on the ESP32s..)


i will have just to work out the right display/layout/font-settings (a lot of work anyway)..maybe i will also display some track-information on it->like Artist,Title, fileformat , length and so on..in Moode by example u can use a python script to send out some metadata-info…
a lot of possibilities and by the way, i don´t want to miss my HW-volume-control via Digi-Poti since some days anymore..
u have, as said, again a more finer/better option to adjust the overall volume..absolutely fine with these HW-volume control on the ES9038Q2M..


more to come, many greets and stay „tuned“ 😉

Op-Amps: LME49710 vs. Muses8920/LME49720/OPA2134 ->more „contur“

so, 😉
got finally today my Dual-Dip 8 converter (1,45€ Ebay) LINK->

that i can use my bought, nice „LME49710“-s (they are single)->

first impressions:
a lot of „contur“; more than the Muses8920; but no so „lively“ as an OPA2134 for example (or the Muses.)
i guess its absolutely because of the lower distortion; also a little bit „cold“ (all only my impressions; some would feel maybe different about it)..
but its also a „high-class“-duo/OP-AMP ; see this table again->

(and curiously absolutely exact my impressions about them; in only hearing them „out“ here..)

Conclusion (Ranking Op-Amps at present(for me)):
1. still the Muses8920, but really tight behind-> ((update 2hrs later: i don´t get it; everytime i plug the Muses back-in again, i´ve got everytime the feel:“thats really hifi !“; such warmth+musicality..so „harmonic“ (must have something to do with the 2nd and 3th grade harmonics and so on))
2. LME49710; about 4-10% (IMO 😉 (more „clinical“+“contur“; has also its advantages))
3. OPA2134 (because of its „lively/airy attitude“)->10-15% back (to the LME49710)
4. LME49720 (for me a little bit to thin; but also very good in the „highs“) ->2%-5%

and very interesting would be how the AD797 were „performing“; i had an AD1988 as soundchip and as i hardly remember they were absolutely „sweet“ in the highs; never had such a fine resolution (mainly in the middle/highs)..
+ the „Bugatti Veyron“(->Link) of the OP-Amps, the OPA627 😉 ..
so, at present i will stuck with my „Muses8920“ although the LME49710s are absolutely close to them (maybe better in some „scope“)
greets for now 😉 (and thats all only my impressions; they are all very close and it depends really on your personal taste !!)

Again: The „..there are no differences between Op-Amps“- fable !! (OPA2134-NE5532-Muses8920)

so, 😉
again: i´ve changed the NE5532 on the ES9018K2m today to an „OPA2134“ and i hear absolutely great differences..
The OPA2134 is very „airy“,“lively“ (in comparison to the NE5532) see this post:->http://essabre-90xx-rpi.sfb2.com/2018/04/op-amps-ne5532-vs-opa2134-vs-muses-8920-02-essabre-link-dietpi-6-5/
and has (brings back) a certain „glance“ in the high-middles/highs..and this is all too because its very less „distorted“ than a NE5532 par example..
okay, it misses a little bit the „push“ from a NE5532->all said and written in the above mentioned post and some other..
(update: for me also too „thin“; but for this we have our lovely „Muses8920“ 😉 )
but the main fact is that there are absolutely great differences; okay i have here a Cambridge Audio Azur 540A amplifier and some phenomenal Mission-Cyrus-speaker; so more „monitor/neutral/british“-sound..
but i dont get it, why some people say (like in my „praised“ diyaudio.com-forum too) they hear almost no differences and „..there is to be cleared if its to hear at all“
???
are they (some) completely stupid there or what ? 😉
and such crap i´ve read also as i started to read/buy/change the Op-Amps on our lovely essabre-boards too and this „comments“ almost hindered me to start it at all..
so, to come back to start:
upshot: there are great differences by the different OP-Amps and u can hear it loud and clear !! 😉

Wonderful pics -> DIY-project by Terry (ES9038Q2M+Kali reclocker) + LME49720 impressions + ESP32S

first, 😉
here is some beautiful pic by „Terry“ again on his DIY-audio project (an ES9038Q2M+Kali reclocker i guess); wonderfulst !!
also the attached TFTLCD-solution->the layout of the screen and so on..
a treasure chest on ideas for other user in building their own DACs !! fabulous !! so many thx again !! (we´ll maybe get more pictures in future !)

second,
the LME49720 just arrived; i tested it here on an ES9028Q2M (DietPi-ympd, I-Sabre-k2M overlay):
for me too „thin„; it had a lot of air and liveliness/agility but absolutely, as said: „thin“..
after i put my Muses8920 back in i´ve got the feel: thats really hi-fi (with the Muses.)
but meanwhile thats all „whining“ on a high level and it really depends on your personal taste (on this high level->one wants to have more „push“, prefered more „rock“, the other one prefered more „classical“ music/tune and so on..)..
but nevertheless i would prefer the Muses8920 in comparison to the LME49720 by 15-20% 😉
(had not the possibility here right now to check it against the OPA2134/NE5532)..

third,
the Geekcreit ESP32S arrived here yesterday (Link) (5,50€); 2 cores, wlan b/g/n, bluetooth on board, 4 !! spi-s and so on..think about how to use it for the DAC-control (spi-display,source-selection,filter-settings, HW-volume etc.)..

greets for now 😉

ES9038Q2M+Skysong/Singxer XMOS-USB-bridge->(final) thoughts/settings tone optimization

so, 😉
after i tested a lot of different op-amps+filter-settings on the ES9038Q2M (Blue) lately i came to this (final) conclusion:
The Muses 8920, are/“sound“ brilliant on these Blue, i think they are lately called „YJ-ES9038Q2M“ Q2Ms..
much better as with the NE5532 or the OPA2134 for example (other possibility would be the AD797, LMEXXXX (see earlier post))..

by that to provide the Skysong/Singxer USB-bridge with an external 5V power supply also boosted the overall performance of the Bridge by 10-15% !!
absolutely to recommend !! 😉

absolutely wonderful bridge (read elsewhere they should be the „finest“ with the best XMOS-implementation)..(i have the version with the golden crystek cchd957s))..

the filter-settings have here for me not such an impact on the sound/tone, guess 2-3%, max 5% 😉 , but u can hear it if u want..but the differences are really „paper-thin“ (on other DACs/millboards it could have a greater impact)..
by that „kennyliveforever“ made a great post in the forum-> http://essabre-90xx-rpi.sfb2.com/forum/showthread.php?tid=64 about how to include the „original“ essabre-driver (I-Sabre-K2M) for the ES9028Q2M in Volumio (and then maybe in other audio-distros)..
so far for now !!

Op-Amps: NE5532 vs OPA2134 vs. Muses 8920 (02) + ESSabre-Link (+DietPi 6.5)

so, 😉
got yesterday my „OPA2134“ and had finally the time to check it out 😉

okay, fired up my Raspberry with the ES9028Q2M and thought first:“ ? why sound it so „distorted“ ?“ (my main „rig“ is at present->Skysong/Singxer USB-bridge (golden Crystek CCHD957s) + unmodified ES9038Q2M (Blue)..
Changed then the NE5532 to the OPA2134 and the result ?

Surprisingly good !! 😉

bought a few month ago some OPA2604; they were really, really, really bad (in any case on these Sabre-boards)..

This OPA2134 is very lively, airy, is more about middle-highs and really less „distorted“..
you can use them without any problems/thoughts to upgrade your NE5332..!

by that it brings me some „glance“ back (in the highs) which i missed since 5 or 6 years ago, as i had to change my lovely Via VT1828S (onboard) to an „ordinary“ Asus Xonar DX..;-)

changed then to the „Muses 8920“ and ? Better 😉 ..it has the best from both op-amps: this airly, lively (OPA2134) but also the „push“ (NE5532) mainly in the middle-lows..;-)(„its all about the slew-rate“ 😉 ; funny+interesting article here->http://nwavguy.blogspot.de/2011/08/op-amp-measurements.html )
anyway this OPA2134 is as said very good..
the next possibility would be an „AD797“ or some LMEs..(and Burson V5 of course)
ES Sabre itself recommend these „AD797″ + some LMEs (for the ES9006+ES9008 series)..its from a very interesting download->“Maximizing DAC performance…“->http://www.esstech.com/index.php/en/support/downloads (thx to „Mark04“ again, over at the DIY-audio-forum->LINK)

(picture from „janos_904„->hope i could use it here..)

so, and another thing is that i´ve updated to Diet 6.5 and with every version it sounds better and better and the main advantage is that u have meanwhile almost no horrible „pops“ in changing the music-file-format like flac to wav or 44,1 to 192khz for example..
i guess its also because u got a better/fresher raspian-(firmware) everytime u update it via DietPi..
greets for now..

OP-AMPS CHANGE (PART 2)->NE5532 to Muses8920->different, more musicality, very soft..

okay,
this time i changed the onboard NE5532 from the ES9018K2M to Muses8920 and the result is:
Different 😉

first, absolut no comparison to the OPA2604 (in any case to those i had here)->they were really bad..
These Muses8920 have a great musicality, and a very fine resolution but at present it lacks of something (in comparison to the NE5532)..
(so, here i have stop for a moment, because i have to re-check them in a few days..)
more to come…

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