so, 😉 because i´ve got now the possibility to change the 7 different-filters „on the fly“ (on the ES9038Q2M), means no annoying jumper settings, and via BT or web-control, i can say/state a little bit to my impressions about it:
I tested it via jumper (manually) a few weeks ago and at that time i´ve got the feel that it makes a huge difference, up about to 20%, and i really loved the „linear phase fast roll-off filter“ (JP3+JP6).. but, now, yesterday, i didnt feel it was such a huge difference, only about to 1-2% !! the other „circumstances“, quality of the source, the right op-amp, the quality of the power-supply (15V and or +/- 15V) have absolutely a really greater impact of the sound/tune.. The filter here on the ES9038 are really on the digital/sample-site, there is no more 3D, spacious or something and had almost no effect on the „true original“-tune.. if u really like the bitperfect, faithful, „true to original“ tune, u have to improve your hi-fi in another place.. with the different filter u hear something more expressed (or decreased) but the overall „sound/tune“ stays the same.. so, in this case, i/u have to work more on the power-supply-side, onboard voltage supply on these Chinese-ES9038Q2-boards/cable/source-material and so on (as said). On the other hand are there a few differences in the „sound/tune“->here is a very interesting picture from stereo.net.au->https://www.stereo.net.au/forums/topic/81435-ak4490eq-filter-adjustment/, its about filter settings on an AK4490EQ, but the basics are the same..(i´ve also posted a few month ago an article about different-filter-types and the impact on the sabres from resonessence-labs („Invicta-Mirus“)-> http://essabre-90xx-rpi.sfb2.com/forum/showthread.php?tid=21 and i got/have almost the exact feel about it !!
very interesting is also this „Sound Source Positioning“->had the exact impression in changing from one filter to another->also thought „..this voice/guitar/something is more in the back or in the front..“ and so on (normal hi-fi experience) !! Summary: u can hear/have differences, the filter on this board have not soo much impact (imo), but also try to improve your hi-fi in another place !!
so, 😉 got yesterday my „NodeMCU V3“ IoT-module->approx..2,60€ Aliexpress/Ebay/Bangood etc.. really freaky/whacky 😉 .. i just tried something out; have to wait here for other things/“items“ 😉 to come.. It has a full 802.11 b/g/n WLAN onboard and can fully work as a webserver; its much faster than an Arduino and has also programmable GPIO-pins.. and u can fully use the Arduino-IDE.. anyway, wrote a little sketch, can now access to it via Wlan and can select the source and the different-filter on the ES9038Q2M.. u can also use some HTML-Slider to adjust maybe the onboard HW-Volume-Control (and then via some digi-poti->http://essabre-90xx-rpi.sfb2.com/2018/02/es9038q2m-project-2-building-a-bt-controlled-hw-volume-control-digital-pot-10kohm-mcp4131/).. but originally i wanted to control our lovely „DIY-DAC“ via Bluetooth; but a web-interface could also be an (additional) option.. so only some „tech-demo“-pics.. (but this NodeMCU is really,really freaky „stuff“ 😉 ) (i could here only test two filter right now :“BrickWall“ and „minimum phase fast roll-off“ and i must say to my degrace: i´ve heard no difference 😉 (but could be also a wiring-problem; have to evaluate more)(but tested it via Jumper some weeks ago and „Minimum-Phase-Slow-Roll-Off“ and „Linear-Phase-Fast-roll off“ looks the most promising (for me)).. but i will test it more…
and so, 😉 we are now here again with a main „Hi-Fi“-theme/problem: „Clean-/clear-/power“ and Power-Supplies“ 😉 .. It´s all about the right-/clean power, voltage-regulator-/stabilizer.. i´m very often in this very good forum concerning all these electrical things/also concerning the ES9038Q2M-> http://www.diyaudio.com/forums/digital-line-level/314935-es9038q2m-board-38.html so, and i came again to this subject (matter), cause i had/these „stuttering“-problems again with the Skysong-/Singxer-USB-bridge+the ES9038Q2M.. first i thought it´s mainly a driver problem but meanwhile i guess it could also be a power-supply problem->5V on the USB-bridge via USB !! (500mA); could really be a problem(-„stable-wise“).. I came by it because i (try to) made a DIY-power-supply with a 32V-HP-power supply for some printer + a cheap „Step-down-power regulator/supply“ from Aliexpress-> http://essabre-90xx-rpi.sfb2.com/2018/01/diy-make-your-own-15v-dc-power-supply-for-es9038q2m-or-other-the-cheap-way/ it had 625mA and i thought this should be enough cause i´ve read elsewhere that the ES9038Q2M only needs roundabout 200mA.. I connected my ES9028Q2M with this regulator and (adjusted it down to 15V) to my raspberry and got a horrible, horrible stuttering !! thought first it was a software-problem but wasnt..asked some user in the forum and they told me that some power-supplies may become „unstable“ with/on „low-load“.. anyway this brings my again to the above „topic“ and now i think i better use a 5V-stand alone-power supply with minimum 1A for my USB-bridge (the Skysong-/Singxer have the possibility via a barrel-jack).. by that i´ve ordered some other 15V-power supply with „stable“ 2A for the ES9038Q2M.. where we so come back to the main „theme“: Dual 15V for the ES9038Q2M and power-supplies in general..see above 😉
(the pictures are from „Markw4“ from the above mentioned forum; hope i can use them here, there are just to „illustrate“; if not please some e-mail)
so, 😉 came by chance about this facts/post in this very interesting forum->http://www.diyaudio.com/forums/pc-based/302687-es9018k2m-es9028q2m-9038q2m-dsd-i2s-dac-hats-raspberry-pi-17.html „iancanada“ posted:“..ES9018 and ES9028 need the small DoP daughter board (which can be plugged in the IsolatorPi) to convert the DoP stream into DSD. However ES9038Q2M has a built in DoP decoder, so, for ES9038Q2M, the DoP daughter board is not a must.“, +“ESS9018/28/38 has internal 32bit digital volume control. Much better than any 24bit digital volume control, but still not as good as the analog one on my PASS XP-10. However according to my listening experience, the difference is not that huge.“..
by that his „ES9038Q2M DAC HAT“ looks very fine, neat and „sophisticated“ 😉 ; mail him..😉 (also very interesting other (DIY-Audio) projects there !! ->https://github.com/iancanada)
so, 😉 sorry, i´ve just seen that it was impossible for unregistered user/guests to see any content in the forum->forget to uncheck „Force Guests to register/login to access the full content„(it was, as i hardly remember, because of the f***** spam-attacks); its solved now..->FORUM second i´ve made a new post how to change the „identifier/baudrate/pin“ of a HC-06-BT-module->http://essabre-90xx-rpi.sfb2.com/forum/showthread.php?tid=34 third i´ve updated to „DietPi 6.4„->http://dietpi.com/ and it plays here soo very well with my „ES9028Q2M“->absolute wonderful..(just connected 2 DIP-buttons via a breadboard to the 8 pin HW-control on it..); soo nice..(i will also try in future to solve/control it via some BT/Arduino-control) fourth i´ve installed/set up a „search„-widget in the upper right..thought it was already there but wasn´t 😉
(i will try to use some bitmaps/icons in future (like in the hifi-duino-project) but at present its really difficult for me to „include“ them/set them up in the sketch, also because of the very low ram-resources on an arduino (on a NodeMCU v3 for example u have up to 32MB flash and not max 256kb!! like on an Arduino (Mega2560))-there are some ways to optimize it, but for now i´m glad to got it to work at all 😉 )