Shenzhenaudio discord server. One of the mods named kr0mka has measured various dongles, including the ADC, which has been informative for me and others looking for this information. Apple dongle was never a default recommendation due to the Android and EU restrictions imposed by Apple. On top of that counterfeits are sometimes sold on legitimate marketplaces like Amazon.
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JCALLY JM20 Headphone Dongle Review
- Thread starter amirm
- Start date
wpzdm
Member
They didn't publish anything about the internals?As a possible alternative to the jcally or apple dongle we have the new moondrop usb c dongles, available in 3.5mm or 4.4mm. I’ve ordered a 4.4mm so we’ll see what I think of it when it arrives,
The specs don't look particularly interesting, anything about the output power?
When it comes to unknown ones, I think the new Hi-Pro is more promising as it looks like CS-Pro CS43131 (I have one, its fine), but runs on CS43198 (with SA9312L) while around the same price of $20-25
https://aliexpress.com/item/1005008275510963.html
I think whoever is the manufacturer, is the same as of
CX-Pro CX31993 (good)
CX-DAC (CX31993 + Max97220, so JM6 Pro config)
ES-Pro ES9318 (that one is bad imo, and below 1Vrms despite some descriptions saying otherwise)
Hi-Max CB1200AU ($3, just got it, haven't tested yet)
Hi-DAC ALC5686 (2 variants - available in CX-Pro and ES-Pro enclosures)
CS-DSD CS43131 (enclosure like in ES-Pro, no longer in sale for quite a while)
MINOR WHITE
Member
HOW DO THEY MAKE SOMETHING SO EFFECTIVE AND MEASURES SO WELL, IN A FREAKING TINY LITTLE PACKAGE?!?!?!
"By the numbers", this DAC has almost the same stats as my $1600 Bel Canto DAC 2.7!!!!
HOW DO THEY DO THAT?!?!!?!?
Easily, I guess. You are asking the wrong question. How does a company make a desktop DAC with marginally better performance and charge 1600 dollars?
Wondering am I gonna need the JM20 pro to drive the new upcoming Truthear Blue 2s, currently the JM12 with Fiio firmware drive perfectly the Zero 2s with the 5 band PEQ and I'm gonna leave those IEMs to my wife. Should I just get another JM12 or order JM20 pro since taking into account the current Reds are less sensitive. I guess there won't be any audible difference between the two, besides finer tunning with 9 band PEQ.
They might both have the same output level in practice given the CS43131 impedence sensing limits output.
JM20-Pro with Walk Play app: it’s actually 8x PEQ filters, peak only, whereas the JM12 w/ FiiO fw gives you 5x PEQ filters, peak, low-shelf, or high-shelf.
Another difference: FiiO Control is available as an Android app and a WebApp. Walk Play is Android only and less polished (does the job though).
Oh yes indeed, only at 600 oms it out puts 2vrms, so both output 28mw give or take per channel at 32 oms, right?
@CedarX
I'm unable for some reason to set Crin's target of 5128. Both difuse ones are basically flat tilted down. Soundguys target on which I managed to EQ the Zero 2s sound pretty good to me.
Crinacle's 5128 Graph Tool | Hangout.Audio
Compare graphs from the world's largest public database of ITU-T P.57 Type 4.3 IEM measurements, maintained by Crinacle.
graph.hangout.audio
Anyway how I can save/import different targets in both hangout and autoeq? Autoeq looks quite more powerful but I can only find harman curve which I strongly dislike in the treble.
I use AutoEQ quite a lot to get an EQ starting point--usually Harman IE 2019 (IEMs) or Harman OE 2018 (headphones). From there, I explore around until I find an EQ I like.
In AutoEQ main window:
If you click "Show advanced" in the "Profiles" section, you can select a target among ~10, including "Diffuse Field 5128" if it's what you like to start from:
You can also click on the 'File' symbol in the right side of the target field, and it'll let you import whatever target you want in the form of a CSV (text) file:
Oh, and AutoEQ also let you import your own measurement file, for example downloaded from Amir's measurements. So, you can import your custom measurements and custom target and let AutoEQ do the optimization for you,.
In the "Select equalizer app" section, the "Custom Parametric EQ" approximates whatever target you selected with 5x PEQ filters, including a low-shelf and a high-shelf filter, which is exactly wat the JM12/JA11 expects:
You can export these as a file, but I usually just enter the filters parameters manually in the app or WebApp.
If you delete the low-shelf and high-shelf filters and add 5x new filters, you get the PEQ parameters for 8x peak filters, which is what JM20-Pro / Walk Play expect:
I personally set AutoEQ to use only ~3-4 filters, keeping the extra ones to "explore around" (IMHO, if an IEM needs more than 3-4 filters to match a target curve... it's probably not worth the efforts anyway !!!). I seldom mess with the other optimization parameters in AutoEQ: there are many... but again IMO, the EQ'd FR is a starting point, with no need to be very accurate.
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Given that i doubt you'll ever really need more power with iems, you can always trick the CS43131 autosensing with a short 3.5mm trs extension. Connecting the extension first without the iems it will be set to high gain, then you connect the iems and you are done.
staticV3
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FYI, the JM20 will jump to 2Vrms somewhere between 180 and 210Ω:
2Vrms at lower impedances is possible by tricking the auto gain.
From the version 2.92 TIDAL do NOT send the audio to DAC but to Android path.
D4Countercy
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Do you think it have any problem with my Simgot ew200 because it has very high sensitivity. Jm20 max has strong power so I am a little bit scare of noise floor & driver damage
At rated 126 dbV for the EW200 with both you can blow your ears much before than the drivers
Standard JM 20 is much more than enough to drive EW200, only advantage you could potentially get with the Max is that it probably will drive EW200 16 ohms with less thd due to its additional op-amp, since CS43131 alone tend to have an increase in thd+n at lower impedance loads. Anyway it will not rise over -90 db, so still perfectly fine for what concerns audibility.
Just get JM12 and flash it with Fiio firmware for JA11
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Or , just don't turn it up too high
its 1/4.5 of the cost of jm20 max, but guess he can use 1/4 of the volume too
Like stated above, you should be more afraid of hearing damage instead of driver damage
However, I have not heard any hiss with the JM20 Max with any of my IEMs. I mostly use PRX which is not very sensitive, but also a Zenith which is quite sensitive. (EDIT: I don't exactly have a quiet environment though, at the very least I'll have traffic noise and air condition hum masking possible noise and I also hear my bloodflow and heartbeat in my ears, which is annoying, so I am not good at estimating noise).
Depending on your source/software you might run into an issue where the volume setting intervals are just too big with the JM20 Max - I mean push the volume up once and it's a bit too loud, and push it down once and it's a bit too quiet and you have nothing in between.
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