I think it safe to say that JM20 measures better than JA11/JM12. But then, measurements vs. features… it’s all about what one values.The only thing they offer is the EQ,
I have a bunch of these DSP-enabled dongles & cables that I leave permanently attached to the IEM (or headphones): they are cheap enough, and they allow me to tinker with the EQ once, and get something that works for me. So that, in the end, I get IEMs (or HPs) with a ubiquitous USB-C connection and a FR tailored to my taste.
I may still hear differences… but that’s the fun part for me: finding what it is I hear, and whether I prefer it or not.
Can’t do any of that with JM20, need an upstream app which for me, is less convenient…
For most of my IEMs (and actually, a bunch of my HPs), JA11 is “good enough” measurements), and has this killer feature (PEQ) that I value the most.
I also have a few of these—because of the 8x PEQ feature. The CBHT chips (CB1200AU, CB5100pro) appear to be custom versions of the Space Touch SPV4040 (or SPV5048 in the case of CB5100?).I've got Hi-MAX dongle, the CX-Pro cousin based on CB1200AU
SPV4040 spec: DAC SNR 105dB,THD+N -90dB. Would need measurements to confirm, but I’m not sure they’re much better than the KT02H20 from JA11.
Probably “good enough”… and only $3: great if it’s what you value!sold at $3, but couldn't even bother to do a proper listening test on it (sounds ok on a quick listen though