Its quite old dongle actually, but nice to see it is good, I honestly didn't think it will measure even better than Tempotec Sonata HD Pro.
And I wonder if the recent Max version can be flashed with FiiO KA11 firmware just like JCAlly JM12 is flashable with FiiO JA11 firmware.
So far we know JM12 = JA11 (with lower noise floor I recall from the topic on ASR?), and also JCAlly AP7 = Sevenhertz 71 (same PCB), but with detachable cable and lower price. One of the AP series higher numbers also shares the case with some other brand's dongles.
I don't know if it will be of use for anyone, but here are all the JCAlly USB dongles I found written down in my notepad, the specs are taken from AliExpress seller's pages and can (likely are, including additional chips) incorrect at places, I skipped all on Realtek as didn't like my Avani.
JCAlly JM6 - CX31993, 1Vrms
JCAlly JM6 Pro - CX31993 (Max97220), 60mW@32Ohm 7.4mW@600Ohm
JCAlly JM7 - CX31993, 1Vrms
JCAlly JM08C - KT0210, 1Vrms
JCAlly JM09 - CS46L41, 25mW@32Ohm 8.6mW@100Ohm
JCAlly JM10 Pro - CS43131, 2Vrms
JCAlly JM11 - SPV4040, 10.5mW@32Ohm
JCAlly JM12 - KT02H20, 1Vrms //FiiO JA11 firmware compatible
JCAlly JM20 Pro - CS43131, 2Vrms
JCAlly JM25 - ES9318C (SA9312L), 35.15mW@16Ohm 1.2mW@600Ohm
JCAlly JM30 - CS43131 (SL9123L), 2Vrms, 31.25mW@32Ohm 6.7mW@600Ohm
JCAlly JM40 - ES9280C Pro, 2Vrms
JCAlly JM60 - ES9038Q2M (ES9603Q SA9317L RT1239Q), 2.2Vrms
JCAlly AP7 - AK4377, 1Vrms //Sevenhertz 71 PCB
JCAlly AP10 - 2x CS43131 1.8/3.8Vrms
JCAlly AP90 - 2x AK4493SEQ (CT601PR), 2/4Vrms, 125mW/240mW@32Ohm
JCAlly AP98 - 2x CS43198 (CT601PR), 2/4Vrms
I found this
review online..
It has weaknesses would you believe:
I was going to say I recall Andy/donglemadness bashing JM20 so much, that even though I consider his reviews a SciFi, it made me look at JM10 Pro instead (I ended up with CS-Pro CS43131 as it was the cheapest). I kind of lost my marbles after he compared output power of VE Odo (KT02H20, under 1Vrms) and JCAlly JM6 Pro (CX31993 with Max97220, 1.6Vrms+ impedance dependent) using 32Ohm Sundara...