USB-C CABLE DONGLE · KT02H20
JCALLY JM12
A USB-C cable dongle with a KT02H20 DAC chip, a 3.5 mm output and a built-in mic. About 6 g.
POWER AT 32 Ω27.5mW3.5 mm, per channel not stated
OUTPUT IMPEDANCENot statedNo data from the manufacturer
SNR112dBas JCALLY states it
PRICE$6.99Lowest price at Hangout Audio
OUTPUTS3.5 mm
DAC CHIPKT02H20
PARAMETRIC EQ5 bandspeak; not stated by JCALLY
CONTOURNot supported
Numbers are the manufacturer's stated figures unless marked as measured; sources linked below.
Outputs and power
3.5 mm
27.5mWat 32 Ω
Spec image: 27.5 mW at 32 Ω, per channel or both channels not stated
Output impedance -
SNR112 dB
Dynamic range113 dB
Distortion-87 dB (JCALLY does not say THD or THD+N)
Crosstalk-52 dB
Frequency response20 Hz - 20 kHz
Not stated: gain, supply voltage.
Is it enough for your headphones?
JCALLY rates the JM12 at 27.5 mW into 32 Ω. Below is how much of that is left to spare for each kind of headphones when you listen loud, with peaks at 110 dB. A figure marked est. is worked out from that rating.
Sensitive IEMsMulti-driver sets that hiss on strong sources
needs 0.6 mWest. 14 mW at 16 Ω+13 dBMost IEMsTypical in-ears, 16 to 50 Ω
needs 3.2 mW27.5 mW at 32 Ω+9 dBEasy-to-drive headphonesClosed and portable, 32 Ω
needs 16 mW27.5 mW at 32 Ω+2 dBHard-to-drive headphones300 Ω, HD 600 class, hungry for voltage
needs 20 mWest. 2.9 mW at 300 Ω8 dB shortMost planarsPlanar magnetic, low impedance, need current
needs 50 mW27.5 mW at 32 Ω3 dB shortDemanding planarsThe hardest loads, desktop territory
needs 251 mWest. 15 mW at 60 Ω12 dB shortWhere to buy
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The device
From JCALLY's spec images unless markedInputUSB-C
FormatsPCM up to 32-bit / 384 kHz, DSD128
DAC chipKT02H20
MicHas both inline control and call functions
BuildDie-cast aluminium alloy shell, anodised with 180-mesh fine sandblast; 28AWG*4C large-channel silver-plated conductor, with silver-foil shielding wrap
Parametric EQ5 bands over USB with devicePEQ (open source); JCALLY does not state it. Not supported in Contour.github.com
Length110 ± 10 mm
WeightAbout 6 g, about 14.7 g with packaging
How it stacks up against the competition
Power at 32 Ω · price in US dollars- Nearby
- Same DAC chip
- Most IEMs, 3.2 mW
Compared with
Manufacturers' stated figures; the price is today's lowestJCALLY JM12 vs JCALLY JM6 PRO
At 32 Ω JCALLY JM12 is listed at 27.5 mW and JCALLY JM6 PRO at 60 mW; the lowest prices are $6.99 and $14.99, $8 apart.
| JCALLY JM12 | JCALLY JM6 PRO | |
|---|---|---|
| Power at 32 Ω | 27.5 mW3.5 mm, socket not printed; the only headphone output | 60 mW3.5 mm, socket not printed; the only headphone output |
| Price today | $6.99Hangout Audio, 7 Nov | $14.99Hangout Audio, 7 Nov |
| DAC chip | KT02H20 | Conexant CX31993 |
| Inputs | USB-C | USB-C |
| Outputs | 3.5 mm | 3.5 mm |
| Size | 110 ± 10 mm | 110 ± 10 mm |
| Weight | About 6 g | About 6 g |
More like this
Sources
Checked 6 Nov 2026wanwang.xin · the spec image
Used for power, noise and distortion, frequency response, formats, the DAC chip, size, weight and build