USB-C CABLE DONGLE · SPV4040
JCALLY JM11
A USB-C cable dongle with an SPV4040 DAC chip, a 3.5 mm output and a built-in mic. About 7 g.
POWER AT 32 Ω10.5mW3.5 mm, per channel not stated
OUTPUT IMPEDANCENot statedNo data from the manufacturer
SNR100dBas JCALLY states it
PRICENo price yet
OUTPUTS3.5 mm
DAC CHIPSPV4040
PARAMETRIC EQNot statedJCALLY lists none
CONTOURNot supported
Numbers are the manufacturer's stated figures unless marked as measured; sources linked below.
Outputs and power
3.5 mm
10.5mWat 32 Ω
Spec image: 10.5 mW at 32 Ω, per channel or both channels not stated
Output impedance -
SNR100 dB
Dynamic range100 dB
Distortion-85 dB (JCALLY does not say THD or THD+N)
Crosstalk-80 dB
Frequency response20 Hz - 20 kHz
Not stated: gain, supply voltage.
The table row output load: adaptive 16Ω～300Ω (original: 输出负载 自适应16Ω～300Ω) states a supported headphone load range; the catalog keeps output impedance empty.
Is it enough for your headphones?
JCALLY rates the JM11 at 10.5 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. 5.3 mW at 16 Ω+9 dBMost IEMsTypical in-ears, 16 to 50 Ω
needs 3.2 mW10.5 mW at 32 Ω+5 dBEasy-to-drive headphonesClosed and portable, 32 Ω
needs 16 mW10.5 mW at 32 Ω2 dB shortHard-to-drive headphones300 Ω, HD 600 class, hungry for voltage
needs 20 mWest. 1.1 mW at 300 Ω13 dB shortMost planarsPlanar magnetic, low impedance, need current
needs 50 mW10.5 mW at 32 Ω7 dB shortDemanding planarsThe hardest loads, desktop territory
needs 251 mWest. 5.6 mW at 60 Ω17 dB shortThe device
From JCALLY's spec images unless markedInputUSB-C
FormatsPCM up to 32-bit / 384 kHz
DAC chipSPV4040
Mic16bits/48KHz
BuildDie-cast aluminium alloy shell, anodised with 180-mesh fine sandblast; 8-strand oxygen-free copper silver-plated wire
Parametric EQNo data from the manufacturer. Not supported in Contour.
Length110 ± 10 mm
WeightAbout 7 g
Devices with the same DAC chip
SPV4040 · 2 devices use itCrinEarWorks with ContourProtocol Micro30 mW<0.4 ΩWorks with Contour8 bands$9.9930 mW · <0.4 Ω · $9.99PEQ Yes, 8 bands
More like this
Sources
Checked 6 Nov 2026wanwang.xin · the spec image
Used for power, output impedance, noise and distortion, frequency response, formats, the DAC chip, microphone, size, weight and build