Note: Before you buy this product, please read the FAQ carefully.

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#9038D6K

According to multiple headfiers requests: 3.5mm jack unbalanced output DAC HPA 180mW@32ohm in the same case as #9038SG3. The same as 9038SG3, 9038D6K will work with Tweak app. The DAC has virtually zero noise modulation behavior.

Specifications:

Status: Production

Materials: Sandblasted/black anodized aluminum/laser mark/ES9038Q2M/OPA1622/OPA1602

Susumu resistors, Murata C0G caps, AVX tantalum caps, Taiwanese connectors
Dimensions: 48x22x9mm
Weight: 12g
Power: USB 5V rail no internal battery, 105mA idle current, the device contains >6000uF of capacitance for the power rails filtering
Input: USB-C, PCM up to 32b/384kHz, DSD256
USB bridge Comtrue CT7601CR custom FW
Output: Standard unbalanced output 3.5mm jack, HW volume control .5db/step
Output impedance: .07 Ohm@1000Hz Agilent U1733C
Output power:
180mW@32 Ohm@1kHz@THD=1%
120mW@16 Ohm@1kHz@THD=1%
Measured at .5dbFS level, typical PC USB2 port powered
The hot unit produces less power
Frequency Response: 5-80kHz .05/-1db@ 32b/384kHz
SNR=DR@50MHz_MCLK:  126db(A) typical, referenced to 2.75VRMS

100% units are calibrated with the result printed on the case, >124db(A) is normal grade

Please note, any user with Cosmos APU may calibrate 9038D by themself for particular headphones.
INAD@[email protected] BW 22-22kHz 118-120 db typical for 32b/44.1kHz@no-load
THD@[email protected] BW 22-22kHz <.0001% typical for 24b/44.1kHz@no-load
THD N@[email protected] BW 22-22kHz .00018%, SINAD 115db typical 24b/44.1kHz@32ohmTHD N@1kHz@-7dbFS BW 22-22kHz .0005% typical for 24b/44.1kHz@16ohm(-6dbfs correspods 120mW)
Crosstalk: -135db@1kHz no-load,
-82db@1kHz 32ohm load
The Windows driver is here.
FW tools are here
Warning: 9038D6K contains a high-sensitive I/V stage that may cause audible noise when your phone uses LTE,4G,5G.

 

Tech appendix

Conventional PC USB2 port, 10Kohm load THD N vs time

Conventional PC USB2 port, 32ohm load THD N vs time

Conventional PC USB2 port, AES17 Dynamic Range A-weighted vs time