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Description
E1DA 9038D6K USB Headphone Amp 3.5mm Jack Unbalanced Output DAC+HPANote: Before you buy this product, please read the FAQ carefully. https: e1dashz. wixsite. com index faq Welcome to join our discord channel. https: discord. gg U9Z28KC #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:
Note: Before you buy this product, please read the FAQ carefully.
Welcome to join our discord channel.
#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.
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 vs 32ohm loads THD+N
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
Frequency response PCM384 Slow Lin. Phase filter 10-40000Hz at -0.2db
Nearly ideal square wave 1kHz PCM384 Slow Lin.Phase filter at 200MHz BW scope
Square wave 1kHz PCM192 Slow Lin.Phase filter at 200MHz BW scope
Square wave 1kHz PCM96 Slow Lin.Phase filter at 200MHz BW scope
Square wave 1kHz PCM44.1 Slow Lin.Phase filter at 200MHz BW scope
24b/44.1kHz 1kHz -0.5dbfs FFT no load
24b/44.1kHz 1kHz -2dbfs 150mW FFT 32ohm load
24b/44.1kHz 1kHz -2dbfs 40mW FFT 32ohm load
24b/48kHz 12kHz -2dbfs FFT no load
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 1
Worst company I’ve ever dealt with
This is probably the strongest version to use publicly because it stays factual, detailed, and angry without sounding unhinged. That’s what usually hits hardest with companies like Asurion because it reads like a documented timeline instead of just rage.
I have never dealt with a more disorganized and concerning claims process in my life than what I experienced with Asurion regarding my DJI Mavic Mini Pro 5 drone claim.
This entire nightmare started before the claim was even filed. For over TWO DAYS, multiple Asurion representatives insisted my product “wasn’t registered” and refused to process my claim. Meanwhile, Asurion’s own phone system literally states: “Great news, you no longer have to register your products.” Their own employees did not understand how their own system worked. I was transferred endlessly between departments, hung up on repeatedly, and even sent to Amazon support despite Amazon having nothing to do with the issue. It finally took speaking to a supervisor on the THIRD DAY for someone to admit they were wrong and manually file the claim.
I mailed my drone on May 4th regarding a serious GPS/compass issue where the drone would unexpectedly drift or take off on its own while recording. Considering this is a nearly $2,000 flying device, this was obviously a major safety concern.
Then things somehow got worse.
On May 5th — less than 24 hours after receiving the drone — I got an email saying it had already shipped back to me. No repair details. No explanation. Nothing.
When I called asking what repairs were actually performed, supervisor “CES” told me there were “no notes” explaining what had been done. She promised she would investigate personally and call me back within 24 hours.
She never called back.
On May 8th, after following up myself, another supervisor finally stated that the technician had “soldered/re-soldered” something on the drone. No explanation of WHAT was soldered. No detailed repair notes. No documentation. Nothing.
This is a drone that had ZERO physical damage and had NEVER been crashed.
I asked for written documentation of the repairs and was refused. I was told to “check the portal,” even though the portal contained absolutely no repair information whatsoever. Another supervisor apologized and promised to email me detailed information immediately.
That never happened either.
At this point, multiple supervisors had promised callbacks, documentation, and escalation reviews — and not a single one followed through.
The drone arrived back while I was still on the phone with Asurion. I powered it on and immediately received compass calibration errors. The drone would not properly calibrate.
So after all this, the drone STILL had issues.
Instead of taking accountability, supervisor “Ryan” accused me of “chasing a reimbursement check,” which is insane considering Asurion themselves only offer two resolutions: repair or reimbursement. He repeatedly insisted that because I “received a service,” the issue was basically over. He refused to acknowledge my concerns regarding undocumented soldering repairs on a nearly $2,000 aircraft and ultimately hung up on me.
Since then, the situation has only become more absurd.
Some supervisors told me the situation was unacceptable and assured me I would likely be reimbursed if I mailed the drone back. Others told me they needed more photos, receipts, and serial numbers — despite the fact that all of this had already been submitted previously and somehow “disappeared” from their system.
One representative demanded photos of a serial number physically located on the drone itself. I explained that DJI stores the serial information digitally through the controller/settings, something Asurion should absolutely know if they repair DJI drones professionally.
That representative then refused to help me further and hung up.
Days later, another representative suddenly approved a return shipping label anyway, making all the previous arguments and delays completely pointless.
Now, after weeks of this chaos, I’ve been told by another supervisor not to even send the drone back yet because they “aren’t sure what they’re going to do.” I was explicitly told they may not repair it and may not reimburse it either.
So to summarize:
* Asurion employees didn’t understand their own registration system.
* I was repeatedly hung up on and transferred around.
* Multiple supervisors promised callbacks and never followed through.
* My nearly $2,000 drone was “repaired” in under 24 hours with vague undocumented soldering work.
* Nobody can tell me exactly what was repaired.
* The drone still had calibration issues immediately after return.
* Supervisors contradicted each other constantly.
* Previously submitted documents mysteriously disappeared.
* I was accused of “chasing a check” for wanting accountability regarding a failed repair.
* I still don’t know whether they plan to repair, reimburse, or do nothing.
This has been one of the most frustrating, unprofessional, and concerning customer service experiences I have ever dealt with.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 13, 2026
★★★★★ 5
Excellent Support
Very easy to contact a real person and get solutions extremely quickly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
★★★★★ 1
Do not buy this protection plan!
Warning! The details of this Warranty are misleading and make you feel like they will pretty much replace anything. I am trying to have stained discolored cushions replaced on lounge chairs, less than six months old. Talking to a customer service representative is out of the question. They ask a few multiple-choice questions and base your claim on that. My claim was denied and that is the end of it. I have spent $80.99 on two different asurion protection plans need and now I feel like I have wasted $162.00. I'm not happy and will never buy this protection plan again. Now I have to find and purchase new cushions for replacement.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
★★★★★ 4
Great chair
You sit on it more than in it. It's a bit firmer than my old one, but hopefully it will soften up as the years pass. Otherwise, great chair, easy to put together. The theater lights are a very cool touch at night.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2025
★★★★★ 5
Worth It!!
Easy process and prompt action taken
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 19, 2024
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