Average comfort with subpar bass, sound, and features
buy from amazonI have had the pleasure of testing various headphones over the last few years. I have grown to enjoy reviewing the packaging, perusing the features, testing the comfort and fit, and feeling the quality of bass, blend, and staging. I have played with various EQ modes (built-in and app-supported), used active and passive noise cancellation at various levels, and used transparency modes, bass boost, music, voice, gaming, and sound modes. Before any of the bells and whistles can be considered, the product must be comfortable to wear and have sufficient battery life. Always on the search for the perfect pair of headphones, I had high hopes for the MIXX StreamQ C4. Unfortunately, the reality did not live up to the hype.
Packaging:
I truly enjoy the packaging, unboxing, and presentation of a new product. The color choices, layout, font, and message can all add to or detract from the device. The MIXX Stream Q C4 arrived in an attractive desert-tan-colored retail package. The cover listed the product name, a video-linked QR code, and information about active noise cancellation at the top of the panel. The lower edge listed four product features (soft memory foam ear pads, hands-free calls, rich/immersive/enhanced sound, up to 40 hours of playtime), a Bluetooth logo, and a golden, metallic ANC (active noise canceling logo). The main focus of the cover was the large, slightly raised, glossy image of the headphones. I was able to see the black earcups, padded headrest, 3.5mm port, USB-C input port, and buttons. I enjoyed the cover’s layout, the silver MIXX name and lower product icons upon the tan background, and the golden accents of the ANC logo, and the sine wave music feature overlaying the headphones.
The left side panel listed five product features (up to 40 hours playback, transparency mode, 3 preset EQ music/bass boost/voice, integrated controls, foldable design), and a few icons denoting the goals to maintain appropriate eco status. The bottom panel listed the product barcode, numerous manufacturing labels and address/contact information. The right side panel listed the MIXX name at the top, a product contents list at the bottom (headphones, USB-A to USB-C cable, 3.5mm cable), and a large clear plastic window of the side of the headphones. Although I typically like open window systems, the view was not particularly flattering. There was a layer of dust or a greyish powder covering the internal window, giving it a muffled appearance. I would have preferred the front panel to open, revealing either a folded pair of earphones or a fully open pair in all their glory.
The rear panel turned out to be my favorite. I liked the three lifelike images at the top of the panel, the demonstration of both male/female models, and contrasting imaging of the deployed and folded appearance. Beneath the images, you will find a labeled image of the MIXX StreamQ C4 headphones. The bright white panel provided a sexy backdrop for the contrasting font and the picture of the black, raised, semi-glossy StreamQ C4 headphones. The panel detailed the ANC, comfortable/adjustable headband, contoured touch controls, ANC on/off button, USB-C charge port, soft memory foam ear pads, foldable design, 15-minute quick charge=8 hours playback, and an accessory 3.5mm audio cable. I liked that they used the white background as an accent to the surrounding tan panels. As noted,, it provided a vibrant visual panel to describe the product features. I appreciated the images, the lack of redundancy, and the overall layout.
If you are someone who likes to save boxes, I warn you, this may not be a package that you get to save. Normally, you can remove a pull tab or slice a piece of tape to remove one of the flaps of a box. This setup lacked an easy-access system. I had to rip the lower panel away from the box to access the product. I was able to prevent damage to all of the other sides except the bottom. I removed the internal tan-colored cardboard box from the outer shell and found that the headphones were 3/4 inside the box and 1/4 outside the box. I set aside the remaining cardboard and reviewed the components: a short 10 1/4-inch-long USB-A to USB-C cable, a 48 1/2-inch long 3.5 to 3.5mm cable with mute button, a 7-inch-wide by 8 1/8-inch-tall nylon carry bag, a multilingual instruction manual, and 8.1-ounce headphones.
Instructions:
I plugged a Klein Tools Multimeter into a USB-A port on my UGREEN 160W USB-Hub, the USB-A cable into the multimeter, and then the USB-C prong into the USB-C port on the base of the right earcup (5.11V/0.40A). A red LED illuminated adjacent to the charging port once power was added. As the device charged, I perused the instruction manual (English, French, Spanish). The cover featured an attractive female in the moment of music appreciation. The light blue color added a warm,fea inviting feel, and provided a nice backdrop for the image and words. I opened the book and found a book-within-a-book setup. The first page flap opened to a welcome panel and then further opened to reveal a labeled diagram of the MIXX headphones and a panel thanking the user for their purchase. When you turn the table of contents page, and with the front flap opened, you will notice that the design allowed for three panels to be viewed at once. The diagram labels corresponded to the segments/descriptors within the manual.
The manual detailed a vocal two-minute play time warning, LED indicator, how to connect to power, and reviewed the LED color. I found an error in the manual on page 1: it stated that the LED would glow white while charging and extinguish when fully charged. However, in reality, the LED glowed red while charging. The subsequent panels detailed how to power on the headphones with the Multifunction button, a welcoming voice prompt (Power on, Pairing), a red/blue flashing LED to signify pairing status, how to connect to your Bluetooth device, and a 15-minute auto-off feature. If you do not have a Bluetooth signal (airplane/crowded space/low lower) or wish to use the device in wired mode, you will find a helpful section on “LET’S GO WIRED.”
The subsequent panel detailed the button combination/utility of the headphones. If you single-press the MFB button on the base of the right earcup, you can play/pause music or make/end a call. A short press of the contoured, rounded, volume up/volume down buttons will increase or decrease the volume, while a press-hold of the volume up/volume down buttons will change tracks. The ANC button is located on the side of the right earcup. You can short-press the button to cycle through Transparency mode, ANC ON, ANC off modes, and a voice prompt/white LED will alert the user to the mode/status. If you triple-press the main power button, you can cycle through the included three EQ settings: Bass Boost, voice mode, and music mode. While some may feel this is a pro, while others feel it is a con, there is no EQ app and no way to customize the EQ settings. The final few pages of the manual described the padded headrest, adjustable/extendable headband, foldable design, a request to recycle the packaging, and then safety features.
Shape/fit:
The 8.1-ounce headphones could be divided into dual earcups, a bending/folding swivel segment, and a headband. Each earcup measured 3 1/4 inches wide by 3 1/2 inches tall by 2 inches thick and had a 1-inch-thick foam pad. You can orient the Left to Right side by aligning the L/R printed on the inner felt lining with the correct ear or look for the right earcup buttons/ports (USB-C port, 3.5mm port, action buttons, and ANC cup). Each earcup measured cup was connected to a 3/4-inch-tall by 1-inch-wide swivel, then to a 3-inch-long by 1-inch-wide collar. You can extend the collar headband junction by pulling outward, gaining an additional 1 1/8 inches on each side. The centralized headband segment measured 5 1/2-inches-long by 1-inch wide and had an ~1/2-inches thick foam pad. Even though the pad had a squishy feel, it still felt thinner than other headphones in the same tier.
I placed the earphones over my ears and found that the earcups fit snugly around my ears. I appreciated the cuff thickness and the leathery feel against my ears/neck. I was able to lie in a supine position or on my side with my head on a pillow without experiencing much discomfort. However, I did not like the headband section. It felt hard against the apex of my scalp and did not feel comfortable for prolonged listening. I tried to expand the headphone segment, adjusted the fit against my head, and placed/replaced the headphones several times to try to optimize the fit. After several attempts, I did not mind the earcups but was displeased with the uncomfortable headrest.
Sound:
After about an hour and a half of charging, the LED finally extinguished, and alerted me to the fully charged status. I pressed and held the MFB, noted the flashing Red/Blue LED, navigated to Settings, Bluetooth, and selected MIXX StreamQ C4 from the list on my iPhone 17 Pro Max. A female voice announced, “Power ON, Pairing, Connected.” Once paired, I navigated to the audiocheck.net website and tested the Stream Q C4 headphones with the Low-Frequency Response and Subwoofer Audio Test (10-200 Hz). I tried the test in transparency mode and heard/felt rumbling at about 30Hz. In ANC mode, there was a high-pitched whistling starting at 10Hz and continuing through 40Hz, and then an odd vibration, rattling sound/feel continued. I turned the ANC off, cycled through transparency to ANC on, and still had the whistling/vibration only from the left earcup. In all honesty, it felt like someone put a baseball card in a bike spoke. The right earcup sounded okay, but the left one seemed broken or defective out of the box.
I triple-pressed the MFB button and turned to bass boost. It seemed to make the sound louder but did not provide a deeper feel or an EQ boost. When I turned the ANC mode back on, it created an audible whistle that would not stop. I cycled through the modes again, blew into the microphone with canned air, and then shook the device. It made a whistling/jostling noise like a shake chicken toy. I powered them off, powered them on, cycled through each mode, and found that the left earcup produced poor-quality output and an annoying external auditory whistling. The bass was weak in all modes, the ANC felt more like a passive noise-cancelling and actually muffled the sounds that I heard. I have used the AudioCheck website for years and have never had this experience with any other pair of headphones. I navigated to The Ultimate Bass Test 2025 on YouTube and found the right side sounded fairly good, while the left side whistled. I unpaired the device with my iPhone and paired it with my iPad Pro 13” and repeated the tests with the same result.
For a follow-up test, I used the High-Frequency Response and Hearing Audio Test (22-8 kHz) and found a similar result to the bass tests. The right earcup sounded okay, but the left one was dull, tinny, and poorly balanced. This test, unlike the others, relies a bit more on the user’s hearing. As we get older, our hearing decreases due to age and trauma (sickness, medications, loud noises, injury, etc). Most adults can hear between 14-16kHz, while some children can hear up to ~18kHz. As a mid-40s male with quite a bit of preserved hearing, I can typically hear the buzzing at ~16kHz. Unfortunately, I did not hear sound on the Stream Q C4 until 14kHz. Similarly, my 14-year-old son, who normally hears sounds at ~17- 18 kHz, was able to hear sounds at 15kHz (announcer will vocalize each 1kHz drop starting at 22 kHz).
When I used the Left/Right/Center test to evaluate the channels, I found the left ear had a tinny, ringing feel on all audio. This was markedly worse in ANC mode and transparency modes, but not in ANC off mode. It did not change in Bass Boost, Music, or Voice modes. I was pleased to find that each of the channels was appropriately labeled, but there was still some pressure like feedback from the other earcup. To further demonstrate this, I used the “Real Thing” Stereo Perception and Sound Localization Test for spacing/staging features. This test is one of my kids’ favorites and has become a must-do step for every pair of earphones or headphones I test. When the knocking pattern occurred, there was a vibration/feel from the other earcup that distorted the sense of spatial sound. The feel was okay but lacked punch, like the bass test above.
To evaluate the headphones further, I navigated to Amazon Music, YouTube, and Apple Music and tested the headphones against several of my test tracks. I listened to the clashing/building sounds of The Dark Knight Joker Theme “Why So Serious.” My favorite snippet of this song occurs between the ~3:30-4:00 mark. The sounds build, then fade, and then experience a call-and-response between the left and right. It almost feels like a helicopter, with back-and-forth pressure. Unfortunately, the headphones failed this test. I missed the climactic build, the crash to bass, and the fullness. I repeated tests with ANC on/off, and in Bass Boost and Music modes. Each mode was disappointing for bass depth, overall feel, left-channel ringing, and an odd sensation in the left earcup. Even the right earcup felt muffled and weak. The muffling was worse with ANC active.
I tried to listen to Holly Cole’s “Train Song” and the intro bass line felt hollow. The epic ballad feel of “Far Over The Misty Mountains Cold” from The Hobbit was missing. The low F# growl from Tim Faust felt lifeless in Home Free’s “Ring of Fire.” Overall, I would give the bass a 1-2/10 and would not recommend the headphones. The Bass Boost was a good idea, but it did not provide a benefit. The voice mode may have given a bit of an improvement to my “Codename Freedom” Book 2 on Audible, over music mode, but not enough to warrant switching modes. I wanted to love the setup, but the acoustics and experience felt cold, distant, and lifeless. I had tried to garner some support for blending and upper sounds, but even those felt blurred, tinny, and sharp. I listened to several instrumental pieces from the Far and Away Soundtrack, Holst’s “Suite in Eb,” and then a few excerpts from the Braveheart and Robin Hood: Prince of Thieves soundtracks. When I was done listening to music, I turned to Netflix to watch an Episode of “His and Hers” and then to Prime Video for an episode of “The Mighty Nein.” Unfortunately, my listening experience failed to improve.
Summary:
I know a lot of effort goes into a product’s R&D and ultimate deployment. I am not sure if I got a broken setup or if this was a common theme, but the ANC was abysmal, and the sound output was lackluster. I jumped to Amazon, read several reviews, and ultimately found a few others with similar findings. I liked the layout of the buttons and the promised features, but I found the delivery lacked substance. Interestingly, I found that a double-click of the MFB could activate Siri, which was not mentioned in the manual. The ANC system was unusable and only muffled the sound, not blocking any significant ambient noise. The transient mode was okay, the ANC off mode, with and without Bass boost, was borderline passable, but not for the asking price.
To summarize the overall experience, I would give the headphones a 5/10 for comfort, a 2/10 for sound, a 5/10 for accessories, and a 3/10 for modes/EQ. There is no battery indicator included, no App integration, and the ANC is unusable. I loved the included carry bag, disliked the incredibly short USB-A to USB-C cable, but appreciated the included 3.5mm to 3.5mm cable. There was also no mention of water resistance or sound bleed. I had my son stand at 2 feet from me and listen to the background sound. I played songs at 75% volume with ANC on/off, bass boost on/off, and he was able to identify the songs nearly every time due to the amount of sound seepage. IF you are traveling on a plane or near other people, be careful what you listen to, as others may hear your output.
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