Qudelix-5K Bluetooth USB DAC AMP with LDAC, aptX Adaptive, aptX HD, AAC (Dual ES9219 3.5mm Unbalanced & 2.5mm Balanced Output)

Love the sound quality and compactness. Now that they have added a 20 filter PEQ, it's even better return for money.

Up to expectations. The hinge broke in a month despite the fact that I hardly used it for 4-5 days during that period.

Not to be used as primary usb dac

Sound quality is batter than fiio btr5 Best EQ options Much Power Best for portable use It can power high impedance headphones

Believe the hype - the Qudelix 5K is such an advancement over other pocket DAC amps that it’s ridiculous. The star is the app, which allows for detailed sound customisation. You can use parametric EQ or a ten-band graphic equaliser. You can choose from hundreds of preloaded PEQ presets that cover just about every headphone and earphone in existence, and edit and tweak them if you like. That lets you get the sound tailored to your preferences, no matter how much of an audio nerd you are. Power-wise, the 240mW on balanced (2.5mm) output is good enough to drive 300ohm-100dB headphones, like the HD650 adequately, with some headroom left to spare. On the single-ended 3.5mm output, you need to crank both device and Q5K volume up to near maximum for the same kind of results. On more sensitive, low-impedance devices, like the Blon BL-03, for instance, you need to dial the volume way back. I listen with about 25dB of headroom for those (on balanced output, with about 5dB of headroom on the phone volume). The app has too many functions to list, but they’re all laid out intuitively, and reward experimentation. Plus, Qudelix updates the app and firmware regularly and takes user suggestions on board for new features. The option to have the device charge only up to 80% (thus extending the life span of the battery) is an example of the latter. Other good features include: -- The ability to have the device power on or off depending on what it’s connected to. -- The ability to draw power from USB selectively - you can disable charging when it’s connected to a phone, for instance, so it does not drain the phone’s battery. -- Super-fine-grained volume control. -- EQ settings are saved to the amp, so you don't lose them when switching devices. Battery life is decent - but not stellar if you're going to be using it in balanced mode all the time. The button placement and design on the Q5K is perhaps the only flaw on an tremendously well-crafted, well thought-out product that punches well above its category.

Bought my unit directly from the company in South Korea. Amazon as ususal is overpricing it. I got it for 15k after shipping and import duties. Have been using the Qudelix for my cycling rides for 4 months now. I can vouch that they are really well built. They can take the sweat, rough and tumble well. You can see the small scuffs on the clipp in my photos. I think their use of materials are spot on. I saw some reviewer saying that the clip broke, maybe he tried something odd with it. My unit have been thrown off my pocket during ride. And it is absolutely the most well built unit in this category. I had used a Btr3k earlier and I know what I am talking about. The company keep upgrading the internal firmware every month. The app is absolutely solid now. No crashes on the phone. So that department is covered. The company is very committed to this product and they are from South Korea. They have a lot of new features added like a digital crossover etc added in this time. In my opinion this is gold standard for what a bluetooth dac can do! Also they can work like a usb dac 96k max using a usb C cable. You have 2 in the box. You can use this as a desktop dac amp if you are on a budget. These can easily drive a large range of headphones and almost all iem's. I use the onboard digital dsp equalizer when I switch between my Blon BL03's (iem) or the HE4XX (desktop rig) or the IBasso Sr2's(desktop rig). I can say with certainity that this portable unit fairs quite well on the audio quality scale against my Desktop rig (Custom Allo Revolution Dac, Toppng D10s, IFFI zen dac and dedicated headphone amp Topping A50s). Yes you are not going to the get the dedicated amp level gain of volume. But what you get is usable and wont make you deaf. The sound stage is wide enough, and on tonality and details this little dac/amp holds on it own. I also use the Balanced output to drive the harder headphones. They have excellent power (2v single ended/4v rms balanced)and sound is absolute quality. It is great value for money! The cons, it is clunky to use. Because the button are opposing when you grasp it and press one side, the other button gets a phantom input. Especially when you are doing sports and outdoor activities. You have to develop muscle memory for control. It they upgrade the firmware for the new Lossless high bitrade Aptx codec it will be absolute bargain. May be they cannot - the bit rate is max 990 and the codec need 1000, maybe licencing and hardware limitations? Are you listening Qudelix?

I used the QUDELIX 5K for a few months, sold it to switch to similar Bluetooth devices only to buy it again. The 5K is superior, and here is why: • Exceptional proprietary app, with instantaneous response time, undoubtedly the best on the market. Extensive EQ capabilities and customisation, making the devise a miniaturised professional amp. • Elegant and discrete design, with customisable light so you don’t feel festively decorated all year round. • Despite the minute design, the 5K has great control buttons, easy to locate and operate. • Truly integrated clip, which does not add bulk to the slick design. • Discrete battery life, 8hrs. • The crisp and balanced sound of the ES9219C DAC chipset. • Seamless automatic switching from Bluetooth amp to Dongle amp function (many other similar DAC amps require manual switching). • Finally, size and weight. This is the smallest and lightest Bluetooth DAC amp available. Mine is paired with IE200s and, clipped to the original Sennheiser cable, or 2.5 balanced cables by OpenHearth wrapped around the neck, is virtually impossible to feel. Obviously, a personal consideration but, based on my experience, the QUDELIX 5K is unrivalled in the space of ultraportable DAC AMPs.

The price-to-performance ratio is insane. I have several other products to compare with, such as the Chord Mojo 2, Chord Hugo 2, Audioquest Dragonfly Cobalt, Red, and more. The Qudelix 5K doesn’t quite keep up with Chord’s products, but then again, they’re not even in the same price league… That said, it’s clearly better than most of the gear I test it against. The versatility and sound quality are superb!!! I primarily use it as a headphone amp/DAC for the PS5, connected via the PS5’s front USB-C port. The headphones I most often use for gaming are the Sennheiser HD560S, and they sound really good together. I’ve also tried connecting it through the USB-C port on my iPad. Works flawlessly and even drives my Sennheiser HD600 impressively. This is through the unbalanced 3.5 mm output… I haven’t tried the balanced 2.5 mm output yet, but that would be really interesting.

This is my first DAC/amp. I bought it mostly based on the hype and positive reviews, and because I wanted something portable with a lot of flexibility. Overall this is an excellent DAC/amp for the price with a really strong feature set. Bluetooth supports most of the important codecs, and the balanced 2.5mm output is a big plus for something this small. In 2025 I do kind of wish it used 4.4mm instead, but it’s not a deal breaker. Sound quality is clean and has more than enough power for the headphones and IEMs I’ve tried. It also has battery passthrough and lets you set safe charging limits, which is a nice touch if you care about battery longevity. The app is one of the best parts. There are a ton of options, it’s actively updated, and it feels like the developers actually care about supporting the product. Build quality seems fine for daily use, but it’s basically a chunk of plastic with a clip, nothing fancy. The buttons take some getting used to, and there’s a lot I still haven’t messed with yet. This probably isn’t the device for someone who just wants super simple plug-and-play. But if you want flexibility and control in a small portable DAC/amp, it’s hard to beat for the price.

Deze bluetooth DAC overtreft mijn verwachtingen: heel detailrijke klank, mooie textuur en timbre. Ik gebruik hem voornamelijk met een Queen Of Audio Vesper IEM en een Sennheiser/Drop HD58X hoofdtelefoon. Voor geen van beiden heb ik EQ nodig met de DAC. Zelfs een 30 jaar oude Sennheiser HD480 II klinkt, met slechts een beetje lift in de lage tonen, beter dan ooit tevoren. Het belangrijkste verkoopsargument van de DAC is de EQ, maar die is voor mij minder belangrijk, de instellingen in de app zijn zeker zo interessant. Er zijn enorm veel mogelijkheden. Een raad voor nieuwe gebruikers: doorloop aandachtig alle instellingen. Zoniet zal je enkele cruciale functies over het hoofd zien, zoals de 2 volumeregelingen in cascade. Uiteraard zijn er beperkingen: een hoog-ohmige hoofdtelefoon zoals de Sennheiser HD250II (300 ohm) is weliswaar nog net aanstuurbaar, maar daarvoor is de DAC niet gemaakt en dan moet hij echt "zwoegen". De bediening is een beetje wennen omdat de knoppen geen labels hebben, maar daar is een oplossing voor: de Qudelix 5K sticker by Sproketz.

The Qudelix - 5K is really a wonderful small HIFI component, which I have now been using for one year. Its extremely compact and light weight, so one can easily clip it to a pair of open back headphones, the range of codecs supported and the stability of the connection are excellent, the companion app offers many settings and customization option, the EQ tool is great and easy to use, one can also use it as a desk dac/amp while preventing the (over)charging of the battery, etc, etc... Everything that Qudelix and other reviewers say about that product and its qualities and functions is true. Honestly, I can't think of anything negative to say about it. The best audio equipment purchase I have made in years !