I liked the concept of the Khan, with its dedicated low end driver and its tame manners in the higher frequency. I really was looking forward to there arrival from Linsoul. As for technicalities, they are pretty much alike from soundstage presentation to resolution capabilities. So no contest on these both devices unless I insert the "Hi-Res" variant of the EDA which is pointless.

The IEMs also have some marble design with the logo of Hawaiian Bad Boy on the right earphone and QKZ’s branding on the left, both in gold finishes. Build Quality

Enhanced high-intensity magnetic circuit greatly improves bass performance. With HBB’s special tuning, the earphone reproduces crystal clear sounds with enough bass for people who want to crank it out a bit, yet still be able to hear every instrument and vocal details of what is playing through their headphones. It is a good choice for R&B, DJ, stage performance, metal... When comparing these earphones to the KZ ZSN, I found the vocals to be more pleasing, with rolled-off treble peaks that lend themselves well to extended listening sessions and podcasts. Although the KZ ZSN has excellent sound separation and layering, the QKZ handles bass better, providing a more inviting and enjoyable listening experience.

Calla's high frequency range is not as extended as that of QKZ x HBB, so it is not a perfect top competitor, but it is generally superior in terms of low frequency depth and overall original sound fidelity. In addition, the ear hooks that came with the cable were loose and quite uncomfortable but it wasn’t a big deal for me as I could easily swap them out with a better one. Sound Quality The earphone is characterized by a unique logo that is reflective of HBB’s Hawaiian roots-a combination of audio and design. This design has been etched directly into an CNC processed Aluminum faceplate that now matches the clear resin shell." ReadZero’s tone and timbre make this budget earphone stand out in the crowded budget space. The naturalness and tonal accuracy found here are rare for something in this price range. QKZ x HBB Sound

I have zero issues driving this set. Even from an iPad 2018 I hear decent dynamics. The Zooaux Dongle Dac paired well with Xhbb which tells me similar small dongles will work perfectly fine. I also really enjoyed this set attached to the Fiio Utws5. What a nice pairing for a Bluetooth tws type option. The AK dac within seems to reach a nice synergy with this budget gem. More Power This is not indeed a clean bass response as there are some obvious bass bleeds that smear on the midrange that gives a more warmer sound and at the same time a sense of bloatedness.Detachable cables allow you to swap out different kinds of cables. These can feature materials that make a difference to the sound signature or different termination types like 2.5mm or 4.4mm, which are sometimes needed to plug into various devices. The HBB commemorative coin is quite the item. Such extras also enhance the guarantee of authenticity, being that bootleggers would be incredibly troubled to manufacture a coin. Such exists the coin as simply another clue as to how freaking over-the-top this release is. The coin comes in its own plastic case and weights a staggering 34 grams and is emblazoned with the HBB symbol on one side and the QKZ symbol on the other. Also around the parameter is HBB Audio on one side and QKZ audio on the other. Enhanced high-intensity magnetic circuit greatly improves bass performance. With HBB’s special tuning, the earphone reproduces crystal clear sounds with enough bass for people who want to crank it out a bit, yet still be able to hear every instrument and vocal details of what is playing through their headphones. It is a good choice for R&B, DJ, stage performance, metal…

treble positioning definitely behind that bass but in terms of extension and texture it is good indeed Titanium-Coated Diaphragm​With times of experiments, QKZ acoustic engineers eliminated ordinary diaphragms and eventually selected the unique 10mm Titanium-Coated Diaphragm to deliver a detailed, accurate sound that is different from any other product in the market.Resolution is more focused on macro-dynamics rather on micro-detail retrieval on how it portrays it overall definition. But micro-details retrieval of this set is somehow decent but not the best out there. Timbre is more on a warmer side of tuning. Wireless Earbuds are no doubt convenient. But they usually sound pretty ordinary. These IEMs, although wired, are designed and built with the goal of just delivering brilliant sound. The build is very well put together and without any glue spots or rough surfaces or slight misalignment. This set seems to be built pretty well and actually looks pricier than it is. Otherwise, the sound department is very good. If you're thinking about getting these, you should definitely do so, but be aware of the minor discomfort. All of the other IEMs I mentioned are more comfortable..