A few Fosi Audio products do not have linear outputs, so you may want to check yours maybe, if you care about this. I know for certain the K5 Pro had a dip in bass not correctable with the bass control.

Ok, I don't know what to tell you, buy something else then. But, the smaller capacity the battery has the more fragile it is. In the absence of a protection feature/circuit, it's just chemistry.

Don't keep it plugged in all the time, don't store it at 100% charge, don't discharge it all the down to 0 and the battery will last a very long time. LiPo batteries like to be kept between 20 and 80% charge for optimal lifetime, I follow these rules myself and have zero problems with the ton of...

It's kind of the same thing here in Australia too, can't return headphones/IEMs generally due to hygiene but depends on the store mostly, Amazon will take almost anything back. The MK3 even though it has a big shell is pretty damn comfy IMO, for example the Kiwi Ears Cadenza which is a lot...

Stop feeding the trolls, if you mention them they come back.

True. I have the Hiby R3 II for comparison, which is probably the closest to the BTR7 and yeah, except the clunky Bluetooth operation it's not too bad.

I agree about power not being significantly higher, it is higher though if someone cares enough I guess. Also, the BTR7 doesn't have any hiss even with super sensitive IEMs, to my ears at least, so it's pretty good in this regard. Purely from a sound perspective I do like the BTR7 slightly...

If you want to stretch it out a bit maybe the BTR7. Just kidding, no, it's not even close in terms of software. It's much better than when it launched but it still only supports 3 profiles (at least then can be renamed now) and the interface is crap compared to the 5k. It sounds freaking great...

Geez dude lighten up a bit, you act like your life depends on the 5k. It's OK, it's a fine device and you'll love it. See above my friend, come down on the ground, go outside and touch some grass, I understand you probably debated a long time on what to get and now some dude on the forums...

Compared to you, I use my own ears to make a judgement. And I don't think I failed to follow etiquette, I am talking from my own experience, not parroting reviewers. I truly believe I am a step ahead of you as I actually own the devices I talk about. I'm sorry I hurt your feelings, not my...

No it's not, it's you who are biased cause you do not have points of comparison. I do have them and I can talk from my own experience, I do not have to rely on reviews.

I own the BTR7 (and the Go Blue and way more dac-amps) and the 5k is nothing special in terms of sound, it in the bottom drawer. If it wasn't for the software no one would be talking about it.

Probably. But no one buys the Qudelix for the sound, they buy it for the software. The sound itself is fine, it's decent, , it sounds like a $100 device, I think my BTR7 and other DAC-amps I own sound better for example.

The explanation is that: fast filters add echo. slow filters sound natural.

You surely must have this the other way around lol