F3 still is a decent filter, but I don't think it's the best tradeoff in a practical audio application. As this technology and the advantages it has, is super popular for the moment, I am sure we will see many more 1-Bit and R2R dongles in the near future.

The xDuoo XD-05 BAL is a brilliant DAC/AMP, taking advantage of all the features introduced in previous generations: versatile design, complete I/O, excellent sound. This enables the device to transmit audio over Bluetooth without tampering with audio quality in any way. Also, I expect that I would be using this 99% of the time as a desktop dac/amp, and not a portable, so unless there is a way to bypass or limit the battery charging, it would sit at a 100% state of charge almost all of the time, thereby degrading the battery over time, even if the battery is not used (LiPO batteries "age" fastest at 100%, and a 50% charge is best to preserve the life of a battery). The last few weeks my wife hasn’t always been happy with me though, “You’ve been spending way to much time in your office” is what she says.The new FiiO E10K TC is a nice release from FiiO as it shows they’re still believing their legendary product in terms of performance.

Due to changes in the circuitry the DX3 Pro+ offers 60% lower THD+N when it comes to DAC and 85% lower THD+N in HPA. Frankly, I think that a company that produces such successful products should have aesthetic concerns. As usual, Topping shows that it uses proper measurements and engineering talent to design its products. If you’re after more details, resolution, and better presentation technical-wise, I’d suggest trying the DX3 Pro+. The own two products on this list, the Audioquest Dragonfly Red, and the Pro-Jet Pre Box S2 Digital.channel powered speakers, or if I'm feeling too lazy to get up and walk three steps to the album library to grab a CD and instead want to stream lossless files from my cell phone (my phone is Sony and supports all the latest codecs, including LDAC). I’m sure all the journeyman headphone addicts know what you are saying but this new guy sure didn’t! I was thinking that even without the deep science atm - the bottom line of how it affects sound is known to knowledgeable people like yourself - so at least with a simplified explanation I'll pick correctly until the extremely detailed info follows. It is the perceived sound quality that matters not the measured quality – unless that measurement has been scaled and correlated to subjective perception through valid psychoacoustic tests. I just impress by beats solo hd for its portable use (direct ipod / blackbery), bass impact, and good isolation.