Test: iPhone SE and standard Apple headphones. A very pleasant listening experience. The range is NOT great, but 15-20 feet is about the max, even with no walls between the phone and the receiver. Also the volume slider only increases/decreases BEFORE setting it on your phone. . . When the phone is set to the minimum volume the device will only turn up to a certain point, for a louder output you have a volume boost on your phone. After all, the time between volume up/down or forward/backward in a playlist is pretty short. . . Despite the shortcomings: recommended. UPDATE 11/7/18 I still love this thing BUT . . . . this is normal for low complexity music (as well as most modern mainstream stuff). However, at least some high-complexity classical music sometimes causes artifacts. Mozart's piano concertos, accompanied by a full symphony orchestra, lend themselves well to solo parts, but when the full orchestra enters (especially the crescendos), the upper frequencies are lost. shaky. and it's NOT that file (256 kbps AAC encoded in iTunes from CD), it's ok, straight from the iPhone, the uBTR-DAC just can't handle it, the top end breaks BADLY. The same thing happens in Mozart's flute concertos (same file encoding), although there are fewer "incidents", perhaps because the music isn't as "dense" (it's a chamber orchestra accompaniment, not a full symphony orchestra). The problem is not the high notes per se, as solo flute pieces (especially cadences) reach the 3rd octave of the flute and play satisfactorily with no obvious artifacts, leading me again to conclude that it is the signal complexity that is looping through the DAC. I've also thrown in 5th Mahlers, and surprisingly it came without any really noticeable "hits", but with the caveat that most of it is tonally complex, but not necessarily "thick". In most works the instrumental parts are "separate" and not as parallel. The same applies to Dvořák's New World Symphony. So it appears that a certain set of parameters must be met for "decay" to occur, perhaps a certain "density" coupled in some way to a high-frequency signal, and the lack of a clear underlying instrument. 1 point deduction because there are some "defects" for this price. ' aren't a critical factor, but they're not perfect either. UPDATE 7.23.18 The artifacts mentioned above are rare, but seem to occur mainly when there is a very high frequency signal (like a piccolo or a third octave) in front of a fairly complex background. but not always - it seems that a fairly specific set of conditions must be met for this to happen, and something that is probably very rare in pop music - I haven't seen this on any of my tracks - but this element renders inappropriate some listen to classical pieces. . .UPDATE 8.2.18 Baroque Trumpet Music by V. Marsalis also has the artifacts mentioned above (although they are minimal), although the background is rather "sparse". But so far I haven't been able to find them in any popular music.
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