Burson it's using cooling fans and pretty significant heat sink solutions, specially on their newest amp, the voyager, and also cost thousands of dollars, so I expect them to work without a single hitch or problem at that price point. Also the Violectric HPV222 it's like the closer competitor to the S17 and it's MSRP it's about $1,300 usd, sometimes you can find it cheaper on Drop.com, but still more expensive than the S17 even with the better pricing.Addressing your three comments in order:
1. That's not what you originally said...you said "I find that the Mojo 2 works better between 2 and 3 V. Above 3V it starts clipping"
Now you are happily quoting that it clips above 4.3V?
I'm pleased to see you've realised you were incorrect.
2. According to this review by Soundnews, the amp uses Class-A/B for the 50mA mode - but if that isn't the case, I stand corrected.
Again, @AuneAudio can you please clarify whether the S17 Pro uses Class-A/B mode for 50mA?
3. I've never said the TA-22 gives you 100mA/ch. Nor do I care about its operating temperature. What I have said is that is in many cases (judging by this forum), the S17 Pro states it does offer 100mA/ch, but clearly cannot do that consistently, without modifications at the owners' expense.
Nowhere does Aune state that you must use a particular type of headphone cable or a cool room otherwise you can't consistently use the 100mA mode.
As a further example, the Violectric and Burson make amps that can use Class-A mode continuously, without overheating and having to adjust their operating mode. They don't need platforms, feet or fans.
I'm glad that you're happy with the amp and your platform and your fan and I'm glad that you think it is worth the effort. That's great.
Personally I would like an amp that uses Class-A consistently, without me having to make modifications.
I do hope that's all clearer now and I look forward to @AuneAudio clarifying the two questions I asked them.
Yep, Aune could had done a lot more things to make this amp better, most of this would have meant increasing the price of this amp significantly, Is this a perfect product?, nope, do you have to do somethings in order to run this amp at 100ma, high gain constantly that are kind of cumbersome and annoying? yes. Is it the end of the world? far from it. Like I've seen plenty of people using fans to help cool Schiit's MJ3 and people are not complaining that much about that amp and also there has been problems with switches, volume pots going bad and now swollen caps that are failing on this amp and even tho this amp is almost twice as expensive as the S17, people just accept it that they have had to send now multiple times there MJ3 for repairs just because of brand's name, which is well deserved, when in comparison I personally have seen a lot less significant issues with the S17 in comparison. It personally annoys me a lot that we're willing to call this amp "bad" when other companies can get away with the same or even worse just because people are really biased in this hobby.