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I agree, finally hearing one in action and experiencing whatever positive things, and whatever issues might present, will be the bottom line... But I would not just pick one thinking they are all the same, or without researching how rating requirements might be different for our quiet audio use compared to for camping or backup uses.
Quality of output depends on so many things... does it have enough power headroom for a setting... is the output pure and unpolluted... if so, how long will the particular unit's battery last per session within a particular use the system requires... and how does this average into the number of charges before needing battery replacement, etc. Then, if whatever is chosen is on some technical borderline depending on environment and use, like lots of conditioners, it could possibly work for one and not another. And finally, like everything else, expectations of the user and things like how refined and dynamic the power supply is, might make it fine for one, and not for another.
Many of us have used a lot of different power "fixers," and all I have tried have their pluses and minuses stock. And our individual power problems are always variable. So in part, variability in success with so many of these things makes sense technically.... different power issues, along with different gear and system needs will change the outcome, aside from tastes and expectations being variable.
Like Triplite Isolation Transformers... some think they are great, and others, not so... Or I finally got a used PSAudio P5 regenerator with so many swearing by them, and I thought it needed some notable tuning and attention to fit my needs for transparency and speed in my setting. And with it, and much more attention between wall and system, I still struggle with challenging hum levels, at times, and for my tastes, when everything is cranked up. Many serious audio heads will avoid any conditioning if conditions permit with a clean dedicated line. And much more....
So it seems to me this is likely like everything else.... the success of the unit chosen is in part based on the particular environment, the particular system, and tastes... and likely all of these based on my experience.
Anyway, just pointing to research if one wants to test one of these as it is likely that some will be better for audio than others relative to transparency and dynamics. And, if they are an overall improvement, then we would find out if it works well in battery mode, and perhaps less well in plugged in mode, the charger likely influencing the power cleanliness, but how much??? And if so, what about battery longevity in use, and in terms of the max number of charge cycles... costs of replacement batteries... does the unit itself make any noise you can hear in the room... lots of considerations.
I don't know, not having tried one. I do have a recent "sine wave" UPS for other use that is supposed to be purer than most grid power, and maybe it is in some ways, but I have my doubts about audio. For one thing, with it, you can hear an audible noise in the unit itself beyond the fan that starts when it cuts into battery mode. Just the unit noise and fan noise would irritate me for audio use, and I suspect both might pollute the output as well, at least some. So another consideration, even if the wave created is pretty clean, then is all the rest of it isolated and not polluting the power-out (or audible space) with noise that our sensitive-to-noise Decware and ears will reveal.
I think another part of my suspicions are that historically sine versus modified sine has not been cut and dried. There are very likely still degrees between the two in terms of purity and sound based on tech used to create the AC from DC, and as pointed to, other influences to consider for audio... Also they advertised the inverters I used back in the day similarly, "better than most grid supplies..." This little thing is basically a little battery power station advertised for backup and camping, etc, and it may or may not address noise in ways we would like for day in and day out fine audio. Or if they do address noise more carefully, some units from the same company might be more focussed on being cleaner beyond sheer functionality, with attention to powering more sensitive needs better... attention to lower distortions/EMI/RFI, and clean power/parts/design for mitigating noise and not limiting dynamics.
Just considering how difficult it can be to solve noise from the grid or otherwise for sensitive audio gear... this depends on a lot of things. I mean, just think about how much energy gear makers spend on a clean power supply in our fine audio pieces...things dedicated to low noise and complex dynamics. And think about how many people end up with hum issues even with all this work, as well as with a lot of care in power conditioning or regenerating work.
So if some of these really can give clean dynamic power, that could be really nice!
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