Last week I came to the isolator, I have not yet been able to test it with lipo batteries, but with linear pOwer supply. I do not know if this will change anything my first impressions. I have declared myself as Allo fan, very fan of Cali, Boss and Piano 2.1, go this ahead. Just as I have no interest in favor, I do not have it against either.
I have not yet been able to test it with lipo batteries because the battery pack was defective and burned, but I do not think it is much better than my good line feed.
My team consists of active speakers studio monitors Neumann kh120A, with flat response so they are very revealing, my listening in the near field and I have acoustic treatments that give a great scene and detail.
I tested Isolator with Boss, and the Raspberry Pi powered with my linear power and battery. With Boss I have not noticed a big difference neither for nor against, but I think with isolator loses some of that musical “magic” that has Boss. The sound is a little cleaner, but I doubt that with other less revealing equipment you notice no difference.
With Piano 2.1 and Cali in dual mono mode there is more difference. The sound is cleaner with isolator, with less grain, that makes the sound a little sharper, it is possible to be more realistic, but I prefer with more grain because it sounds more analog and with more presence.
In the end everything is a matter of personal tastes. Isolator is not going to give more detail or more bass range, or more scene. It only provides a slightly different sound track, especially with Cali and Piano 2.1. If you buy isolator with battery pack plus 4 rechargeable lipo batteries and your charger is an investment of $180, totally unjustified for what you get in return.
When I receive the replacement from Allo of the defective battery pack I will extend this opinion in case of battery-powered power supply other than linear power. I hope this opinion is helpful to you. And remember, it’s only my opinion.