xbox brick is a switching supply.
I kind of knew the battery pack would end up winning, just didn't know by how much margin; but I was also expecting the transformer box to do better than it actually did. Maybe the xbox brick's extra power (12A rated, driving a 0.5A load) did help the brick to sound better, or maybe the transformer box just didn't have quite enough extra reserve, it might take at least 20x capacity to make an non-regulated supply sing.
I think a good linear regulated supply will be close to the battery pack. My sigma-22 is in pieces (in the process of a re-casing) so I can not do a comparison right now. I don't know how "super" a linear supply has to be to show the benefits, though. I am sure a Sigma-22 will provide good sound, don't know if the other stuff, such as the $100 teralab supply, can do as well.
But if it is only to run a E90, for the $100 it might be better to do a battery box: get some AA Eneloops, put into a box with a charger, add a switch to select between two banks (so there is always one set of fresh batteries available, as long as the charger is plugged in)
https://www.amazon.com/Panasonic-BK...hild=1&keywords=eneloop&qid=1613938469&sr=8-5
https://www.amazon.com/Tenergy-RC-A...eywords=nimh+charger+rc&qid=1613938594&sr=8-8
then again, the sonic differences were clearly audible when using the test rig, but will it be worth the trouble to do a battery box for a stock E90..... maybe not. I did try a battery pack with the stock E90 when I first got the 95x, and the stock sound lacks emotion even with the battery pack.
I kind of knew the battery pack would end up winning, just didn't know by how much margin; but I was also expecting the transformer box to do better than it actually did. Maybe the xbox brick's extra power (12A rated, driving a 0.5A load) did help the brick to sound better, or maybe the transformer box just didn't have quite enough extra reserve, it might take at least 20x capacity to make an non-regulated supply sing.
I think a good linear regulated supply will be close to the battery pack. My sigma-22 is in pieces (in the process of a re-casing) so I can not do a comparison right now. I don't know how "super" a linear supply has to be to show the benefits, though. I am sure a Sigma-22 will provide good sound, don't know if the other stuff, such as the $100 teralab supply, can do as well.
But if it is only to run a E90, for the $100 it might be better to do a battery box: get some AA Eneloops, put into a box with a charger, add a switch to select between two banks (so there is always one set of fresh batteries available, as long as the charger is plugged in)
https://www.amazon.com/Panasonic-BK...hild=1&keywords=eneloop&qid=1613938469&sr=8-5
https://www.amazon.com/Tenergy-RC-A...eywords=nimh+charger+rc&qid=1613938594&sr=8-8
then again, the sonic differences were clearly audible when using the test rig, but will it be worth the trouble to do a battery box for a stock E90..... maybe not. I did try a battery pack with the stock E90 when I first got the 95x, and the stock sound lacks emotion even with the battery pack.
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