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What you lose is

the current limit and thermal shutdown capabilities of the TPS regulators (see data sheet). It is really not safe in the long term to connect an unprotected high current supply like so. You should also try it with and without trickle charging as this can simply mean paralleling a quiet dc supply with a noisy one. And if you have a very good 3.3V charging source, you may not need a battery.

As I have already posted, there are other, even easier ways of improving SQ, and I have done it with battery plus dc power into the Regen, coupled with other PC tweaks. However, as stated, I shall compare the direct battery power mode with 3.3V superregulator power and other methods.

What is clear is that, by tweaking the Regen, one can get much better sound than from other competing devices like passive filters and straight forward usb hubs like the Wyrd.

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