I merely want to state my experience that cleaner power improves the playback of the Bardo which the OP is interested in.
My Bardo and Sp10mk2 both benefit from cleaner power. THe SP10mk2 even more so. This experience is different from " The Bardo, like all direct-drive turntables, must include its own outboard power supply which needs to be linked to the motor speed via a servo, in order to stablize the drive. In this case, additional AC treatments preceding the motor supply module are unnecessary if not even a bad thing".
My Bardo has the upgraded power supply and the Technics SP10mk2 is from Artisan Fidelity with new caps and more. Both hold speed without and with the power conditioner. In the case of Brinkmann, there are power supply options with both their DDs and BDs which change the sound significantly. Maybe your sp10mk3 has a better designed power supply that takes this out of the equation.
I am in the suburbs not very far from power line with a dedicated subpanels and lines installed by AV solutions. The AC off the wall rages from 119V to 121V. Crude THD measurements is 4%. Unplugged from the wall, the regenerate AC is 120V with 0.8-0.9 THD.
The improvement I hear seems to be more than just speed stability. I suspect that it is related to less vibration of the motor. The noise floor drop away with softer notes played softer and overall increased in dynamic range and more focus. The gains on belt drive are less.
