Do parallel power conditioners clean without restriction?

Yes.  In fact a parallel powe r conditioner like those manufactured by Shunyata, Richard Grey, Transparent and Audience (among others) have only the added power cable feeding the power conditioner as a restriction.  The power cleaning circuitry itself does not restrict the AC power at all.

There are, however, little evidence that these parallel devices provide any measurable AC cleaning benefits although many customers find they do add a perceived improvement to the system they are powering.  There is a great deal of debate ton this subject with some who would suggest the added power cable itself may be a major contributor to the change in perceived performance.

A series power conditioner like those from Monster Cable, Panamax, Fuhrman, PS Audio and others have easily measured results in AC power cleaning.  The downside to a series power conditioner is that there will always be some level of restriction to the AC power by the very nature of the series design itself.  Great care and engineering skill must be employed to have minimal dynamic restriction and maximum measured benefit in this type of conditioner.

PS Audio power products have both measurable and published test results showing their performance and demonstrate over 60dB of AC cleaning for passive devices and 80dB for our active regenerators (Power Plants). 

PS series devices, such as ther Quintet, Duet and Quintessence (among others) are engineered with wire gauges heavy enough that they bordering on overkill, coupled with solid copper bus bars etc. in a strong engineering effort to reduce possible dynamic restriction as much as humanely possible while still being extremely effective in reducing AC noise.

Power Plant AC regenerators are both effective as providing improved dynamics over even the wall AC power itself.  This is due to the onboard energy storage capabilities of an active regenerator.

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