John, other than the use of FeSi-1002 compund on the Hydra 8, I have
not read of filtering increasing through the Hydra product line either on
the Power Snakes website or in reviews, although I have read Clement
Perry's Stereo Times review in which he expresses his subjective opinion
that the Hydra 8 sounds better in some respects than the lower models.
Then, later in the review, he writes of the wonders of using two Hydra 2
conditioners together. That's safe reviewing, wouldn't you say? I believe
the rest is marketing strategy.
Why would anyone pay a premium to buy an 8 outlet power conditioner
for digital sources, which would at most utilize only 2 outlets? Doesn't
that seem wasteful? I'm also dubious of the real world effects of current
limiting unless one is using two enormous 600 wpc power hungry amps
at the first two outlets. This
Shunyata web page talks
specifically of the non current limiting aspect of Hydra conditioners. Are
the marketing folks at Shunyata blowing smoke? After all, the
recommended configuration per Shunyata is to plug the amp into the
duplex closest to the IEC, followed by the preamp and finally the source
components. The reason being that amps require the most juice, and
source equipment requires substantially less juice, hence the rationale
for plugging the least power hungry components into the duplex
farthest down the chain. Unless one were to inexplicably plug an amp
into the duplex farthest from the IEC, I cannot fathom current limiting
being an issue.
As you might expect, I'm not of the opinion that two, three, or four
power conditioners are necessary. I believe that idea is solely born of
marketing and misinformation.
To answer your question, I have not tried more than one Hydra...or more
than one of any power conditioner I've owned, and if I were to do so, I'd
certainly try two Hydra 2 or two Hydra 4 conditioners first. If you are
inclined to try multiple conditioners, I hope you do so with an objective
ear, and please report back.