Shunyata Hydra

check out Shunyata dot com for a spec sheet on each model. They look identical, save for the number of ac outlets

I think my response is a little simplistic.
The cabinet is bigger and there is more "magic gook" (the stuff that makes it sound good) inside.
And let's not forget the cryoed premium outlets.

The value of the 4, 6, 8 is that you don't have to purchase more power cords that would be required by 2, 3, 4 Hydra 2s.
As always, tailor your perspective to read:
"I'm not buying equipment, I'm buying GREAT SOUND!".
Makes spending the big-bucks easier...

Thanks guys. I'm quite happy with the Hydra4 except that I might upgrade to the 6 for more input outlets

I dont think you got your question answered did you?

I think the buss bars are of a different material and could result in some minor differences? I could be wrong!

There were NO buss bars in the Hydra-6, irrespective if what Shunyata claimed. It was all point to point wiring. This is a first hand info, since I opened mine.

Did they change the design ?