[NOTE: this is a compilation of various direct quotes from the Roc product page, archived here]
Real balance HP Amp/Preamp
ROC sound as "A wire with gain".
Usually, in our products, if I use ACSS technology, I will design the sound signature as neutral.
Neutral in my mind, is neutral and faithful-like, Roc doesn't have any particular character, like our other ACSS products, its sound depends on the source, Roc reveals to you the merits or shortcomings of your source. It only drives the headphone, without coloration. I think, use of the word "neutral and faithful" will be better than the use of "neutral".
Applies all audiophile grade components, including DALE resistors, WIMA & EVOX caps (German brand), custom order NOVER (UK brand) caps, all audiophile grade input & output sockets
Roc has ample inputs and outputs, and includes one RCA inputs, one XLR inputs, and one ACSS input.
When fed with an RCA signal, Roc can change the RCA signal to an exact XLR signal at first, then change to a current signal to feed to ACSS modules. Roc has gain balance control between RCA and XLR, so output level of RCA input is the same as XLR input.
When fed with an XLR signal, Roc can re-proofread the XLR to make a complete mirror (exact) XLR signal, then change to current signal to feed to ACSS modules. In cases where the source output XLR signal is not exact, (Hot signal level not same with cool signal level's absolute value) through this re-proofread process, it can correct the signal to produce an exact XLR signal.
In short, whatever the input might be, Roc will output XLR signal to Headphones, unless your headphone is plugged into the single-ended output sockets.
Roc has one 4 pins xlr, one set of 3 pins xlr, and one SE socket as output.
What is Roc:
1, Roc is base on Phoenix's design, it is a true balanced design, signal circuits and chassis box style the same as Phoenix.
2, Roc applies 4 floors ALPS volume pots, and applies class A PSU.
3, Roc has gain balance control between RCA and XLR, so between RCA input and XLR input, there is the same output level .
[Floodo1 edit] My Roc (balaned version = not the SA version) has a stepped attenuator (I believe this is the "23 steps Exponential" volume control that is listed in the Specs section). It turns out that the Roc and the Roc SA are surprisingly different. The Roc has a stepped attenuator instead of a volume pot, and it also has also has ACSS (balanced, "classic" connector (bayonet style)) input in the place that the Roc SA has a second RCA input. Both are balanced amps throughout (accept balanced input on XLR, have parallel channels, 4 pin/wire output for separate +/- for left and right ears) though!