soundcard specs

It's ridiculously difficult to find actual specs for soundcards!
Most "spec sheets" seem more like sales pitches, listing the hot
features but vague as to quantitative specifics.

Anyway, I am looking for the following data on Turtle Beach Santa
Cruz soundcard:
**Input impedance
**Input voltage range

These don't seem unreasonably complex requests but so far Turtle
Beach tech support has been completely unhelpful and just spouts back
the specs that are already prominently listed on their webpage.

Could anyone point me to somewhere else that I might find this kind
of information??
thanks!!
kp

--- In metatuning@y..., "X. J. Scott" <xjscott@e...> wrote:
>
> Most likely the input range is expected to be -5 - +5 volts,
> with some variation possible to the extent that
> consumer/non-pro soundcards do not promise to be well
> calibrated.

I thought typical soundcard range was more in the neighborhood of
2Vpp but not sure how consistent different manufacturers are.

>
> What are you trying to interface it to?

A Shure mic mixer. Long story. If you're interested in continuing
the conversation you can email me off-list, but I think my question
has been answered to the extent that it can be.

Thanks Jeff!
kp