Need a line stage preamp

Al,

the output impedance (single ended) is 75 ohms and the input impedance on my amp is 100k. 
I thought the ratio had to be min 1:10?

@last_lemming

Note that I was referring to the 10K **input impedance** of the Schiit models that were mentioned, and the possible incompatibility that might cause with the output impedances of **source components** (especially tube-based source components), not with your amp.

Regards,
-- Al

I’m a bit confused and maybe just dont understand, can you explain what the 10k input impedance is all about? How it affects things. I would not be using the Freya in passive mode but active.

my source components are a Parasound JC3+ phono (100 ohm output)  pre and an Oppo player.

When it comes to line-level analog interconnections between source components and preamps issues relating to impedance compatibility are no different than when it comes to analog interconnections between preamps and power amps.

To assure impedance compatibility, in both cases the input impedance of the component receiving the signal should be at least 10 times as much as the output impedance of the component providing the signal, at the frequency within the audible range for which that output impedance is highest. In the case of many and probably most tube-based source components as well as many tube-based preamps output impedances are highest in the deep bass region, specifically at 20 Hz. And the output impedance at deep bass frequencies such as that can be much higher than the specified output impedance, which is usually based on a mid-range frequency such as 1 kHz.

Not meeting that criterion doesn’t necessarily mean that there will be a problem; it depends on how the impedances vary as a function of frequency. But meeting that criterion assures that there won’t be an impedance compatibility problem.

Many tube-based source components and tube-based preamps have specified output impedances that are reasonably low, but that can rise to thousands of ohms at 20 Hz. That kind of output impedance would result in significant rolloff and undesirable phase shifts in the deep bass region when driving 10K, regardless of whether the 10K is the input impedance of a preamp (driven by a tube-based source component) or the input impedance of a power amp (driven by a tube-based preamp).

Finally, as far as I can tell from the specs the input impedance of the Freya S is 10K regardless of whether it is used in active or passive mode.

Regards,
-- Al

Edit: I see you’ve added an indication of the source components you are using to your post just above. I would not expect those particular components to have a problem driving 10K.

Yeah if you can stretch a little to $800 this looks like a good candidate. I just recently was introduced to Mapletree Audio so I’m considering one myself...

http://www.mapletreeaudio.com/#Preamplifiers