Attenuating Preamp Filter Question

[graygem]

In the attenuating preamp circuit below, what is the high pass filter frequency? I know with out the attenuating resistor (R6), it would be 16Hz, but I don't know what the R6 resistor does to it. My thought was, the R5 and R6 are in parallel, in series with R7, making it at 31Hz.
Thank you.

 

[DF96]

Pin 2 is a virtual earth, therefore R6 and R7 are in parallel. Their combination is then in series with R5.

 

[graygem]

Thank you, I see. This would still give me 31Hz, right?

 

[DF96]

5265R and 1uF gives 30.2Hz. I don't know how you got 31Hz.

 

[graygem]

I don't know either Doing it again gave me your 30.2Hz
Thank you