ntp 179-500 limiter - pinout and schematic ?

[stratosphunk]

Hi ,
here I got a pair of ntp 179-500 limiters. Does anybody have detailed pinout and some information about this modules ??
I already have them racked and they are working- but the output seem to have a deemphasis on both modules with a drop of 10 dB at 10kHz.
I suspect that several settings could be made at the rear connector, via ground to some pins.
So any information about this is highly appreciated. The limiters were introduced after the 179- 400. They are having two outputs and the transient limiting function.

I already got in touch with dk audio and ntp, they both seem to have no manuals...
Thank you all
andy

 

[Aleguitarpro]

I was searching for same docs.
I haven't any schematic or pinout and I've 2 of this modules bought years ago.
Same problem here: I have roll off on output.
I see 179-570 has a switch to disable this but I'd like to take a look at a schematic to understand how.
Thanks