mwillems
Thanks. Any suggestion how to implement my two simple adjustments then? I am sure it is dead easy but it would require me probably to read loads an loads of websites to figure it out myself. Any help would be appreciated!
GermaninLondon
You'll want to pick the center frequency for the shelves based on the halfway point between the two endpoints.
For the high frequency shelf, you'll want a center frequency of 7500Hz, a "gain" of -1dB and a Q of .25 or .3
For the low frequency shelf it's more complciated as JRiver doesn't support a shelf with a Q higher than 1, so you can't just dial in one shelf. So your choices are to either dial in a parametric instead (which as HiltonK notes, may be safer for your speakers and easier on your amps) or dial in several 1 Q shelves on top of each other. For example, I can get close to your desired response with four low shelves all centered at 85Hz, all with a Q of 1, but with gains of 1dB each.