No one actually knows how to lculate what speaker cable they need

What gauge is your poweramps secondary windings? This size defines how much power your amp will be able to push out. Forget about the amps max wattt rating, it is the amps dynamic capasity that defines the need of wiregauge.

Mine has 2x9awg windings pr side so I`m running 7awg solid to the woofers

Mr.  khiak
Could you please provide me the serial numbers of your  Goldmund Telos 600 amplifiers?
Mr. Rodolphe from Goldmund Swiss asked me about it.
I'm waiting for his replay, but the S/N may help.
Thanks
It is a mystery that this second Swiss firm, with extremely high end products, dosn't provide the data on their DFs.

Hi b4icu,
sorry for the late reply as I was not home. I have 5 Telos 600. 4 fo

The SN is at the bottom of the amp, so I managed to have 2 SN. Do you need the SN on all the amps.
1) 80719382
2) 80518968
many thanks for your help.

Mr.  khiak
Thanks. The data was passed to Mr. Rodolphe at Goldmund.
I assume that they will replay tomorrow or Mon. 
Its is 6 pm now in Swiss, 7pm here in Israel.
Sorry for the delay...