Based on resistor values and compared to Ric's design schematic values these appear to be the low impedance version.
EVS design schematic:
http://www.tweakaudio.com/Attenuator%20info.htmlthe first three resistors are colored...
1: brown, red, brown, silver (1.2)
2: red, brown, brown, silver (2.21)
3: orange, white, red, silver (3.92)
I used this resource to determine resistor values based on above color combination
http://www.elexp.com/t_resist.htmAs FYI, I was using them on Bel Canto eVo 200.2 in bridge mode fed by a Sony 777es SACD player into Maggie IIIA's before i completely revamped my system to an all balanced Ayre setup (K5XeMP, V5Xe, QB9).
what cables were you considering?