If you search the HTFR site for Proel cables you'll see they actually have seperate listings for microphone cables, patch cables, etc. I think these ones (linked to above) are more for connecting equipment, active speakers, etc. as it says in the description - "suitable for speaker applications" and are listed as "Active Speaker Cables".
On the link above, click on the multitude of Die-Hard logos on the right hand side. This will take you to results of the entire range. Then click on the tab for Page 3 at the top. You will now see the speaker/microphone/patch cables.