Nice frequency response, if relatively flat (+/- 10%) however, my room configuration demands 9' cable, absolute minimum. I don't like extension cables. They tend to pull apart or add more problems, in my experience. K.I.S.S.. You'd wonder how I accomplish anything under these space constraints. lol
Thanks for jumping in though.
Don
PS: Those that don't give a freq response, I dismiss out of hand.
Don, don't worry about extension cables. I have using this technique for years now:
1-loosely put a zip tie (#1) around the headphone cable
2-loosely put a zip tie (#2) around the extension cable
3-loosely put a zip tie (#3) into the zip ties #1 & #2 loops
4-securly tighten zip ties #1 & #2 onto the cables
5- tighten zip tie #3
I know that you will have to have someone do this for you but your cables will not come unplugged if someone trips on them.
I hope this helps good buddy.