Plugging DDJ-T1 to a single monitor (TRS output)

Hello,

I own a Mackie MR8 MK2 ( http://www.thomann.de/fr/mackie_mr8_mkii.htm) and I am trying to connect it to the DDJ-T1's TRS output. I am not sure which kind of cable I need to do that. The DDJ-T1 have 2 TRS outputs (Left/Right) while the monitor only have 1 TRS input. 

Do I need a simple TRS-TRS cable which I connect from the monitor to either the L or R output of the DDJ-T1 but then I only get L or R?

Or is there such a cable that plugs to both L and R of the DDJ-T1 and to the monitor input that kind of convert the stereo output so I don't lose anything?

I own this cable ( http://www.thomann.de/fr/the_sssnake_sk3154_insertkabel.htm) which I thought would do the trick but apparently that's not what it's used for. Using this cable I get sound but no lows and ni highs, only mediums.

I don't know much about cables, any help and links to cables is greatly appreciated.

Thanks in advance