XLR one male to two female in stereo, is this possible?

I've just bought a Mission Gemini 2 stereo powered cab, to use with my FX-3.
It has only one input, a combination XLR/jack.
The manual says to use a jack splitter trs to two mono left and right from the FX-3.
When i use that jack splitter cable, something very bad happens to the sound - it gets very nasal.
When i connect a normal XLR cable from left output on the FX-3 to the Gemini, the sound is fine.
Does anyone know, if a XLR splitter cable can be wired in stereo, with two females from left/right on the FX-3, so it comes in to the Gemini in stereo from the male stereo input.
Thanks.
 
The manual says:

Input 1 – The combo connector supports XLR, 1⁄4” TS or 1⁄4” TRS jacks. Use a 1⁄4” TRS cable to connect the output from a line level device such as a modeling amp, preamp, or multi effects device to Input 1. The right channel is on the tip and the left channel is on the ring. If your input device outputs left and right signals on separate jacks, you will need a TRS insert cable to connect the two output jacks to the single TRS input jack on the GM-2.
Use an XLR or TS cable to connect a mono signal to Input 1. When using a mono input, use the stereo/mono toggle switch to control how the signal is routed to the drivers. In stereo mode, the signal will use one of the internal drivers. In mono mode, the mono signal will be bridged to the two sets of speaker drivers.
Is there a reason you don't want to use the recommended cable? Output 1 has jacks for both XLR and 1/4"... But you could probably use one of these:

Amazon product ASIN B07HF7FB5R
 
Thanks for your reply Unix.
Like i wrote, i have tried a split cable with two ts jacks to fx-3 out, and trs to the input of the cab, but the sound was terrible, very nasal.
So i have actually done, what they suggest in the manual.
Do you know, if replacing the two ts jacks with xlr in the fx3 outputs, will make any difference, so that i won't get the same ugly sound as i got with the jacks.
 
I would suggest you contact Mission Engineering.

I'm not sure a TRS "splitter" cable is the same as a TRS "insert" cable.
 
I would double check the Y adapter like unix-guy said. A stereo splitter is typically used to allow two sets of headphones to plug into one jack. The two end jacks share the same contacts (TRS to dual TRS). You want an insert cable that separates the tip from the ring to two separate mono jacks (TRS to dual TS). On an insert adapter, the mono ends are usually labeled left and right or tip and ring or are color coded.
 
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