The Tyros itself weighs 12.4 kg, the sub woofer weighs approximately 8kg and the satellite speakers around 0.7kg each. I am not sure about the weight or dim's of the L7S stand. Keyboard dimensions without music rest etc are 1140 x 428 x 137mm. The subwoofer is 350 x 210 x 321 mm whilst the satellite speakers are 97 x 159 x 178 mm. All these sizes and weights are as given by yamaha, not actually measured.
The subwoofer sits on the floor, it doesnt mechanically attach to anything. The satellite speakers attach to small brackets which screw onto the rear of the Tyros with 2 screws each. You would need a screwdriver and a few minutes to attach them (though the brackets could be left screwed to the Tyros and the speakers removed simply by releasing their catches)
There is no specific case to carry the speaker system that I know of, but you could get one either made by a custom flight case company. Or.. just use the original box!
You would need first to see if the volume level is sufficient for your needs from the Tyros TRS-MS01 package.
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Simon G.K. Williams
simon@svpworld.com
Creative Music & Multimedia
http://www.svpworld.com________________________