Bought two additional receivers with two IEM sets.
They work without issues, we do use different frequencies for mic and stringed instruments, besides that the mixers router operates at 5Ghz.
Only thing I don’t feel comfertable with are the included unprotected batteries, Li-ion batteries used for bodypacks should always be those that have a protected circuit, just as radios, phones, e-cigs and other devices carried close to a persons body.
As I mentioned i the review for the IEM system, the stage manager I work with each summer has seen quite a few bodypacks go into flames, which cones down to device circuit and battery safety, which also included replacement of batteries where the wrap is broken.
So Thomann take note and be so kind to improve it.
And others that use these sytems, be sure to read up on these type of batteries, I mean, even charging them it is adviced at a fireproof place or to use a special bag.
Transport of them should also be done by having them in cases made for it so that there is no risk for shorting them out.
In worst case scenario they can explode.
Enough ramble, minus 1 star for the included batteries, can be improved upon.