Bought 8 speakers EV112 and 8 supports. Some of them went inside easily, but some we had to take hammer and bang them in with a lot of effort. As we didnt have enought time to send back, we had to force it.
Silver pins to adjust angle - 2 of them broke after 2 times touching, so we used screws at the moment.
Overall constuction is very very unstable and completely not reliable.