Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good sound , easy to install, wrong mechanical info

Tried to install on my dry wall ceiling (7cm from a concrete ceiling) and discovered that the speaker depth is not like published online (nor in the documentation that came with the product).Finally after a failure to carve in the concrete ceiling, I used a with sponge to extract the speaker 12mm from the ceiling.Other than that surprise, the installation when OK and the sound is great (for surround speaker)The price is fare.All in all this product is positioned well on the value/cost axis.