Is it safe to remove part of a breeze block inner wall...?

Hi I am considering installing in wall speakers and am wondering whether i need to do anything structural the the wall that would require part of some breeze blocks removing.

The speakers require a hole H 10 3/4" W 6 3/4" D 3 1/8" we have standard dot and dab plaster board so after cutting this away i think i will need to cut into and remove about 2 1/5" to 3" of breeze block.

Is it safe to do this without compromisng the intergrty of the wall? If it is and it turns out i need to go deeper what is the maximum safe depth? Thanks for your help on this!

I am looking at doing the same - was even thinking of core drilling the speakers into the breeze block (for TV centre speakers/tweeter/base port) foaming the cavatiy to seal an air tight enclosure between the holes to form a block work speaker box. Probably would not have much bass but supported by front and rear ceiling speakers together with a sub - hopefull would sound ok for dialogue. The centre speaker seems the most important to get in the wall and not a ceiling.

Does any one have any advise on removing section of block work to flush in a proper speaker enclosure?

I have a block inner / cavity and block outer wall which is rendered. Cavity is blow filled

You can take this out without supporting above since the stretcher bond of the block-work will support its self.
Cavity walls are designed for condensation to run down the inside and onto the cavity tray which directs it back out of the wall.
I doubt you would get problems with damp but technically the opening should have some kind of tray above it especially if its a 2 story wall which will increase the likely-hood of condensation.
In any case condensation should be your main consideration.

Ok, I finally did it. Flush mounted a centre speaker behind the TV. I know this is a compromise and will never sound as good behind the TV but it certainly sounds better than the TV's speakers. Mids and highs sound surprisingly good



I formed the 'box' in the cavity by cutting rock wool slab into strips and blocking top, bottom and sides. Caulked round the speakers and found the bass port worked pretty well.

This will be teamed up with decent point-able ceiling speakers and an under floor sub to form a near invisible surround sound system.

Four years to complete a diy job at home. Respect sir, respect.

BTW, I've used wharfdale flat panel picture frame speakers to get the same unobtrusive arrangement. No diy required, which is always a bonus. Lol.