As I'm an idiot I pasted this in the wrong chat. This is one way to cut a sheet of plywood down from 1440 x 660 for pieces for the 8" Basschat speaker. There are others but this does it in six cuts if you can stack the pieces, click on it to expand.
If you have your own guide rail BUT it's not 1.3m long, you can also use cut 3 first, then cut 4, place them on top of each other to do cut 1. Still the same number of cuts. Apparently my circular saw will do 66mm of cuts with the blade at 90 degrees. It's a relatively cheap Makita (for Makita) https://amzn.eu/d/j6vA5Sf My guide is only 1m long so I do the same cut pattern as @tauzero. Your local timber merchant may have their own way to cut this. my local one has a sign adjacent to the very large table saw, saying this is highly dangerous equipment and under no circumstances tell the operator how to do his job
So 24mm of plywood should be no problem and neither should 36mm of plywood (mmmmm...). It has an 80 tooth wheel on so it does very nice fine cuts and I have absolutely no idea if that makes a difference or not on the depth. If anybody can say for certain it's OK to cut 36mm of plywood without it destroying the 80T blade or motor?
I'll have try when the weather gets better. Currently we appear to be doing our best to emulate Noah's flood in North Yorkshire. One day of decent weather and two weeks of rain and another week forecast. My poor dog never seems to have enough time to get dry from each walk