This question is often asked in various forums. Sadly, there's hardly any post out there describing the whole thing.
To be honest, in-wall and ceiling speaker installation during the time of construction is literally the easiest way to install speakers and with a little bit of cleverness, anybody can do it.
In order to install ceiling speakers in new construction, you gotta proceed step by step.
1. Collect All the Things First
First things first. Now to start working, you're obviously gonna need the speaker first. After purchasing the speaker, you have to collect other materials and tools that will be required for this installation.
Mount plates and screws for external mounting, measuring tap, utility knife, scissor, plier and cable cutter for trimming, splitting and cutting, zip ties and straps for binding, stud finder for locating studs, drill, hammer and nail for pinning, beating and bending, and connectors.
For wiring, you have to buy either CL2 or CL3 wires. Because these are the only cables that abide by the building codes. Buy a certain amount of gauge that'll be needed at the time of wiring.
Since you're purchasing a ceiling speaker, it's obvious that it'll have a mounting kit. However, that kit is not enough for the whole setup. You'll need some additional brackets and ceiling mounting plate. Collect wall-mounting plate too.
2. Plan a Design
Never go for such action without a proper plan, specially when it's a new construction.
Our advice is, even if you're confident about your skill, conduct your contractor or hire a system designer. Due to their long-time experience in the job, they'll instantly know what to do when and what should be done at a certain emergency.
With their help, plan the whole thing and make a design of the whole route. Select the place where you want to install the ceiling speaker. Mark that place. Then select the route for running speaker wire.
Make a complete design and also have plan for emergencies, because you don't know when you're gonna need it. So it's better to plan it in an earlier basis.
3. Check the State
After you've made the plan, it's time to check the whole route.
Why? To make sure it's in a good condition for speaker installations. Since you'll be working in a new construction, this step will be a lot easier for you.
If it were an old house, checking would be difficult since everything would be shifted already. But now, since the work is yet to be completed, you have full liberty to do enough investigation checking all the things thoroughly.
Now go and check. See if there's a water pipe or any electric line on the way. If there is a line/pipe, you better move aside and choose another path. We have to make sure that our cable isn't interrupting any other connection.
Take the stud finder and locate studs on the way. Either you gotta plan a way avoiding those studs or drill through them if possible to make way for the wire.
4. Clean the Route
After confirming that there's no possible obstacle that can cause problem to wiring, take the necessary tools and start cleaning the route to make a way.
And in case, if you find a stud or any other obstacle, try to uproot it. If that's not possible, make sure that they can be drilled (I mean, make sure that they're safe to drill) and start drilling holes afterword for work convenience.
5. Make a Path
Something needs to be done before running wires. In short, you gotta make an easy path for the speaker installation.
After cleaning obstacles and drilling through the studs, start working on making a way for the cable.
This task is gonna be pretty easy for you, since it's a new construction. Cut a drywall. Drywall is needed for wire routing. The studs are already drilled, so there's no need to worry about it anymore. Start drilling holes on other objects.
Prepare the mounting plate and drill two holes in it, for running cable and speaker connection. Also make similar hole on the ceiling. For wiring through walls, repeat this again with walls and wall-mounting plate.
6. Start Wiring
Now take the straps, zip ties, pin and start wiring. Take them along the targeted route and secure properly.
7. Nail the Final Pin
By saying that, I don't mean to nail any pin literally. I'm talking about completing the work.
After finishing wiring, bring them out through the holes and secure the holes with nailing the mounting plates. Install receptacles, controls and the bracket for mounting. Also use the kit that comes along.
8. Hide the Parts That You Don't Want To Be Visible
Since the cable has been run through the walls. But many parts are still visible. Hide them by painting and using boards/plaster over.