Failure to install a back box for your in ceiling speakers will dilute the sound quality and lead to noise pollution in other areas of your home.
Do in ceiling speakers need a box.
Typically the manufacturer not the dealer will recommend one option or the other depending on your unique setup.
The main thing to consider is how many channels you will have and how many speakers would be optimal for the space you are hoping to fill with audio.
You will need a little knowledge about the ceiling space wiring and pipes and you will also need to check with building inspectors regarding fire safety risks in some states.
No ceiling speakers are usually passive speakers which mean they do not have built in amplifiers and instead receive their power via speaker cable that is run from an external amplifier.
Do ceiling speakers need mains power.
This is achieved by wiring each ceiling speaker up to the binding posts on the amp.
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With a backbox you protect the investment of built in speakers and keep sound localized.
In fact in many cases the backbox was the difference between a sound investment and a wasted one.
Most work very well without a back box but some require one or alternatively some kind of compartmenting in the wall or ceiling around it.
A back box is usually a flimsy plastic box that fits behind the speaker in the wall or ceiling.
It usually is not very rigid has no acoustical material inside of it and it hasn t been designed with the proper internal volume needed for best bass performance with no adherence to the theile small parameters of loudspeaker design.
It serves a soundproofing function improves audio and protects your speakers.
Any time you put a speaker in your wall or ceiling you should use a backbox.