Picture of Ceiling speakers mounted into faux speaker boxes.
The idea here is to use a high grade ceiling speaker, purchased at a discount price off of an auction site, re-package it for surround sound duty. Here I used an EV C8.2. These go retail for about 350$ a pair. I have bought them on Ebay for as little as 20$ used. The EV (Electro-Voice) C8.2 is a solid, well built speaker. It has a 8 inch mid with a 1 inch titanium tweeter, it puts out a full sound with sparkling detail. But, it is made for recessed placement in a ceiling.

Most surround speakers are small, tinny devices. And over-priced. Sure, you can buy great speakers but hey , it's your money. My route is to re-purpose these for surround sound, aimed forward, not down, fill the room with sound.

Step 1: Build the boxes

Picture of Build the boxes
The steps to build the faux speaker box are pretty straight forward.

My first plan was to build a six sided box. Fully enclosing the speaker. But this ended up being a huge 16x13 box, way to big to mount on a wall or put on a shelf. This led to the idea of a Hungarian slot shelf type thing. The speakers are kind of angled into the corner at 45* and I only have to cover up the speaker to mate it to the wall.

First build a box. I used  3/4 inch MDF. Screwed together and with wood glue too. Next , I found some Honduran Mahogany veneer sheets. I used contact cement brushed on the MDF and the veneer. Wait 20 minutes then press them together.

This is certainly practical.  Ceiling speakers can make rather effective surrounds.  If you had them around, and did the above, I applaud you.

However, these speakers are designed for being mounted in a ceiling (ie, in an infinite baffle) configuration, not in a box. As such, they may not sound as they are supposed to. If the engineers that designed those speakers saw this, they might face-palm.  Why not just get a full-range driver that's supposed to be mounted in a box by design?

That said, if it works for you, do it.  :)
eu4euh (author)  sheepsimulator5 years ago
I don't think you have seen these speakers first hand. The EV 8.2c's are a closed system speaker, the part of the unit that extends into the ceiling is a metal box. The only port is on the front speaker side, a small bass reflex hole and the speaker is filled with BAF. I don't think the speaker is a infinite baffle type. These speakers are good enough to be aimed forward as well as downward from a ceiling. The EV 8.2c has a 8" mid and a 1" titanium tweeter, so it kind of qualifies as a full range speaker. My home theater employs a SVS cylinder sub-woofer for the low end.

When I saw this speaker first hand, I came to the conclusion it is a metal speaker box that happens to be designed to fit in a ceiling hole for aiming down. I am just aiming it forward into the room, making its appearance better and making it fit efficiently better into a corner space. Also, this approach is acceptable to someone who doesn't want to or can't  cut two ,one foot holes in a ceiling.

Did you see the speakers on the last page? These box speakers together are truly great sounding, Also, the frugality of the project paid off. I picked up one pair for 40$ on Ebay.   

Trust me , the set up works very well for surround sound or stereo music listening.

After examining the slides more closely, your'e probably right.  Didn't know you put that much design thought into the speaker, it isn't terribly clear from the instructions.  Most of the DIY speaker Instructables on this site consist of "I put a speaker in a box and it roxors soxors!" with very little thought put into the design.  I only ran into one that tried applying traditional box speaker design theory. 

I'm glad you took box-design (or the fact that it was done for you :) ) into account.