Originally Posted by Erich H
I could really use some help deciding on this speaker layout.
Update on the SEOS 3 way design with a prototype photo.
I decided that it made the most sense to start with the first one in that picture for a couple reasons. Using a single 12" woofer will keep the whole speaker at 8 ohms. The cost of the speaker would also be less. The height of the waveguide is about perfect (I made it slightly taller). A single woofer in the enclosure will allow it to run without a subwoofer for music. I will look into using 2 woofers, but that model would likely be tuned higher and would need a subwoofer. The good news with duals is that the lower woofer chamber would not change size over the single full range model.
Basically, this would be the Maximus-12: Very powerful woofer, oversized midrange with a SEOS waveguide one size bigger than the mid.
Because this is the Maximus that uses the higher end parts, I thought it would be fun to make the prototypes baffle just as nice. I had some bamboo left over and figured why not. Keep in mind that the midrange shown is NOT the one that will be used, I just happened to have that one sitting around from earlier in the year.
When I drew out this enclosure at only 12" deep and 44" tall there wasn't much room around the midrange chamber after its depth and the internal bracing. Very little volume was left for the woofer to actually use. So I changed the idea a little bit and made the woofer into it's own box. This has some benefits that could help out later. Easier to move, easier to ship. Easy to change to dual woofers with just a different baffle. The midrange and waveguide can be toed easily without actually needing to move the woofer as much. The same woofer and enclosure could be used in a cheaper design......by only changing out the top portion of the speaker. The same woofer and enclosure could be used as a midbass module, or a stand for other small speakers. After weighing all those options, I decided to just make it 2 enclosures. It could be made back into a single one quite easy.
I'm also not 100% sure about the ports just yet. I use those so the designer can easily take them out and adjust the length to tweak the final tuning if needed. I really love the way this is turning out.
So here's what it could look like:
I should have taken a better side view photo, but forgot.
My prototype just uses some regular birch plywood.