DIY Filter for Flush Mounting Freestanding Speakers

Consider what would happen if your amp fails and you have to tear it all apart....I pulled my amps when I soffit mounted for that very real possibility...I've also had an amp fail on a Dynaudio BM12a in the past, so its something to consider...

:thu:

Is there anyway that I can get more detail into actually mounting/framing up for the flush mount? I thought you had to use like 4 different material and really build out each frame inside of a frame. So Do you have a diagram as to what components are required

There is no one way to do it. Basically, build a super super strong frame. Either rigidly mount your speaker, or float it. Make sure there is ventilation up the back side of your speaker. Use the top and bottom of the soffit for bass trapping (hangers are great as they rule acoustically, plus allow air flow for your ventilation). Look up the soffit baffle rules on some threads on the forum. Use the lower part of the soffit for absorption as you will probably get some reflections off the back of your desk/furniture that this will help with. The baffle cannot touch your speaker. The face of your speaker needs to be flush with the baffle. The baffle must be insanely rigid (think of like... a thick sheet of MDF, sheet of steel, then a thick plywood veneered sheet for your finishing layer. Having said that, your speaker has to poke through all of that. So, that's why something like a steel plate is great as it adds the strength and mass without being 2" thick! Greg

curere wrote:

Thank you for that... Is there anyway that I can get more detail into actually mounting/framing up for the flush mount? I thought you had to use like 4 different material and really build out each frame inside of a frame. So Do you have a diagram as to what components are required

As Greg said, there are several ways of designing a soffit: it all depends on how much effort you are prepared to put into it, and how accurate you want the room to be. In all cases, though, you do need a very rigid, solid structure (framing) inside the soffit, to hold it all together. Then there are basically two options for the actual speaker mount: have the speaker tightly encased in a solid, rigid enclosure box that is rigidly mounted to the the frame, or have the speaker decoupled from the frame with a different type of enclosure box, so that the speaker "floats" on carefully tuned isolation mounts, and therefore cannot transmit any vibrations into the frame. I prefer the second method, but it is more complex. There's no need for different materials: It can help, yes, but isn't necessary. The real goal is that the front baffle must be very massive (dense), and very rigid. Take a look around the forum, especially the studios with soffits that are currently under construction, so you can get more ideas about how to do it right. - Stuart -