![]() The woofer is mounted near the bottom of the OB. A rubber gasket is used to make up the required thickness so the removable full range driver is flush with the main baffle. The removable baffles are the metric equivalent of 1/2" thick. Each full range driver is pre mounted in a painted 8" x 8" removable baffle with a short piece of speaker wire that can be quickly attached to the barrier strip mounted just below the opening. For this application, four toggle bolts allow rapid assembly and removal of the baffle. The removable baffle is held in place with four long toggle bolts, Toggle bolts are typically used for attaching objects to dry wall where some added strength is required. A strip approximately 1.5" wide and 1/8" think was glued around the perimeter to prevent the plywood laminations from showing along the edges of the finished OB.Ī close up showing the back of the full range driver's removable baffle is included below. The plywood used was the metric equivalent of 3/4", by adding bracing the total thickness approached 1.5". You can see the bracing arrangement used to reinforce the baffle, attach the removable full range driver's baffle, attach the feet, and provide a method for mounting the terminals for the two pairs of speaker cables required for a bi-amped configuration. The back of the OB design is shown in the picture below. When building the speaker I cut enough of these removable baffles to try five different pairs of full range drivers, good enough to get me started experimenting. In the picture above you can see an 8" x 8" removable black baffle a close up view is shown below. Recognizing that I wanted to try a variety of full range drivers, each requiring a different diameter cut-out and pattern of mounting screws, I devised an easily removable baffle arrangement. Digging through my collection, I found enough scrap pieces to build this 20" wide by 38" tall OB speaker system. Over the years, I have accumulated a nice stash of veneered plywood in various sizes and thicknesses. The lure of an inexpensive two way OB design with enough flexibility to not lock me into a single driver combination convinced me to finally build this experimental OB system late last summer. In reality the choice of full range driver could also include many 6" and even 8" models. Since I am already using an active crossover system with two SS amps, the choice for the full range driver opens up to just about any available 3" or 4" model. Project 9 : Eminence Alpha 15A Experimental Open Baffle Design Eminence Alpha 15A Experimental Open Baffle DesignĮver since I wrote my article "Designing a Passive Two Way Open Baffle Speaker System" the idea of combining an Eminence Alpha 15A woofer with a smaller full range driver has been something I have wanted to try. ![]()
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