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Hey there people! So I've been fascinated by the whole idea of Synergy type speakers. Read a lot on DIYAudio forum and even tried to build a few using off the shelf horns. They sounded OK, but i still had that bug inside that made me want more. Then I stumbled upon ChrisA's thread on a synergy type speaker based on K-402 horn. Gone through the whole thread and through many more others, read up benefits of full horn loaded systems, modulation distortion, constant directivity and all that jazz and that made me crave a pair of K-402-MEHs even more. Buying a set of horns was out of my budget, so i started exercising an idea of building the whole system from scratch. I found a thread on an Australian forum, where a guy made a pair of K-402 replicas out of wood and XPS foam. The guy had already made huge part of the job on estimating the size of the horn, expansion rate, where it starts to curve and the curves themselves. So i opened SketchUp and started playing with the model based on images of his horn. After i was satisfied with the model of the horn, I began working on other parts - the box, placement of HF driver and woofers, small parts that help hold the whole thing together. This is how the model looked first: But i knew that i am not an engineer or an experienced woodworker and since i was not going to (or was capable of) assemble the whole thing by myself, i was in need of a help of a professional who would work on the model and made sure that all the elements fit together nicely, that the parts could be machined on a CNC and prepare the drawings necessary for production. Here are some shots of how the model looked after the guy i hired modified it: In the end I had drawings and STL files so those could be used while CNCing the parts. Now all major parts are ready and guys from local woodworking shop are assembling those: I will be using Faital HF204 for HF duties and Beyma SM-115N for LF. Bought them already. As for the amp, i will use an old AV receiver. Beymas are 8Ohm but i will connect them in parallel, so there is enough power in the receiver to drive them. And i will probably not need deafening sound pressure levels. Will consider swapping the receiver for something of higher quality if i am not satisfied. I have a room that is relatively big - 12X6 meters which is about ~40X20Ft. Speakers will be in the corners. If i am not satisfied with LF performance i will build a couple of tapped horns (have a few ideas on those). I want to thank ChrisA for all the help he provided via private messaging and patience to my questions. Without him I would never come up with an idea of building this speaker in the first place and without his help i would build some garbage So i hope this project turns out well. Can't wait to bring those monsters in my house and start the tuning process. -------------------------------- While the project is still in the building stage, I decided to share 3D files i used with the community. Hope this is helpful and somebody will duplicate the whole project or some parts of it. Most of the info is in Russian, but the text isn't really necessary for understanding which parts goes where. This is not a complete clone of Chris's MEH or K-402 clone. This is as close as i could get with the information i had. Files are available at this link.
I'll start by copying my thread from another that started this discussion: and some follow-up posts: Looking forward (i.e., not really backward), some of these technologies have already been introduced into the consumer marketplace, as mentioned above. Chris