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Quick & Dirty Modular Mains
I've decided to build a pair of old school mains for an upcoming demo in the company's new listening room (more on the latter in a dedicated thread later on). The system must be up and running by the 8:th of May, so this project must indeed be quick (as in "10 days to go"), and dirty (as in "cheap prefab boxes"). In order to save time, I'll run the system 3- or 4-way active, and (if time permits...) tidy up the FR with an inverse filter. I do have all the components, amps and crossovers, as well as boxes with uncut baffles, so now it's "just" to build the speakers and dial them in. (The room also needs lots of attention to be operational -- the final acoustics preparation is still on the drawing table...)
As evident from the drawing below, the system is well suited for experimentation. Apart from the various modes listed in the drawing, the bass bins will be used as distributed subs in a 5.1 setup for experiments with room mode suppression. Finally the monitors might end up flush mounted in "real" cabinets -- if I can convince the Genelec and Geithain camps, that is ;)
Any and all comments and suggestions would be highly appreciated!
Fredrik
X.5 way for "baffle step" compensation
It just occurred to me that the second bass can likely be brought in, such that the "baffle step" is compensated for. Thanks for bringing up the 4435:s.
Furthermore, I have on the roadmap to explore using different tunings of the top and bottom cabinets. Add to this the possibilities for directivity control, and maybe even avoidance of energizing vertical (odd-order) axial modes... :hmm:
Conclusion: Dual 15":s are way cooler than a single 18" ;)
Yep! 4.0 with faux HR-1VF:s it is!
OK, so I've made up my mind: I'll shoot for a 4.0 setup! This route has the additional advantage of making experiments with 4 subs relatively easy since Ls and Rs are almost in the right positions already.
Furthermore, I've decided to take the modularization to the limit and break out the tweeters to separate MDF-frames. Hereby "true" MTM:s are possible, and I can experiment with alternative tweeter positions by putting one frame above the mid-horn and another below and switch on the fly.
I think I'll skip the baffle offset and deal with the edge diffraction hump using other means. Looks is important too! With a symmetric layout and fabric grilles, non-expert visitors will of course think that we've got four Westlake HR-1VF:s (or maybe not... ;) )
This will be fun! There's a second-hand record store close to the office that has an impressive assortment of old quad LP:s... The only thing missing to make the nostalgia trip complete is to cover the walls with fake wooden and stone panels (see this old Tom Hidley room).