Quick & Dirty Modular Mains

[lfh]

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

[Robh3606]

If it were me and you were hell bent on using 2 15's I would use 2234's and set up the lowend like a 4435. You would be running a 4 1/2 way. If not I would just use a single 2235 or a 2245 cabinet size permiting.

Rob

[lfh]

If it were me and you were hell bent on using 2 15's I would use 2234's and set up the lowend like a 4435.

Me too -- if I had the drivers. 4 x 2231H is all I have.

Fredrik

[lfh]

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...

Conclusion: Dual 15":s are way cooler than a single 18"

[Robh3606]

Well what ever you do please drop a couple of pictures up here on the site. Looks like it will be a fun project. Good luck with it.

Rob

[Mr. Widget]

Go with whatever you can implement the quickest for your initial audition. When you have the time you should experiment with using the woofers in "helper" mode as well as your pseudo MTM mode.

Schedule your set up so that you have a couple of days to tune the system. To really get the best from a new four-way in a new room, I would expect you will need a week or two of micro dialing-in to really be "there". I would guess you could have something to be proud of with only a couple of days of set up.

Looks like a really nice project. Do keep us posted.


Widget