Quick & Dirty Modular Mains

[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

[lfh]

Rob, Widget,

thanks for your advice and encouragement!

As to strategy, I'll work on the room first: We'll do a 5.1 demo (using Genelec 1030A:s), and my stereo demo is optional. I think allocating two days for tuning is a wise idea. Furthermore, I need more time to think over the speaker design before cutting holes I might regret, so I schedule the construction phase for the coming weekend. (BTW, I'll build a dolly and incorporate space for rubber isolators and height adjusters, so the speakers will not rest on rigid stands according to the drawing I posted.)

As to tuning, I'll try to work out as much as possible in the computer first. The baffle layout, "dog house" tuning, crossover design etc certainly needs more work. Even though I plan on using parametric EQ, I want the system to be as well-behaved as possible (as time permits) when running without. The same holds true for the room -- the design will be tested and adjusted virtually first.

I'll post some pics ASAP.

Fredrik

[lfh]

I've posted this picture before but here goes anyway. Given the history of this piece of wall (it comes from now defunkt Polar Studios, once ABBA's private studio), I'll just cut down the existing baffle. This is also in line with the Q&D theme

If someone complains about the looks, the baffle can always be hidden behind a speaker grille (with a hole for the horn, of course).

PS
Hey, Zilch, I hope I'm not infringing a trademark here