I have been working out details of my 3-way for some time and doing some measurements and it turns out I need two 10" woofers to meet my goals, It'll be a closed box, the woofers will be in parallel (let's leave aside impedance issues 😉, they will be LP crossed sharp with 4-order at around 200Hz. The front baffle will be ca. 115cm high, the depth around 40cm and the woofers will be more less in the middle of the side speaker wall, one on the left, one on the right, at the same position. Placing them on the side wall makes the box most visually friendly for me but I also find OK the fact that it does not radiate directly to the listener as for the main frequency range I prefer more prominence for smaller drivers (I will use 3" fullranges for the mids).
Are there any significant acoustic drawbacks of such design ?
Are there any significant acoustic drawbacks of such design ?
3" full-range is to small to cover 200Hz at least at high level.
Moreover, you may need to reduce the cutoff frequency below 200Hz for woofers, possibly even below 150Hz, and 150Hz will be even harder to reproduce with a 3" speaker.
The speakers I listen to music on are made by me with only a single 10" speaker and the final cutoff frequency is below 150Hz, around 120Hz. I use a 6" midrange speaker (eminence alpha 6A) and I plan to replace it with a midwoofer because there is a lack in the 100-250Hz area, although the measurements seem to be ok.
Moreover, you may need to reduce the cutoff frequency below 200Hz for woofers, possibly even below 150Hz, and 150Hz will be even harder to reproduce with a 3" speaker.
The speakers I listen to music on are made by me with only a single 10" speaker and the final cutoff frequency is below 150Hz, around 120Hz. I use a 6" midrange speaker (eminence alpha 6A) and I plan to replace it with a midwoofer because there is a lack in the 100-250Hz area, although the measurements seem to be ok.
Not only the cut off freq counts - what is your xover order @ 150Hz ?
Well, I probably did not mention this side issue either that I have 2x 6" to boost the 70Hz - 200 Hz region
I would be happy to get some feedback about the 2x10" woofers side firing if there are no catches that might escape me - there rather few such modern designs (I have seen only some old ARxx somewhere) - do you know any ?
I would not be this autocratic about a contenxtual side topic 😊 I did not say 1x 3" 😉
That's the region responsible for making "power bass" effect. Actually quite tough to make it balanced on par with the rest. I would not hope unless I had strong DSP for that. But accurate measurements for that is not a little boys game ... 😱
Well, I probably did not mention this side issue either that I have 2x 6" to boost the 70Hz - 200 Hz region
I would be happy to get some feedback about the 2x10" woofers side firing if there are no catches that might escape me - there rather few such modern designs (I have seen only some old ARxx somewhere) - do you know any ?
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Using side-by-side 10's is actually an excellent design scheme. You will seriously reduce vibrations that would otherwise be transferred to the enclosure. The result will be a loss of distortion to the point where some folks might think something is missing. This takes care of 1/2 of the equation towards a "quiet box." The other source of possible "vibration" (enclosure walls flexing) is the ballooning effect due to the expansion/compression of air inside the enclosure which corresponds to the woofers' excursion. The ratio of the woofers' displacement verses the overall air contained in said enclosure plays into this. From this, we can conclude the bigger the box, the better, right? Well, one would think. It should be, but not necessarily. The box should NOT be made bigger than it has to be, just to satisfy this. In this case, the stiffness of the walls is paramount. By the way, even though there are 2 parts to this equation, I am of the opinion that the vibrational transfer of the driver unit (in a conventional one woofer system) contributes more towards box coloration, than does ballooning, assuming we are working with a decent enclosure to begin with. This addresses your concern about using twin woofers. There are more aspects of the design to be considered, but I'll just watch this thread to see what happens. Best wishes.
