Wouldn’t polyfill reduce the reflections in a sealed box?The closer this is the worse it can wreak havoc.
Basically like the B&W midrange, or the tapered cone on the HiVi dome midrange. I could maybe 3D print a cone.I prefer to have the midrange chamber be that of a triangular format with the edge at the rear-most point so that there is no reflection.
The thing is, when I plugged in 50w to vituixCAD, I originally had 10 liters set aside for the midrange. When I applied the passive crossover from the midrange, the excursion dropped from 4mm@120 to zero. Even with the power turned to 100w, the excursion measured nothing. I kept lowering the box size until I hit parts express’ recommended sealed enclosure size, 1.8L. I had to use a calculated Mms T/S parameter, so I may have to do more digging and redo it. Otherwise, I’m happy to give it a larger box. I read it was the right thing to do.I would recommend at least 5 ltrs for a 6.5" driver, but favor more like 10-15 ltrs.
If I combine these volumes to 5ft^3(141.5L) you’re saying I’m 1.1ft^3(32L!) short of optimal volume? I’ll try some calculations later, but would you say it’s better to enclose and vent them individually or just separate the bass/mids?IME, the 1139 likes about 1.25ft^3 tuned to 25Hz with 2x 2" diameter ports
Wouldn’t polyfill reduce the reflections in a sealed box?
Basically like the B&W midrange, or the tapered cone on the HiVi dome midrange. I could maybe 3D print a cone.
The thing is, when I plugged in 50w to vituixCAD, I originally had 10 liters set aside for the midrange. When I applied the passive crossover from the midrange, the excursion dropped from 4mm@120 to zero. Even with the power turned to 100w, the excursion measured nothing. I kept lowering the box size until I hit parts express’ recommended sealed enclosure size, 1.8L. I had to use a calculated Mms T/S parameter, so I may have to do more digging and redo it. Otherwise, I’m happy to give it a larger box. I read it was the right thing to do.
If I combine these volumes to 5ft^3(141.5L) you’re saying I’m 1.1ft^3(32L!) short of optimal volume? I’ll try some calculations later, but would you say it’s better to enclose and vent them individually or just separate the bass/mids?
Another spitball idea I had from the Statements was open back mids, but I have a lot of relevant reading to do and some consideration to pay to how it will affect box design.
Thanks! The R11 and now R7 are my inspirations for this design. I plan to model better cross bracing, but 3D modeling is hard enough for me right now. Gotta really put in the hours on this next model.It's nice to see you fine-tune between what's reasonable and what's possible. I recognize the same thing, when I did my diy project.
I would advice you add some cross bracing between the sidewalls, because of the depth of the speaker. For some inspiration, look at the Kef R5/7/9/11 crosscut's.
Cubes?Would 2.5 cubes per channel then be doable now that you are not going with a quad?