Patrick, can you provide details (specs., supplier) and photos of the magnet you added to the A26RE4?
Thanks, Patrick.
Have you measured the resulting change in woofer Qtc and sensitivity?
out of frustration with another project i dusted off some old drivers; seas 25fewx and altec 806/511b, wow this combo sounds so good, why do i even bother building something else i wonder...
What cabinet did you use for the SEAS? Do you have a picture? I also have a few 25few's that I should do something with. I was thinkog of using a good sized sealed squat tower (60~70 liters) but.... what did you do?
it is really not much to see but here you go 😎
the cabs are recycled from an old subwoofer project, 45 liter closed and fully stuffed with dacron fill
25fewx has stronger magnets then 25few so smaller cabs are fine, 70 liters sounds fine for your drivers but even bigger is better for lower Q
compared to what i am used to, this setup releases "tsunamis" of soundwaves, it sounds big and clean, i like it a lot
now i would like to try modern drivers in a similar setup
the cabs are recycled from an old subwoofer project, 45 liter closed and fully stuffed with dacron fill
25fewx has stronger magnets then 25few so smaller cabs are fine, 70 liters sounds fine for your drivers but even bigger is better for lower Q
compared to what i am used to, this setup releases "tsunamis" of soundwaves, it sounds big and clean, i like it a lot
now i would like to try modern drivers in a similar setup
Hi Dave,
Working through the larger sealed cabinet (pg 22) of your file. I wanted to thank you for the plans, and mention that it might be helpful to add a measurement for the depth of the woofer basket cutout in the vertical brace (I approximated it when doing mine) as well as adding the dimension for the top/bottom depth on the cut sheet. LMK if I'm just missing it somewhere!
The depth of the holey brace cutout is purposely left out. This forces you to do measurements to get the right depth. Thta will ensure you take into account the details of material thickness and other details that i can onl guess at. Getting the fit just right is not all that easy.
Top/bottom depth is the same as the inside depth of the box.
dave
Top/bottom depth is the same as the inside depth of the box.
dave
Ahh that makes good sense! Should that brace be tight on the magnet back? or should there be some air between the two?
Getting the brace to just support the basket while not stressing it is not easy. The brace can then distribute the reactive energy of the driver across the baffle, the back, and the top/bottom. Not only is this considerably more material to share the energy, and the iBeam-like structure gretly enhances rigidity.
dave
dave
Excellent! thank you for explaining. I'll dry fit everything, and measure that gap live leaving 1-2mm or so of the magnet to squish onto the brace. just checking that this was the intent of your plan.
I've used the ScanSpeak Aperiodic Vent to good effect. Love the A35!
In the A35 there was only a bit of “cloth” covering the slit that is the aperiodic vent.
Same technique used in some NAIM speakers.
dave
I love this design!70 litres. Mostly finished this AM. Sealed. Aperidic is so you can tame the bass of a too small an enclosure.
Here is a teaser:
dave