Copper or aluminium basically shove around magnetic flux. There's much more to it. But that is the gist of their purpose. Thickness of the non-ferrous metal, position of the metal is all important. Ass in the shape of the metal that you are trying to force to have a useful flux field within. As an example a copper plated pole, is almost useless. Great for marketing but not for lowering your inductance.
No! That's the entire point of what Steve is posting here. Borresen has no idea what they're doing.
Borresen calls it a 5" inch (I thought about putting a link, but I am not going to do this. Who wants can find specifications of speaker 01).
My guess is, they know quite well what they are doing but what they write [and a good part of what they do] is all about (snake oil) marketing and not about sincere technology.
That is not true. Parts of these speakers are very well engineered. I try to never denegrate people. Michael Borreson if he copied Steve's design still needed to figure it out. That cone is interesting. To say that it's the best? Well best they can do. I have worked with spread tow carbon fiber cones directly with Composite Sounds. I was not so impressed.
Nice! I didn't have this picture.
Well Steve you nailed the under designed part. This is supposed to be a midwoofer, and I see a midrange, spider/damper. One that is really more of a cone tweeter style damper/spider than a damper that is designed for a driver that should support reasonable levels of bass.
Who writes this stuff? There's bits of truth. It's just so much other crap in there that annoys me. Back in the early 80's when I was wet behind the ears reading all this stuff I'd have questions about all these things. But being out in the countryside in rural Canada, good libraries were not an option. I ate all the white papers with a big spoon. Admittedly they were from KEF and B&W and they were actually accurate. Now, we have huge volumes of knowledge and add copy that looks like it was written by AI. The accumulated bovine renderings on the internet that makes people feel they have researched.
That aluminium in the middle is key as well. At least I think it is comparing it to other work I have done. I'll include it, and be able to turn it on and turn it off in the simulations.The same goes for the rear side of the magnets. When you have no steel wicking the flux the magnets behave a little differently than you would expect.
It's critical when you are charging $100 000 for a pair of 2-way loudspeakers. Electrically it is not much different than copper.
I appreciate you asking questions but this might not be the thread for it.
Marginally better conductor. Not enough to matter in 99% of scenarios. Seymour Duncan has a few guitar pickups wound using silver wire and for the life of me I cannot figure out why you would do that. But that's pretty off topic.
Odd that they'd have such a weak suspension. I suppose I've seen something similar-ish on the Neumann KH150, but that's also an active speaker with a pretty aggressive limiter, so not exactly the same idea?
I've built 3D-printed double-reflex speakers, from what I see it seems not. Maybe they didn't render every detail in the cross section view.
