Thans Alex. Great to hear your brief but informative summary. I currently use 2 amps, one into a neo the other into ceramic. They sound different but complimentary. I'm glad you mentioned eddy currents, they're an important factor affecting the siZe and direction of forces in electromagnetic systems.

Very informative as always, rapidly becoming my favourite channel to watch

This video inspired me to take the plunge and buy a set of Neodymium speakers for my new guitar amp.. against the wealth of evidence in forums that Neos sound too bright and brittle. This is an opinion mostly formed by KZread comparison demos I imagine. In my experience you need to change your amp settings to account for the higher level of detail in the upper mids and high frequencies when using Neo. If you don't, they sound unusually bright. Unfortunately in the name of keeping things fair most demos keep the same amp settings when changing speakers and end up biasing their results towards the most common speaker type of that demo (usually Ferrite). Neodymium speakers are the perfect choice for those wanting an honest sound out of their amp (my point of reference for my own comparison was EVM12L/G12H vs 18Sound 12NMB420/Mojotone Neo through a Ceriatone SSS using a Strat)

Great video! Thanks

Thank you very much for your coverage of this topic! I enjoyed the way you presented it. It's something I would have liked to investigate more in depth myself. You provide a nice starting point to anybody willing to follow that route.

Incredibly interesting, absolute champion.

I’d love a quantum talk but that gets complicated fast

Right away im reminded of the insane clown possy

And I subscribed today. I appreciate you. I've seen pooninja comment on your chnl and on Dylans. So I'm not the only one ...thanks again.

its one of those`nitty gritty` invaluable ingredients in the whole sequence of creating the key to finding or discovering tones people love, guitarists want that, but probably never consider for a nanosecond what they`dig` about tone, has to be dug up, and processed probably by slave labour blood sweat & tears, ,thanx alex ,, for being so enthusiastic, its truly appreciated 👍

I've used lots of AlNiCo speakers from Weber, and some of their ferro ceramic jobbies. I also use some greenback style Celestions. My subjective experience is that the AlNiCo speakers are brighter and more articulate, and the ceramics are louder and have more bass. In the case of the Celestions, they're MUCH louder. One of my favourite sounds was with two amps: a 5E3 clone running a 12" Celestion greenback, and a Champ clone running a 10" AlNiCo in mono. The sag and compression of the 5E3 contrasted nicely with the stiffer single ended amp. The AlNiCo 10" reproduced lots of attack and detail, while the Celestion thumped and growled. I built a master vol. into the 5E3 to help balance the loudness and it was a glorious combination.

Another good video Alex, and the first time I've heard an attempt to explain these phenomena. You continue to provide a bullshit-free approach to loudspeaker design, entirely in the Barefaced tradition. Looking forward to many more, thanks again!

Alex, that was super informative! I have noticed speaker 'fatigue' when pushing it at prolonging high output levels. I had assumed this was more a thing of alnico speakers but it seems ceramucs are more prone to that. Suffice to say that all the other speaker elements play a big part. Celestion made the alnico blue to go into the Vox ac30 and they are glorious when pushed. Other, Fender old alnicos tended to blow in the early 1960s and often replaced by more robust ceramics. They mightve just been more robustly built and i think the elements of Alnico became scarse. Push a greenback and they get a sag. That IS a certain sound some people like. Another thing to consider is the way an amp's output transformer interacts with a speaker. That push and pull thing. I often use 2 10" drivers, one alnico and one ceramic. They both have their strengths and weaknesses. This for electruc guitar. For bass the mix and match does not work well for obvious reasons.. Thanks again Alex for your deep dives!

@egoncorneliscallery9535

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Sorry for the typos. You cannot edit your post afterwards.

So...heating up your speaker will get you the compression and sag everyone is chasing with turning up tube amps? Is the tone more related to heat than power? This is fascinating! 😁

WAT!? Edit: Ok, on the third listen I got past the confusing bit and into the practical bit, and now I better understand the confusing bit; thank you for this! I love to use Softube's 'Celestion Speaker Shaper' plugin, and now I understand why choosing one of the two different Ferrite options and increasing the 'Boost' leads to a more full, booming sound. It would be interesting to find out whether magnets could be combined in a speaker design. Specifically AlNiCo and Neodymium

L I B. I did not know that AlNiCo Magnets had heat proof character. 🤔

He said quantum and flux!! We're going back - to the future!!!!

@leftyo9589

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only if you have a delorean that can manage 88mph!! LOL

@hoboroadie4623

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@@leftyo9589 I only ever rode in my friend Karla's Deloren in town, and the little five cylinder or whatever it is did sound rather insubstantial, but I never really thought of the era, emissions controls were not quite sorted, were they?

Thanks for doing the math and the hard work for us 😂. #youdaman

I don't think the eddy currents are just "against" the intended movement of the speaker. It is sometimes against it which causes distortion by reducing movement, and it is sometimes with it which also causes distortion by increasing movement ... it muddies the response in both directions. If I remember my physics from several decades ago anyhow.

Alex, thank you very much for your always amazing efforts to deal with insights of physics indeed. Royal Engineers are supposed to greet themselves still with Glasgow handshakes for letting you leave for your civilian career. You are serving the country of finer guitar and bass sounds. I didn't consume all of your lectures, but as far as I remember one bit is always being taken constant: the electricity. Though amps likely work with transformators to mitigate impact of regional voltage and amperage, doesn't this detail influences the reaction of a driver aswell, does it? Is it a proper assumption using the same amp and cab in the USA, GBR or DEU may lead to a slightly different sound?

If you step away from the guitar speaker area and move over to the hi-fi "audiophile" area the debates are the same but with less voodoo logic being employed because BIG money has been spent there to confirm and clarify the behavior of every component of the system used to "reproduce" the sound, but they use amplifiers and cables and speakers and cabinets just like guitarists do.

magnets cant work, and bumble bee's cant fly.