Top speaker performance? RE-MAGNETIZE!

[@gilesdavis6345]

Hi Guido. Another fascinating video, thanks. My vintage tannoys have suffered from a slight volume drop from one speaker possibly due to demagnetisation. Fortunately for me in my middle age I am also suffering from volume loss in one ear. I have simply put the loudest speaker on the side with the worst ear. All the best .❤

[@Mrsteve4761]

Degradation of crossover components should be investigated first, particularly electrolytic capacitors, before suspecting speaker magnetic loss (assuming the Tannoy employ them). But yes, either could be the culprit.

[@alainblazit9504]

Remagnetize your ear!

[@timessquarerecordscom1469]

Very interesting thanks for your hard work

[@karellen00]

Maybe one speaker was near a window were it received sunlight in summer, or close to a radiator, or even a CRT display, who knows! In any case very informative, I already knew this stuff that I even experienced in another field, but somehow it never crossed my mind that even audio gear could be affected

[@BobBasshead]

Thanks for the very informative video. I have a question, I have a pair of Altec model 411-8A that my uncle gave to me many years ago. They need re-foaming but other wise in good condition. What type of magnet is being used in these? Alnico? Thank you for your time.

[@caracine]

Some time ago , when I started building PA systems at a young age, I bought the speakers (Altec/JBL large theater speakers, horns, W-boxes- all horn loaded)) that were being replaced at a venue in Palo Alto, CA. As part of that big system there were a pair of Altec 811-A horns. Those big horns originally came with AlNico compression drivers. The AlNico drivers were quite large as I recall even for a 1" driver. Those drivers were blown (like all the drivers in that big, tired system) so I ended up using Titanium JBL 2426H 1" compression drivers that actually sounded pretty good- even back then. Around here, in the San Francisco Bay Area, Titanium drivers have been much more available than AlNico drivers. This is true back when I was building custom speaker systems in the 80's and 90's. Hope that helps. Cheers!

[@anadialog]

Thanks! Yes Alnico!

[@wramaccorsi1357]

Seeing that demagnetisation does not take place with the ancient field coil speakers, which were the norm back when conventional magnets were not used, in the early days of hifi. Several field coil loudspeakers are making their comeback now, from several brands, and they constitute a very interesting option.

[@be.spiritlove]

Wow very informative - Thanks

[@jman8368]

I hold a stack of neo magnets magnetically opposed in front of the woofers. It works.

[@hoobsgroove]

you can push out the dent I've done it. where it's not even visible u need to use a former

[@chrisf7249]

I’m am also on the Altec road. Your idea about sharing info on where to get this done could be helpful. I’m in Edmonton Alberta and don’t know where would be closest and reasonable to have this done. For $160 I’d like to get my set on 418 and 808 drivers checked and remagnetized if possible.

[@anadialog]

Help the man!

[@birgerolovsson5203]

I use Densen's (and Nordost's since it's the same) demagnetizer CDs and that "signal" works great.

[@dornauge1995]

me too it works wonders!! definitely worth the few bucks

[@dornauge1995]

tho im wondering, the purpose of the demag signal is probably to demagnetize the COIL .... but the magnet sits right beside it... so is this signal demagnetizing the magnet too?

[@birgerolovsson5203]

@

[@shanestephenson8423]

Very interesting Guido. It's a shame about the diaphragm in one of your compression drivers. Hopefully, it won't take too long to find a genuine article somewhere.🎧👌👍

[@chrisf7249]

Personally I think he should keep it and lower that super tweeter crossover to around 7-8k.

[@shanestephenson8423]

@chrisf7249 If I know Guido he will want it fixed no matter what.🙂

[@anadialog]

Ahah!! Yes, in the meantime I found one. Will see if it truly makes an audible difference. The new crossover I ordered has 8Khz and 15Khz filter. I will also see what happens there!

[@Vortexan9804]

How can you remag a 416 without removing the cone assy., can you show how they do it? I think GPA's unit requires the bare magnet, no cone.

[@anadialog]

Did you see the short video inside my video where they remagnetize that huge woofer? No need to remove the cone, just remag the magnet on the other side and on the sides.

[@Vortexan9804]

Question: why can't you push the "dent" out on diaphram?.

[@hi-friaudioman]

I've heard of people using vacuums.

[@anadialog]

I haven’t seen it actually, meaning I don’t know how bad it is, but if Montagna did not do it it’s better to wait for a new diaphragm

[@Error2username]

I cant see who drives their Hifi speakers so hard and hot so they demag, ive had magnets over my oven for over 30yrs and they are still as strong, and those get hot in the winters when i use the oven to warm up the house.

[@anadialog]

As mentioned in the video, that concerns only very small alnico magnets.

[@sitomdd]

no way to measure magnetization at home? I have Altec 414s and 802s, no evident issues but I'm curious. about the new crossover do you mean Werner Jagusch?

[@anadialog]

Don’t think so. Yes, Jagush. I mispronounced his name.

[@anadialog]

Here are what should be the top of the tops in terms of ALTEC crossovers: kzbin.info/www/bejne/oIvIlKSLa9CEgZosi=r1EaryxMs4PiO86V

[@sitomdd]

​@@anadialogwatched that already of course ;) happy with my Jagusch's for now

[@gregmiller3630]

I can't comment on how well Radian's 1228 aluminum diaphragms perform in Altec drivers, but I found their 1225 JBL units sounded significantly better than the original titanium models. You may want to check them out as they're stocked by TLHP in France, and sell for about 95 Euros each.

[@anadialog]

Thanks for the suggestion!

[@d.j.wiendels6572]

If you do this with certain hybrid solutions, (Ferrite/Neodymium ) witch use this to lineairize the field, You'll totally mess up your driver!

[@anadialog]

Thanks for pointing that out. I would hope that who does this professionally will refrain from doing so, two different types of magnet have obviously two types of magnetization. Must be done one at a time but as we have said ferrite and neodymium rarely need to be remagnetized.

[@Badassvidsz]

Excellent video as always dear Guido my best wishes for the New Year 2025 to you and to your relatives, Happy Listenings to always injoy your anazing audio equipment in your fantastic music room and keep uploading these very usefull and informative videos .👍👍👍

[@anadialog]

Efgaristo!

[@Badassvidsz]

@@anadialog Parakalo = you are wellcome .

[@theonl1128]

I've worked in the HiFi world for decades, but never heard of it...sorry. 🤔

[@baggs9445]

Then your not familiar with alnico magnets.

[@chrisf7249]

I’ve only been researching these horn speakers for a few years now, and it’s mentioned lots of places about demagnetizing drivers. Just look up gpa.

[@theonl1128]

@baggs9445 That's correct.

[@Mark-ro5zg]

I haven't either. Just more snake oil!

[@robertorivera1778]

Guido, you do not specify or offer the hot or cold temperatures you talk about. The video is more confusing than helpful. Please be specific because you are causing a lot of stress on many people without any help.

[@chrisf7249]

I thought it was presented well organized clear and concise. I don’t see what you are confused about? He mentioned all the temperatures for any of the magnets relative to audio.

[@anadialog]

Temperatures are mentioned in the video in point 3 but don’t worry, nothing that you will experience at home or in a Studio unless a fire outbreaks or liquid nitrogen hits a speaker ;-)

[@anadialog]

Thanks Chris for your kind words!