Alpair 7 with loose magnet...
 

Today I received my new ordered alpair 7's from Europe Audio.

When I opened the box I saw that one of the speakers had a loose 2nd magnet.

My question:
Can I glue the magnet back on myself, (what type of glue?) or do I have to return them?

greetings, Paul

Yes you can reglue it but it's a little tricky. I would use epoxy and a vice. Remember you have to have the magnet with opposing polarity so it's likely to be a two person job. If the magnet came off it probably took quite a jolt so you might want to make sure everything else is ok and that the original glue job was a weak link. Also look into surface prep before you attempt to glue.

Hey Cal,
Its not opposing polarity; it snaps right into place if I put it back on. I'm sure thats how it's supposed to be, because the cap is still glued to the second magnet.
Also, I'm not so shure about placing a driver made out of plastic in a vice..

greetings, Paul

Hi Paul,
My apologies for this problem. Cal is wrong, there's a quick simple fix.

1 - Use a wire brush to roughen both contact surfaces. You only need to brush for a minute or so. Wipe clean with a soft dry cloth.
2 - Apply a good quality epoxy glue to both surfaces and gently press together. The magnetic tension will do the rest (Don't use a vice as Cal suggests).

This method will make the fix and the driver will perform normally.

Thanks

Mark.

Sorry Mark, not trying to interfere here but I am confused. It's not a bucking magnet? If that's the case, I apologize, the vice is for bucking magnets and should be used with the driver mounted to a temporary baffle and of course protection on the rear. Hence the two persons.

Hi Cal, no worries,

The Alps have attracting magnet systems so its an easy fix (no vice needed). I am contemplating using no glue on this section, giving the guys the choice of non-sheilding or partial shielding. The potential advantage of the non-shield is a slight increase in SPL as the drive-train electrical damping changes; And there's less mass behind the cone inside the box.

The new batch of Alpair 7's have retaining guide lugs built-in to the back of the frame mount so this method is easily possible. More on this when I announce the latest Alp7 in the next week or so.

I'm already running a prototype unit with this option. I'd need to do more testing on this to make sure other performance factors remain stable.

Cheers

Mark.

Useful to know. Cheers Mark.

Yes, thanks Mark.

You might to cover the cone with something while brushing and gluing to protect it from what I call "Jims".

Mark, thanks for the method. I will fix it myself then, no need to send it back.
As to other damage: I can see none. Wonder why it came loose....

Greetings, Paul

Ps. Diyaudio is a amazing place! Where else can you get advice from the man who designed and created the speaker?