Speaker cone crease removal

[MoonBassAlpha]

I'm re-foaming the surrounds for a set of hifi woofers for a friend. I've done this a few times now on different models, but these have a crease in one of the (paper) cones. Anyone know of any tricks or tips for sorting this?

cheers

MBA

[fleabag]

Hmm.... a crease is difficult. Dents can be sorted with a vavuum cleaner but a crease - probably permanent

[Phil Starr]

I think you will struggle but if you feel there is nothing to lose try a bit of steam, it'll soften the lignin fibres and maybe even break some of the chemical bonds which tie the fibres together, they'll reform over time and as it dries. It's the process by which wood is bent and it works fairly well on flat paper, a cone is going to be tricky, ideally you'd want a mould to shape the cone onto and a way of clamping it whist it dries in the shape you want. Sounds like a tricky job. good luck.

 

[MoonBassAlpha]

Thanks chaps,  sounds like this one could be "interesting"

[rmorris]

If it's creased but there's no break or tear in the cone then I'd say the acoustic effect will be minimal and recommend leaving as is.

[Count Bassy]

Could you leave the crease but strengthen the area with some glue to prevent it getting worse?

[Bridgehouse]

You could reform as much as you can and then strengthen the crease with a strip of tea bag

[MoonBassAlpha]

Refoaming seems to have gone well, both cones centred ok without rubbing. My friend has now refitted them and is running in gently. I asked if there were any farting sounds, and he said "yes, but they're all coming from me!" (He may have had a few beers at the weekend!)

He does like his bass, and is a little deaf, so we'll see how they fare once he opens them up! I told him to listen and watch out for tears in the cone, but he was running them for a while without any foam at all, so he may not even notice

Thanks for the input folks!

MBA