If you find a pin of the same diameter, you can put another 'mirror image' hole in the other speaker for balance.
Seriously, if it's a paper type cone, you can sand some wood, mix the sawdust with a little wood glue to create a filler paste. Then patch carefully. If need sand lightly and use a dark grey, black or suitably colored marker to blend in the color.
I would practice filling in pin holes in card stock to determine how much glue/dust ratio works best.
Although it sounds like a lot of fuss, if the cone is very smooth, then you don't want to add texture...so best to do as little as possible...you want to have the least amount of effect on resonance/mass/performance.
As mentioned, best to remove the speaker, apply a low stick tape to the back (scotch 811) of the cone, fill the front, lightly smooth/sand (only if needed).
Conversely, you can tape the front and fill the back if the woofer basket allows access. That might look cleaner.
Seriously, if it's a paper type cone, you can sand some wood, mix the sawdust with a little wood glue to create a filler paste. Then patch carefully. If need sand lightly and use a dark grey, black or suitably colored marker to blend in the color.
I would practice filling in pin holes in card stock to determine how much glue/dust ratio works best.
Although it sounds like a lot of fuss, if the cone is very smooth, then you don't want to add texture...so best to do as little as possible...you want to have the least amount of effect on resonance/mass/performance.
As mentioned, best to remove the speaker, apply a low stick tape to the back (scotch 811) of the cone, fill the front, lightly smooth/sand (only if needed).
Conversely, you can tape the front and fill the back if the woofer basket allows access. That might look cleaner.