Since you only need to work on one plane (speaker's side) you can try the following. LIGHTLY buff with 0000 steel wool. Only trying to slightly dull the gloss finish. Look for Minwax PolyShade (stain and poly in 1) in a matching color, satin finish. Again, very lightly apply the PolyShade. Allow to dry and lightly buff with 0000 steel wool, blending the new finish to old and softening the sheen if necessary. Add more PolyShade as needed.
I've tried this with very good results. Working with only one plane lessens the need for a perfect match to the other planes. Hopefully you can find the correct tint (stain) shade.
Test on a small area, if you don't like it remove with mineral spirits.
I've tried this with very good results. Working with only one plane lessens the need for a perfect match to the other planes. Hopefully you can find the correct tint (stain) shade.
Test on a small area, if you don't like it remove with mineral spirits.