I have a pair of the 2000 signatures. I listened to them the first few years with the grills on and now with them off. They are about 8 years old and I don't have that problem.
Do you have your speakers near a window? Is there direct sunlight on them for part of the day? I am sure that is the problem. Sunlight bleaches out the color over time. Furniture too.
You could try to oil the lighter part of the veneer to try to darken the wood. I suppose if you leave them where they are with the grills off that part will also lighten up over time form the sun. But perhaps the rest of the speaker will too.
By the way, I have seen that same problem on other Proac speakers before with other wood finishes. Not sure why.
Do you have your speakers near a window? Is there direct sunlight on them for part of the day? I am sure that is the problem. Sunlight bleaches out the color over time. Furniture too.
You could try to oil the lighter part of the veneer to try to darken the wood. I suppose if you leave them where they are with the grills off that part will also lighten up over time form the sun. But perhaps the rest of the speaker will too.
By the way, I have seen that same problem on other Proac speakers before with other wood finishes. Not sure why.