First, I would put the covers back on. I doubt that you are increasing performance by having them off but you are increasing potential damage to your unit and possibly creating a fire hazard.
After you return the lid to its proper place the only entry for dust would be air vents. When not using your pre or amp you can drop a cloth over them to minimize dust settling in. If you do this you will not have an issue with dust.
To remove the dust that is currently there I found that a loose, natural hair painters brush works best.
After you return the lid to its proper place the only entry for dust would be air vents. When not using your pre or amp you can drop a cloth over them to minimize dust settling in. If you do this you will not have an issue with dust.
To remove the dust that is currently there I found that a loose, natural hair painters brush works best.