Yes, you're correct, so thanks. I picked up the 1uF caps and when he dropped the speakers off to me, confirmed them to be 1uF. However, one of the speakers was buzzing. Removing the drivers I saw that one of the the fabric surrounds was coming loose, so the cone was off centre causing the coil to rub. I was able to tease it off and re-glue it, making sure it was centred. Replaced the foam sealant as well. All sorted and sounding great again!