It is more difficult to get adhesives to bond to a polypropolene cone than to a standard paper cone. To deal with this, use a Very LIGHT grade sandpaper and scuff the edge of the cone that will attach to the foam to create a better bonding surface for the adhesives.

The Importance of Speaker Placement for Optimal Sound Quality
Speaker placement is more important than many realize. You can’t just drop speakers on a table or shove them against a wall; you have to

