Slater
Headphoneus Supremus
When you say bass filters for the ED9, do you mean the duller or the brighter more shiny one? I keep getting confused when people say which one they prefer.
Bass filters are the shiny gold-plated ones. They are a tad shorter, and have a smaller opening at the end. If you look inside of the filter, there's a piece of black foam stuck in.
The other filters (called alto by KZ) are dull (not shiny) brass colored, a tad longer, and have a larger opening at the end. If you look inside of the filter, there's nothing inside (just empty space).
Hope that helps