gita,
I also own the purple fuses and the QSA red fuses for that matter.
I think these tuning discs will give you more bang for the money. It is an instant result, not something you have to let burn in or listen carefully to tell if it is doing something.
It is amazing to me that something so small can do so much. But it does in my system. I guess that is what prompted me to post this thread.
ozzy