I had the same issue and suffered quite a slow download and upload speed. It took me a while but after staying persistent I finally got my service provider to arrange for a tech to come back to my apartment and install a master filter. I am now getting a much better speed. It made a big difference in my case and a master filter was required by my service provider but the Chorus tech I got was too lazy to install it and told me before arriving that I wouldn't be getting one. It's sad when they try to pull fast ones like this. In some cases though, I believe a master filter is not always necessary.