I was running ADSL for a while, using the standard ADSL1 filter/splitter. Ive gone to ADSL2 and am still using the same filter/splitter. Ive heard you can get ADSL2 filter/splitters. Is there an expected difference in the ADSL1 versus the ADSL2 filter/splitters? Im only around 400m from my exchange and max out at around 800kbps, i would have expected more and am thinking I could get better performance by getting the ADSL2 filters/splitter - or are they really the same?