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ADSL speed

ADSL has got me stumped. A couple of months ago, Scarlet (aka Belgacom) claimed that even though my ADSL2 modem synced at around 6Mbps, it wasn't unusual that the maximum downstream data rate was 1Mbps, because of the distance from the modem to the ADSL concentrator apparatus thing. Even though I was very sure that it had been 3+Mbps over a year ago.
Today I notice, from the corner of my eye, the download speed of a virtual appliance I was fetching: 500+ KBps, or a good 5 Mbps. Sync rate of my modem is still 6Mbps.
Was something changed at the Scarlet/Belgacom side ? If yes, why ? Or am I blessed by a unique and unexplained cosmic alignment of some sort ? I just hope it doesn't go down again. Maybe I should keep speedtest.net in my bookmarks.

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