You could however lower it Tolien, he'll get some extra speed out of the line at least. Now you've said you have a DG834 v3 i might have something that will help 
Shamelessly nicked from another forum (but always in my bookmarks when playing with netgear routers):
This command takes whatever SNR setting you have from your ISP and you can set a percentage of it to be used by your router. So if you have a 6db profile and set it to 50% it'll give you a 3db setting. This would mean higher speed but maybe more disconnections, you never know until you've played around with it yourself and see what your connection can handle.
Hope that helps

Shamelessly nicked from another forum (but always in my bookmarks when playing with netgear routers):
First, get the router into debug mode:
http://192.168.0.1/setup.cgi?todo=debug - screen should appear saying ' Debug Enable!'
Then open a command window (Start --> Run... type in 'cmd')
Type 'Telnet 192.168.0.1' (or router address) - A linux busybox connection should be established.
Type 'cd usr/sbin' (cd=change directory)
Type 'ls' (list)
This is the list of commands you have to play with - adslctl is the one you want.
Type 'adslctl' for a list of suffixes
To adjust the SNR set on startup type 'adslctl start --snr xxx' xxx is a number, 130 gives me a nice stable SNR margin of 8 - which allows my SNR to drop at night without disconnecting everything - it is a good workaround until netgear upgrade their firmware.
This command takes whatever SNR setting you have from your ISP and you can set a percentage of it to be used by your router. So if you have a 6db profile and set it to 50% it'll give you a 3db setting. This would mean higher speed but maybe more disconnections, you never know until you've played around with it yourself and see what your connection can handle.
Hope that helps
