In article ,
QuickFix wrote:
Before I fall out with the neighbour completely, I have decided to look
into ways of *cheaply* reducing the volume of the sounds passing through
our shared wall without actually turning the volume of my music down.
Some people have recommended egg cartons, carpet tiles and even hanging
a duvet from the wall, but what I'd like to know is; do any of these
methods actually work?

No.

And if not, can anybody recommend some similarly cheap
alternatives?

There isn't one. If there was a cheap solution, all houses would be built
with excellent sound proofing.

Do a Goggle search on the subject in uk.d-i-y - it comes up regularly.

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*Why is the time of day with the slowest traffic called rush hour?

Dave Plowman London SW 12
RIP Acorn