[Jens Eklund]

Originally Posted by Lewis.

Ah sorry - I thought I had mentioned it but obviously not! My mistake!

Well theres a pretty bad bass null at the listening position, which vansihes when I either stand up, or put my head close to the floor and lean forward a little while seated. Mid and treble are ok, although there's some high pitched echo present when you clap so that needs to be addressed also.

Any help is much appreciated! thanks

The nulls are related to modal issues and perhaps some SBIR. The "flutter" can be addressed with diffusers and/or absorbers. You should make some measurements to be able to verify what the exact problems are and try to understand the behavior of these in order to successfully treat them. This applies especially to the modal response of your room. There are tons of threads in the forum that deals with these questions.

Sincerely Jens Eklund