I've got a nasty dead spot (below 200hz -8db or more) right around my listening position.

If I go and crouch in the corner on either side or somewhere in front of it, all is fine. In fact perfectly balanced which does make me think I might need some EQ also.
I don't really want to use my parametric EQ even though it is very good, as it limits me to using digital playback only and also toslink cables.

So I've decided to treat the problem with bass traps and panels.

I'm just wondering if that will work as if I'm getting the sound I want in the corners of the room where the modes collect, absorbing may not give me any extra bass in my listening position?

I don't really know if the dead spot is because waves are colliding there or because something else is stopping them getting there if that makes sense.

I will be treating the the main two corners behind the speakers with 100 x 30 x 30 bass traps and 50mm panels at various reflection points around the room as well as behind my listening position. Plus some strategically placed bookshelves and storage units of vinyl etc.

I'm hoping for a much improved sound but I'm just wondering if there is anything else I can do to address it?

Room is a weird shape kind of like a plus sign with the speakers in one section of the 'plus' and the listening position at the front of the opposite section.

I did have it sounding better but I moved some stuff around and now can't recreate whatever acoustic effect the 'stuff' was having.

Any advice or suggestions much appreciated.

Cheers,

Chris