Esto es lo que me han respondido desde GIK Acoustics después de mandarles el archivo mdat de REW, un plano con las medidas de la sala y ubicación de cajas y punto de escucha y el tratamiento actual:

Thanks for all this. I have studied your results and your pictures. If it was me I would not go for tuned bass traps and the reason for this is that the problems created in that room at this time is mainly due to the axial modes, primarily the length mode. Ideally to treat this you would look at replacing those coloured panels you have on the wall with thick bass traps as you basically have no trapping to counter these lengths modes and it is this that creates some of the biggest problems in the room. Monster traps with a range limiter would be your most effective here. If that is not an option, then you could go the tuned trap way (although they are a little too narrow for the application here) but they would need to sit in the high-pressure points. To find these you need to run the sines in those frequencies and these the room back to front, corners ceiling etc with an SPL metre to find the high-pressure points

Regards

David Shevyn | General Manager | GIK Acoustics Europe | Unit A, Perseverance Mills, Giles Street | Wibsey | Bradford, BD6 3HS