Room frequency response before/after acoustic treatment

By the way, I have relocated to Europe and I plan on building a proper mastering studio in my garden but in the meantime I managed to get a spare room that works very well for me. The response is great at the sweet spot (and terrible everywhere else). It looks like this:

Wow!!! Looks great man!!

So cool to see people’s project (or pro) studios come together over time.

I don’t recognize those monitors. What are those?

Thanks Jonathan!

Those are HEDD Type 20 MkII monitors which I use in closed port configuration with phase linearizer on, and with the associated subwoofer. Killer monitors for mastering.