Wait until you get a Popeyes chicken sandwich that is still frozen in the middle and see how you like that. It is a very poorly run restaurant chain with massive quality issues.
A useless tube for modern applications unless you need vast amounts of gain and it can't drive low impedance loads unless it has gobs of feedback. Of course this preamp is probably going to have a solid state buffer because it doesn't have enough tubes to be balanced...
What @Curvature said. The thing that I find so annoying is many of these companies that make acoustic panels advertise them as being for sound proofing when in actual fact they are for acoustic treatment for the room they are installed in and not at all for sound proofing.
You can try with your computer. There are a lot of apps that allow independent left/right EQ. At least this will give you an idea of what is possible with headphones.
You'll probably run into issues with headroom (and thus distortion) once you start boosting stuff though, so you need to reduce...
I used to build bridge amplifiers using LM3886 chips. The application was fairly loud background music for bars. I discovered why it was important to use sufficient heatsink compound really quickly - the chip has a rather small piece of real estate to attach to the heatsink. After the magic...
I purchased four of the GIK soffit bass traps and installed them in the corners in my previous space. In that room I had a similar issue, with two modes combining to give a huge 46 Hz peak. They made the peak decay faster but did not attenuate the magnitude in any way. They did, however. improve...
Your speakers are in the front corners and you're sitting closer to the rear wall, so you've created a worst case scenario. Try moving the speakers out of the corners and a little away from the wall behind them.