Home Two-Channel Living Area—Really Odd Room

[jupiterboy]

I am at the point of wanting to move forward with some treatments. The issues are pretty clear, and I have worked with positioning many times over the years. I am waiting to get my mic calibrated, but it will be useful for fine tuning as the big issues are not difficult to pinpoint.

I don't have much space for treatment. The space I have is awkward and cramped. I have a 46 Hz (approx.) node that I believe to be a front/back interaction. I can confirm this using some basic room modeling for the right speaker only—isolating the room shape where the seating position is and simulating an absent left wall by indicating heavy treatment.

So have a look and help me understand what I might expect to accomplish with little space to treat. If I should try and attack the primary node with something like a Helmholtz resonator or just do general treatment. Or maybe I just take what I get and live with it. I am open to all ideas.

This is REW modeling using the primary space and only the right speaker. I'm isolating the front/back and floor/ceiling reactions.

This is a pretty accurate rendering of the space. Note that I am pretty sold on filling in behind the couch with bass traps.

This is a REW frequency measurement with a variable filtering. Speaker drivers are right at 1/7th of the way into the room from the front wall.

A spectrogram of the same measurement and placement.

And a waterfall. I have about 45 dB or so of ventilation/street noise.

The actual room. I have noticed I can get an echo from the entry room and/or the stair. The walls are plaster. I can get a custom corner trap for the front right corner. I can get two custom traps behind the couch. There is some wall space directly behind the listening position. The plaster ceiling is going to be a last resort because I'm not a pro with patching and repairing plaster.

[gullfo]

one consideration is building a membrane trap on the center of the back wall to reduce the modal response. maybe start with a MLV type which would be broader band as it's not really tuned, but rather would help to disrupt the pressure. a matching one on the front wall may be needed as well. something like 4' W x 7' H x 5-1/2" D, pink insulation to fill and a 2lb/ft2 MLV attached to the (2x6) frame and left loose (think of a bass drum head hand tightened).