What a beautiful setup.
Did you build those M2x amps? How are they?
Yes, I built those, and a few other amps, both from DIYAudio, and a couple of AudioNoteKits kits. The M2x are very special, offering modular front end daughter cards. I tend to prefer the Mountain View class A cards the most. This was the first set of amps that gave me a sound field that includes front to back visualization as well as side to side.
I have plans to improve the power supply, switching circuit, and black front plates.
I have a small room 9.5x14 feet. And my speakers don’t get much room behind them. I did room treatments in consultation with GIK acoustics.
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My room is less than optional. There is an open hallway near the left speaker, and a window near the right speaker, 3 in a row in fact. I do have a GIK thin panel on the sloping ceiling, and a 4 inch thick 2x8 foot panel on the back wall. According to REW, I still have some 40hz peak, but treating that correctly would use a many of their tuned bass traps. I don’t have enough wall space. Room is 9.5x14 foot.
These speakers are front ported, which helps with putting them closer to the wall. My speakers are currently about 12 inches from the back wall, and 18 inches from side walls. It’s hard to tell on the pictures, but the front baffle is angled toward the listening position, also helping with a small room. My “triangle” is about 7.5 foot in size, so nearfield.
I do use 1-2 dB of balance from my pre to center the sound image, correcting for the open wall on the left. I do have stereo imaging, and have found front to back, as well, with the M2x monoblocks. Ideal, no. Dealing with the hand I’m dealt, in the step down home.
First, I highly doubt their bass traps will treat 40hz, even if you had 20 of them. The only ones that WILL treat that low of a frequency are from Resolution Acoustics who took them to New York to be properly measured. You have some other options. You can place several small subs around the room to balance out the nodes. Also, Spatial Audio used to make a little device which was essentially a subwoofer with a microphone. When it heard a boomy bass node, it sent out a cancellation wave. DSP is another option, but even with the best (DEQX), DSP giveth, DSP taketh away. I know all about boomy bass nodes when I fought with my Wilson Alexia’s for over a year in my room. They had a peak at the same frequency as the worst node in my room. Was a recipe for disaster!
One last thing: move your seating position around a little to see if things improve. Maybe even try the long wall.
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Another option is the Synergistic Research Black Box. Very easy to use as a single or in multiples and can work very well for these issues. I believe they offer a 30 day satisfaction guarantee, so the risk would be minimal.
BlackBox - Synergistic Research