I think slam is more of an mid-upper bass thing (80hz-120hz) or maybe even higher sometimes. Below 80hz is mostly shudder and room lock type of bass.
The 1/4 wavelength for these freq's (80-120hz) are shorter than the lower bass wavelengths so are fairly close to the walls. 1/4...3/4...5/4..ect are null points so cancel bass.
Try moving your speaker (or your chair) farther away from the walls...one or both may be placed at a null point.
For instance, the 1/4 wavelength point (null) for 100hz is at 2'10" from the wall.
Pick up a SPL meter
Dave
The 1/4 wavelength for these freq's (80-120hz) are shorter than the lower bass wavelengths so are fairly close to the walls. 1/4...3/4...5/4..ect are null points so cancel bass.
Try moving your speaker (or your chair) farther away from the walls...one or both may be placed at a null point.
For instance, the 1/4 wavelength point (null) for 100hz is at 2'10" from the wall.
Pick up a SPL meter
Dave