A disastrous subwoofer journey

[Love4sound]

Play around with the distance value for the sub in the AVR and measure for each change a feet at a time, up to 7/8 ft. Pick the distance value with the best looking curve and confirm via listening impressions.

I have experimented all delay values and the best I got was the below as in image 1.Crossover region is smooth and the huge null is there at 100-135 even without the sub engaged as seen in image2 which is the response of only the mains. L and R measured separately gives a good response as seen in image 3

 

[Love4sound]

I guess or I am going to conclude it is SBIR issues. It’s the only logical explanation for this massive dip. With the LCR placed so close to the front wall and Tv,with a huge slab in top and 4-5 inch gap between the wall and TV it becomes a mess for the bass produced by the LCR. Images are old and taken before my new subwoofer placement. When I measure LCR and sub individually the response is very smooth till 200. Only when LR are integrated there are massive dips. So must be SBIR. Tried playing with different delay values and the result is the same. There is no getting rid of the massive dip. Time to make peace with the room limitations.