@russ69 Sounds like you got rid of it so just an FYI. On page 38 of Velodyne’s SMS-1 manual the subject of room equalization is a bit confusing in its black hole description of standing waves.
DSP, room optimization and a -3dB subwoofer itself can simply be overwhelmed when they’re located in a rooms null.
Soon after the SMS-1 the Velodyne Digital Drive Series Manual describe a method of measuring the sub location. By playing the Sweep Tones and using the Mic to measure the sub position visually and note the rooms higher response locations. A sort of tedious and exhausting reverse crawl test.
The results of Velodyne’s Auto EQ are merely a convenient starting point. All of the DD and DD Plus parameters can be manually adjusted to support music genres, poor recordings and or personal taste then saved to memory within their six presets. Turning the remote controlled sub into a handy interactive loudness control.
By the time the DD Pluse was released in 2011 the crawl test now had a name along with multiple You Tube instructions. Unpacking the sub at the listening position and performing the crawl test to locate the rooms modes became the first DD Plus setup instruction and recommended to locate any -3db subwoofers least restrictive performance locations quickly. No room is to small.