My list of compact subs with room correction.

Adding to the list Syzygy Acoustics SLF870, 12" subwoofer for 1000$ with app and room correction. Interesting device.

I had the Velodyne subwoofer management system but I didn't like the sound of the corrected room. Not sure why. I was in a small room, perhaps the room naturally had it own sound and when you changed it, it was unnatural sounding? I need to investigate that more.

@russ69 what exactly you did not like in that sound? Once I decided to get rid of reflections in my room, bought sound absorbing panels and installed them on a wall behind me. The sound became strictly right, but absolutely dead. Dry and lifeless. I removed two panels and put them behind the speakers and left only one behind my back. And life came back to music plus bass increased. The sound remained normal in technical way but became more musical again. So I made a conclusion that a little reflections are useful for the sound, making it more natural. I’m telling that because I can guess that room correction could make something like that with your sound. Made it too perfect?

@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.

I have had Velodyne and REL subs in the past.  Several Velodyne that died prematurely and a REL r305 that has been rocking for 15 years.  

I set up a second system and it needed a sub.  I put my r305 in that room and was looking for a sub that could keep pace with my Forte IV

I was looking for something cheap,  so I tried the Earthquake MiniMe DSP P12 for $675 shipped from Zacks.   I got the $5 app that allows for Auto EQ.    This sub rocks, I use it with a low , steep crossover and it sounds really good.  Yes it's not a REL or JL but it is pretty damn good for the money.   I've had it about 8 or 9 months and no regrets.