Group delay in subwoofers

Rythmik Audio subs come with a plate amp that includes a continuously-variable phase control. The control allows time-aligning woofers to speakers without physically moving either. The Rythmik PEQ model plate amps also provide both low level connection (on RCA jacks) and high/speaker level (on binding posts).

For real and detailed information go to soundoctor.com and get ready for some serious reading. Super informative and helpful.

I've read it and unless you have the tools and patience to be fanatical about it then you have to live with compromises which are clearly audible.

Jc4659, I spent the last 4 days dealing with sub setup and group delay. My experience was not to use the setup info from the manufacturer.  Did that and it was a waste of time. I did a lot of research and followed the advice given by soundoctor.com and referenced other sources. The first and very important step is proper placement within the environment.  Once I found the sweet spot I again followed manufacturers instruction and again wasted my time. I then followed the instruction by soundoctor.com and finally hit the nail and I'm now loving it. Enjoyed my fully properly integrated sub tonight from 5 to 7 pm. All the tools required were a tape measure, SPL meter and muscle power. Soundoctor.com information rocked my world.

@gillatgh I have the sound Doctor cd with all the low frequencies and have used the out of phase method to find the null zones.  Unfortunately the best location is unacceptable to my wife.  Like I said, it's all about compromises.  Congrats on dialing it in.  You know when it's right.