What Do You Think . . . and How Does It Work?

A bit unrelated but look at his recommendations for speaker placement and how he uses a different speaker placement for a speaker with a different radiation pattern. I think this shows nicely how speaker placement "calculators" are at best approximations and why you need to adjust the speaker (and acoustics if possible) to match the room and speaker.

Must be half a dozen times now I've suggested people build a sub from ABS, lay it on the floor or stand it in a corner. Hsu made a sub for cars that was little more than a pipe with a driver at one end. Its physics- the pipe is a good shape, cheap, easy, and favors the physics of acoustics. On the inside its shape is strong and resists vibration. On the outside its curves diffract and disperse. What's not to like?

i heard these speakers at AXPONA a few years ago.  it was in the madisound room that sells these kits online.  
very incredible deal for the $230 for the kit less the PVC piping.  in this case they used minidsp for the active crossovers.  
sound was deep, rich and had very good bass impact. not the last word in midrange transparency though.  

I’m sorry, and I’m not trying to be a jerk, but they’re pretty dang ugly in my humble opinion.  You asked... I answered!

Didn't HSU make home subs from cylindrical cardboard concrete forms back in the day?