For my next project I am going to construct two 75L sonotube based DPL12 subs. I was really interested in doing a dipole sub but the process was looking just a bit too involving and the placement was going to be impractical. So, what I'm planning on doing is making two sealed 75L subs. So I'm thinking that 16" sonotubes 2 feet tall should net me about 80L, subtract driver volume and should be pretty close to 75L. Their use would be 90% music. Until I move out I'll throw them in the corner with my Tempest. I just have some questions about the sonotube enclosures. I'm worried about their weight, is it normal for the enclosures to be very light? I'm also wondering if it would be ok to run the subs in stereo and use them as speaker stands to achieve true stereo bass?