Make sure you understand that the length, diameter, and wall thickness of PVC pipes all affect their resonant frequency when exposed to music from speakers.
Unless you have near-perfect isolation between the speakers and their stands, the stands themselves can become excited and “sing along” with the music due to mechanical resonance. In my experience, that’s not desirable, as it introduces coloration and reduces clarity.
Depending on the size (height) of your speakers, you may want to consider commercially built stands. They can be nearly as affordable as DIY PVC tubing stands, but typically offer greater rigidity, stability, and lower resonance—especially when combined with proper isolation. Unless you need larger footprint, this $99 pair of stands won’t cost you an arm and a leg. You could fill sand in them.
