The EV Thiele 1 x 12 ported cabinet plans (from the manufacturer) call for lining cabinet with insulation.
See #11 in the "construction notes:"
http://hf-antenna.com/Flotsam/EV/ElectroVoice_TL806.pdf
I received a copy of these plans from EV back in the early 1990s and built a cabinet (that...
