Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
The dimensions shown in the plan are outside dimensions. The difference in volume between cabinets made with 5/8" or 3/4" material is small and there is much more change caused by the electro-mechanical shift of the woofer at various power levels. If the alignment was so unstable it could be upset by a tiny fractional percentage of interior volume shift, the speaker would sound vastly different at various power levels. So don't get hung up on the small difference of internal volume between various panel thicknesses.