Simple steel tube design Plasma water table

I'm conducing guitar loudspeaker cabinet fabrication technique research (material type/thickness, mechanical joints, adhesives, etc) and how these relate to cabinet/speaker coupling and enclosure resonance with respect to psycho-acoustics. Basically, does one speaker cab sound better than another and why?

Video diary C-Beam XL build with massive steppers and a 1.5kW Chinese spindle.

C-beam Plate Maker V-slot Table System to aid in clamping and setup of jobs.

A practical rotating and stand-alone spool holder which fits any filament extrusion 3D-printer. Several base files provided which make it fit different extruded aluminium profiles.