I diy’d my speakers-bass reflex and a front loaded horn. Generally, with a ported design I line the walls with .5” wool felt pad and avoid stuffing the enclosure. A sealed design usually utilizes stuffing. Transmission line designs use a very specific amount of stuffing based both on the length of the line and the density of the stuffing. In all cases, bracing is necessary to break up cabinet resonance. As mentioned in another post, some speakers utilize cabinet resonance as an integral part of the design. I think Viking Acoustics does this with their Berlin-R.
Anyone Damp the insides of your Speaker Cabinets?
Do most speakers sound best in cabinets that resonate as little as possible? Why or why not? Is there something any of you have applied to the inside of your speaker cabinets to keep them from resonating, and achieved a more pleasing sounding speaker?