6x9 Speaker Boxes

[planet10]

Originally posted by MearCat
Planet10 - You mentioned that to lower the Q response you can drill a series of holes in the box, but I didn't understand how many holes (what is a "area of a third of the Sd of a speaker"??) you should drill and cover/dampen to test the speaker response.

Sd is the piston area of the driver you are using. A 3rd is a ballpark number from my experience. Aperiodic enclosures are still very much a cut & try experience. After the port-lets are made, you then want to damp them by covering them with some resistance, i find compressed fiberglass works well. Sometimes the resistance of the small holes by themselves is enuff -- you have to play.

I just came up from a bit of a listen to some Ampex 517 cabinets that i loaded some accordian surround whizzer cone 6x9s (from out of a Dodge) into (the original drivers were dead). There is something about a FR oval that is really sweet...

dave