Loudspeaker enclosure for Markaudio Pluvia 7.2 HD

The Markaudio Pluvia 7.2 HD is arguably one of the best 4" full range speakers out there where you can get away without a crossover or notch filter. See one of the reviews. 

There are multiple suggestions for enclosures on the Markaudio website, but most of them are just a square boxes made of MDF - yawn. So I decided to come up with something which only a 3D printer can produce - a blob curved like an obese pin-up model. Did somebody say a knock off  KEF LS 50 Meta, only weirder?

This enclosure is 5 litres, and tuned for 65Hz, F3 60 Hz. The frequency response plots from my non-anechoic chamber (TV room) are attached, for the speakers solo and also together with my subwoofer design. Due to the curved baffle, the effects or baffle step diffraction will be minimised. Likewise, the absence of any parallel walls will eliminate most standing waves apart form the ones in your room. If you want to play loud, a subwoofer and an amplifier with high pass strongly recommended - the speakers have an Xmax of 4mm and will pump like crazy on Drum&Bass tracks. Can't defy the laws of physics...

There are 2 versions - one with the speaker flush mounted, and one with a front grille to prevent curious little fingers denting the metal cone. See 3rd photo to compare. The frequency response for both versions is almost identical, as my measurements showed. Just make sure the speaker or grille is flush with the enclosure. For the flush mount version, use the thicker 3mm gasket. 

Damping material recycled cotton, all internal walls lined. Or use moving blankets, basically the same stuff only cheaper and you have 11 blankets left over for the next ice age.  

Printed with Sunlu or Jayo (same) matte PLA, get the 5kg spool if you can to make it cheaper and avoid changing the spool mid print. One speaker needs around 1.2kg filament depending on print settings.  Printed with 0.4mm nozzle, back of the speaker on PEI build plate, no support (there will be some loose strings inside on the overhang, who cares), 4 walls, 20% gyroid infill. Fuzzy skin option for outside blends in with the PEI plate pattern. Could use a 0.6mm nozzle for faster printing, tradeoff will be rougher layer lines on the front. 

Heat inserts M4 8.1mm long for the feet, and M3 5.7mm long for the speaker, from our friends at CNC Kitchen or chinese equivalent. And a bunch of M3 and M4 hex bolts of one's tasteful choice. 

Feet are printed with TPU. Positions the speaker straight with the long foot at the rear, or 5 degree upwards with 3 small feet. 

Holes for the terminals are 4mm, for any fancy looking binding post. 

Happy printing.