Show your stone / marble / concrete loudspeaker box

I always wanted to build a pair.
IMG_5618.jpeg
Thats hilarious. I would definitely want to put some sort of coating on that cinder block, all around the inside. I can only imagine how damaging fine cement dust would be to a drivers mechanical motion.
 
in reminiscence of floor coupled up firing loudspeakers like Sonab I start a new project with a marble enclosure.

i ordered for two subwoofers a pair of marble boxes but got a pair with openings on wrong sides.

Instead of complaining at the stonemason I make now a pair of marble up firing loudspeakers. I did that already:

https://www.diyaudio.com/community/...-firing-speakers.121385/page-175#post-6707993

Drivers I pretty use what I can get - some cheapo drivers which will get a faraday ring, metal foil whizzer cone and aluminium metal foil sandwiched paper cone.

Four "tweeters" per box arranged around the up firing fullrange driver will be used mainly working above 6khz for the indirect/direct/omni sound field.

The box still has to be closed on the downside (misunderstanding with the stonemason) with some rest of stone pieces glued in with silicone.

8cm reflex pipe in 50liter enclosure with 50% white wadding inside.

IMG_20240922_092324.jpg


price point of these galala marble boxes is material and work for 60 dollars a pair in egypt. In egypt stone is cheaper than wood.

size is outside 35 cm x 35 cm x 56 cm, two centimeters thick marble

IMG_20240922_092333.jpg



i wanted reflex ports facing to the bottom.... but got a port on the side


IMG_20240922_092337.jpg



29mm mylar mini speakers, open on the back side will be filtered with 1 uF in 8-8 8-8 ohm arrangement but listening test will show which arrangement will do for the best sound

how to make a whizzer diy:

https://www.diyaudio.com/community/threads/how-to-make-a-whizzer-cone.398063/#post-7643456


how to make own sandwich done diy:

https://www.diyaudio.com/community/threads/how-to-make-a-loudspeaker-sandwich-cone.402917/
 

Attachments

  • IMG_20240922_092751.jpg
    IMG_20240922_092751.jpg
    169.2 KB · Views: 57
  • IMG_20240922_092357.jpg
    IMG_20240922_092357.jpg
    444.1 KB · Views: 57
  • IMG_20240922_092349.jpg
    IMG_20240922_092349.jpg
    437.4 KB · Views: 61
  • Screenshot_20240922_202121.jpg
    Screenshot_20240922_202121.jpg
    81.7 KB · Views: 63
  • Screenshot_20240922_202106.jpg
    Screenshot_20240922_202106.jpg
    80.5 KB · Views: 63
  • IMG_20240922_092441.jpg
    IMG_20240922_092441.jpg
    312.6 KB · Views: 58
frequency response of the 29mm mylar "Kleinlautsprecher" with 1 uF is 6 to 18khz with still some output on 3khz.

The backside of the tweeter is less loud between 8 and 11khz.

A test with closing the backside showed no advantage for the range above 6khz so I leave them open as a dipole.

raw 29mm driver no crossover, it goes down to 400hz

Screenshot_20240922_203528.jpg


(red trace)

next image with 1uF in line

Screenshot_20240922_203503.jpg




measured with spectroid app and white noise as signal