Can you hear the voice of the sea? [Midwoofer enclosure]

[Bicicletta]

Looking for a mid-enclosure with wide beamwidth.

I imagine I should avoid:
walls close to the cone,
parellele walls,
tube-like enclosure,
sphere-like enclosure,
...
Slowly I came to think of a form similar to the mid-box of the B&W 801.
By ear it seems to produce a white noise by a pass-band.
I decided to build the speaker.
Here I share the first steps:

 

[Galu]

If 'sea' is the clue, then all I can say is 'buoy oh buoy'!

 

[PRR]

I absolutely love your shape and molding technique!

What is "wide beamwidth"? 180 degrees? 360 degrees?

180 deg is real easy for a cone on a board, up to where cone diameter becomes significant and beamwidth falls. Is that a 3" speaker? Then it will be 180 degrees to around 1.5KHz, which is high for mid-bass. If put in the end of a tube (as you have done) it will approach 360 deg at 750Hz (and power output falls); if on a board it will be a consistent 180 deg to some low point depending on board size.

 

[Bicicletta]

I had a powerful imprinting in the first 80', and I can't leave 5'' sealed, on a small baffle.
I've tried, but I can't. Only a brief intense betrayal for a dipole in 2010, incompatible with the rules of marriage.

Today's activity:

 

[Bicicletta]

Damping the walls by acetic silicone.
It will be necessary to wash and neutralize after a couple of weeks.

The cylindrical shape of the tail (wrong?) acts as a resonant high Q branch.
Do I need to change it to a cone?

Damping the tail I get my far-resonant cavity.

 

[Bicicletta]

first test with Peerless HDS P830991.
Encouragingly.
FR, 1 channel, at listening point (midfield):

 

[Bicicletta]

by cuts, the flange for tw (Wavecor TW030WA14).
FR, protected by a 10uF capacitor.