a bad idea, so are you implying that unlike my post that you copied about a haircut 'correcting' itself in a couple of weeks these speakers are doomed forever ?
On a serious note I doubt very much that these speakers are of the same 'concrete composition' you speak of from the fifties, regardless, I'd love to hear a pair..........
There have been a number of concrete designs over the years, and none have gained any traction. Concrete has changed little since its invention. Modern concrete was invented by Joseph Aspidin in 1824.
GAB did find though, that brick made a good enclosure, and had designs in his DIY books. I know quite a few people built that corner reflex design. You can not manufacture those, they have to be built in situ.
The real issue though is that both sealed and ported enclosures are inherently resonant, by virtue of the physics of the situation.
If you want truly low Q non resonant reproduction then your options are either an aperiodic transmission line, or an exponential horn with a low Q driver, like the Lowthers.
The fact is that truly natural, realistic bass is produced by well designed aperiodic TL speakers. I know as I have enjoyed them for years, and yes, the bass is much better than standard QB4 porting or sealed designs. In the UK there has been a return to manufacturing TL speakers again.
Sqishman has heard the studio TL system and the TL in wall sub system in the great room and he always comments on the quality of the bass.
Those are the ways to obtain natural bass and not concrete enclosures which will still be resonant designs, as I don't think you could make a concrete TL and there would be no point anyway.
