You Only Need One Of These Cabs -----

[SurferJoe46]

Response down to 17Hz. Now you can REALLY drop tune as far as you want. This is still in the bones and will be finished off with 200 yards of purple Tolex and twenty (20) spring-loaded handles. There is no provision for dolly wheels, but a towbar/hitch and some 245x65R12 tires are the next design item to be tested.

Ahem!

Just kidding - but that is one big mommy of a speaker. It is designed as an adjunct to his Shearer Horn that creates 100,000 Audio Watts.

These are currently working new versions or models of what was originally part of the Universal Picture's Sensurround design process developed by W. O. Watson and Richard Stumpf at Universal.

Four large ultra low frequency Shearer horns were located behind the screen, two in each corner.

The Model W Shearer horn in each corner was 8 ft. long, 4 ft. wide, 4 ft. high and the Model C Shearer horn in each corner was a modular unit only 1 ft. wide and 5 ft. high.

Two additional horns were located on a platform in the rear of the theater. Each horn was driven by a 1000-watt amplifier.

Low cut-off was around 5-40 Hz (cycles) at sound pressures of 110-120 db, causing the audience, chairs, floor to "feel" the vibrations of the earthquake and dam destruction scenes for movies such as "The Battle Of Midway", "Earthquake" and other end-of-world movies.

If you can get the roadies to hump these in and out - imagine what you'd sound like?!?

[Rafael]

Actually two are more practical: That way when you're carrying them one per hand you're balanced....

[billfitzmaurice]

Not to burst your bubble, but a Shearer is only good to 50Hz. It was a fabulous speaker when it won the Motion Picture Academy technical award for sound, but that was 1936. Advancing driver and amplifier technology rendered it obsolete by 1949.
http://www.audioheritage.org/html/pr...co/shearer.htm
The woofers used for the 'Earthquake' Sensurround LF effects were Cerwin-Vegas, larger than, but not dissimilar to, their current folded horns. They only went flat down to 35 Hz or so, but that's an octave lower than the Altec A7s that were the standard theatrical cab of that time period, Shearer's mostly having been long since retired. Enough of them could get usable response to 15Hz, and that meant removing seats, which few theater owners were happy about.

[SurferJoe46]

Originally Posted by billfitzmaurice

Not to burst your bubble, but a Shearer is only good to 50Hz. It was a fabulous speaker when it won the Motion Picture Academy technical award for sound, but that was 1936. Advancing driver technology rendered it obsolete by 1949.
http://www.audioheritage.org/html/pr...co/shearer.htm
The speakers used for the 'Earthquake' Sensurround LF effects were Cerwin-Vegas, larger than, but not dissimilar to, their current folded horns.

I got some mixed messages about the Earthquake/Roller Coaster/Midway speakers too.

Some sites said they were Barcus-Berry Planairs, a flat sheet speaker with about 6-inches of deflection and amp'd over 10,000 Watts each.

I wondered, but trusted the info I got off the Wikipedia, but this pix was about a real group of guys who like to make big speaker cabs and sound systems for a hobby.

Still would be fun to light one of these up at a bar gig somewhere.

[JimmyM]

Originally Posted by SurferJoe46

Still would be fun to light one of these up at a bar gig somewhere.

where would you put the band?

[kesslari]

Originally Posted by JimmyM

where would you put the band?

Inside the speaker, of course!

[dmusic148]

Originally Posted by kesslari

Inside the speaker, of course!

Guy I know plays through an enormous fiberglass Community bin. It's known as the 'Bus Stop.'

[elavate7]

this will blow some ears out! lol

[SurferJoe46]

Originally Posted by JimmyM

where would you put the band?

Too bad for the band! But where would the customers go?

[J-Razz]

Does it come with a forklift for the roadie?

[WOOFMAN]

Would make a cool drum riser.

[SurferJoe46]

Originally Posted by J-Razz

Does it come with a forklift for the roadie?

It comes with hernias for the roadies.

[Growly Lytes]

I can take that to jam & blow the boys out when i ask for a little help to carry it.

[Munjibunga]

... doubles as a workbench.

[Seans]

Originally Posted by kesslari

Inside the speaker, of course!

Funnily enough I know some guys over here that built a horn under his floor of his house it then ran up the wall an exited at the ceiling. They set up to measure how low they could go and got 14hz, it made a magazine back in the 60's too. So they actually did live in the cab.

[T-Bird]

Hi.

Excuse my ignorance SurferJoe, but what are "Audio Watts" ?

As far as folded horns go, the one in the pic isn't that big, and as far as practicality goes, well, do we need to be practical at all times?

Regards
Sam

[KrisH]

Obviously, the sub doubles as the stage . . .

[billfitzmaurice]

Originally Posted by T-Bird

Hi.

Excuse my ignorance SurferJoe, but what are "Audio Watts" ?

He probably means acoustical watts. The 100,000 figure is bogus, with even the most efficient speakers in existence it would take 200,000 electrical watts to create 100,000 acoustical watts.

[lomo]

Originally Posted by Munjibunga

... doubles as a workbench.

as well as bar, stage, and birthing table for pregnant audience members thrown into labor by the brown notes...

[Sundogue]

I bet if they made it out of 1/2" ply (braced of course) and used neo speakers they could get the weight down to a manageable 250 lbs. Then they could put a strap handle on top to qualify as a mini rig of doom