Nice ...?

(go to Horn speakers) 

http://www.alonbyacarian.com/products/exoticagr_b.htm

May be the speakers you have been waiting for. "only" 120.000 US$

You are bidding on a parabolic horn speaker system designed by Dr. Bruce Edgar and built by Moth Audio of Hollywood, CA. in 2000. This is a furniture grade
system called the Empire, named after its resemlance to the art deco look of the Empire State Building in NYC (see Photos). The Model L-90 left and right channel
speakers use REPS R-1 Ultra Drivers which are extremely efficient (100 dB/ 1 Watt) and are considered the Rolls Royce of full range drivers. The speaker
enclosures are downward firing parabolic horns made with scalloped solid wood with a deep cherry red and black finish. A replica of the statue of the Hollywood
Bowl is located at its base and acts as a sound diffuser. The subwoofer is a 35 Hz Parabolic Horn which uses a downward firing 18 Inch JBL driver. The Finish on
the sub-woofer is identical to the model L-90’s. The Subwoofer comes with a 500 Watt amplifier with internal crossover making it an active sub-woofer. A stereo
Power Amplifier with as little as 2 Watts of power is all that is required to power the system, making it ideal for use with any single-ended triode or other tube
amplifier.

The really big Wisdom Audio Infinite Grande with amps from Rowland Research, digital frontend from Accuphase and cables for Synergistic Research. No - it's not a small man - it's REALLY big speakers!

US$ 600.000, 5100 lbs and 13' 4" high!

http://www.popularmechanics.com/science/extreme_machines/2003/7/loudspeaker/print.phtml

A space shuttle taking off generates 150 dB. It is more than loud. It is outright dangerous. "That large bath of water coming down the side of the main engine when it launches is not for cooling, which is what most people think," explains Rich McKinley, an acoustics expert at Wright-Patterson Air Force Base near Dayton, Ohio. "It is to break up the acoustic waves so they don't damage the shuttle."

Because it is not always practical to launch a space shuttle when you need to create a loud noise--to study airport sound control, for example--Wyle Laboratories, of El Segundo, Calif., has developed a more compact solution, the WAS 3000. It is a powerful 30,000-watt noise source capable of producing up to 165 dB of sound.

Before you begin coveting a WAS 3000 for your home theater, we hasten to point out that technically speaking, the WAS 3000 is a noise generator.

Using a technique called airstream modulation--plus lots of compressed air or nitrogen--it produces pressure fluctuations associated with high-intensity sound. The business end of the device, shown in the photo on the previous page, contains two concentric cylinders, each with rows of modulation slots. Pressure applied from the outside forces gas through the various slots, which change size depending on the magnitude and polarity of an electrical input signal from a high-quality amplifier. This process breaks the airstream into "puffs," which become pressure pulses when they are transmitted into the throat of an acoustic horn that is coupled to the WAS 3000 modulator.

Price 1.000.000 U.S. dollar 

This 12 ton system is fully active with 30kW of amplification, equipped with 24 ultrahigh efficiency planar-magnetic HF-units, 24 15-inch LF drivers and 48 6-inch MF drivers. Placed in a specially prepared subterranean listening room of 45,000 cubic feet, it presents sound with incredible dynamics and limitless power, easily reproducing live concert levels at a distance of 10 meters