So you have some money to burn on an expensive set of speakers? These Radial Aircraft Engine Speakers are worth a look. They are inspired by early 20th-century radial aircraft engines. These are made from 6082 aluminum alloy with chrome and 24k gold plated enclosures.
The “Stratospheric Speakers” are driven by “neodymium magnets, two 1″-diam. silk-dome, 25-watt tweeters and four 6 1/2″-diam. PPM-cone, 25-watt mid-range speakers.” They also feature a rear-facing 270-watt active subwoofer. The bad news? Something like this costs you $15,000.