Pioneer Japan recently presented a cool-looking speakers made of whisky barrel material, the S-A4SPT-VP model. Ignore the confusing model name, instead, take a note that the whisky barrels used by the company are made from century old oak tree and the barrel is used for more than 50 years old. The result is a soft, mellow tone that lingers in the air. Furthermore, since white oak is one of the hardest woods in the world, the speaker cabinet has became extremely rigid. It suppresses unwanted cabinet vibration and enhances the driver’s performance, contributing to the superbly expressive sound.