Japanese manufacturer RockridgeSound has announced the VTS-384, another new iPod dock that relies on vacuum tubes instead of transistors. Many audiophiles believe that vacuum tubes produce a richer sound. The 384 can span frequencies between 80Hz and 20KHz, and each of the three-inch internal speakers has 5W of power. The dock can also be connected to headphones or external speakers for greater output. All iPods are supported from the third generation onwards, but remote control functions for third-gens are limited to play/pause and skipping options. The 384 debuts February 2007 in Japan for 80,000 yen ($690).