Size matters. Just ask your girlfriend. But in the case of the compact Cube-Shaped Speaker from Yamaha, power and presentation trump proportion. This mighty, mini-music box features Swing Radiator bass technology that significantly boosts sound; single-button control (power, mute and volume); an AC adapter and audio cable for stereo jack; and, best of all, it’s less than 3.5 inches on each side. Somehow, we’re sure you can relate. Speakers work with iPod and other portable audio players.