The Canton Ergo 21 DC is a bookshelf speaker model produced by Canton, a German audio equipment manufacturer. It is part of the Ergo series and features a two-way design with a 1-inch aluminum-manganese dome tweeter and a 7-inch aluminum wave surround woofer. The speaker has a frequency response range of 28Hz to 40kHz and a power handling capacity of 130 watts. It is known for its accurate and detailed sound reproduction.