An 11-channel amplifier is an audio amplifier that has 11 separate channels of amplification. Each channel can power a different speaker or set of speakers in a multi-speaker audio system. The most common configuration for an 11-channel amplifier is to have ten channels for the front and rear left and right speakers, the center channel, and a ninth channel dedicated to powering a subwoofer. Additionally, some 11-channel amplifiers may include an additional two channels for front height or overhead speakers, creating a "7.2.4" or "7.2.6" surround sound system.

An 11-channel amplifier can be used in a variety of audio systems, such as home theater systems, professional audio setups, or commercial installations. In a home theater system, the amplifier would be used to power a set of surround sound speakers, a center channel, and a subwoofer, as well as front height or overhead speakers if they are included. In a professional audio setup or commercial installation, the amplifier would be used to power multiple speakers in a large room or venue.

The power output of an 11-channel amplifier can vary, depending on the specific model and manufacturer. However, most 11-channel amplifiers will provide enough power to drive most speakers and subwoofers in a typical home theater or professional audio system. It is important to match the power output of the amplifier to the speakers and subwoofers being used to ensure optimal performance and avoid damage to the equipment.