It means that the speaker has two drivers to reproduce sound. Typically a 2-way speaker has a “woofer” to reproduce the lower frequencies and a “tweeter” to reproduce the higher frequencies. It usually also contains some electronic components called a “crossover” that sends the lower-pitched sounds to the woofer and the higher-pitched sounds to the tweeter. If the speaker cabinet does not include a cross over, it will almost always have separate sets of terminals on the back to connect to the woofer and the tweeter and the functions of the crossover will be done by electronics outside the speaker enclosure. This type of speaker is called “bi-amped” because it uses separate amplifiers for the low and high frequencies. Some 2-way speakers can use more than two drivers to reproduce the sound. They may have multiple woofers, multiple tweeters, or both. They still only split the frequencies into two bands, though, with all of the tweeters reproducing the same high frequencies and all of the