Hughes & Kettner Era 2 Combo amplifier for acoustic instruments. A combo amplifier combines, as its name suggests, speaker and amplifier in one device and all you need to do is connect it to the power. You can use it for practice at home as well as for rehearsal/recording in a studio or live performances. In this case, it has }2 x 8" speakers and has a power of 400W. See Description & Specifications