AER Compact 60/4 Tommy Emmanuel Twin Channel Acoustic Combo Amplifier w/OGB - UsedThis AER Compact 60 4 example is a special edition signature model of Certified Guitar Player Tommy Emmanuel. The Compact 60 4 excels at being a lightweight acoustic amplifier that packs a ton of features into a small package. The Compact 60 4 features 60W of power, 2 channels, an FX loop, and 4 on board digital effects. Channel 1 offers a pad and color filter, while Channel two offers a combo jack to either plug a microphone in or another guitar.