The A 122 is designed as an universal 12" 2-way system and can be used as a fullrange cabinet or with passive subwoofers (e.g. A 151 from the ACUS line)
The A 151 is designed as a direct radiator in a vented cabinet
The A 152 is designed as an universal 15" 2-way system and can be used as a fullrange cabinet or with passive subwoofers (e.g. A 151 from the ACUS line)
The A 153 - a classical design in nearly any cabinet line - is one of the most compact and effective way to solve various sound reinforcement tasks in a convincing manner