When it came time to develop a true professional 15” cabinet, SWR set out to dispel the notion that a 15” was only good for that “old school” dark and muddy tone. The Son Of Bertha provides the roundness and extra fullness you expect from a 15” speaker cabinet, but the speed and clarity of response make it not just any 15”. It’s a true full-range 15” speaker system when used alone, and adds additional bottom end and tonality to any two-speaker system. Deep and round, yet punchy and fast enough for all styles – in other words, it’s the SWR sound in a 15” speaker cab. Or if you like, dial the tweeter out, plug in your P-Bass and go deep