is your box ported? if it is then you dont want to use tones too much lower than that. If you're in a sealed box then you should be ok.
audiobahn by leaps and bounds. however, neither are my favs. good luck
Audiobahn and PowerAcoustic both are really low-end brands. We refer to them and as "AudioBling", cause they're shiny. That's about it. "Friend don't let friends buy AudioBling." Find some name-brand (excluding Sony and Pioneer) on sale. Good Luck!