6050 or 7150
dont go for new range, its rubbish as per my testing
if u really wanna get low, as in properly
u will need sumthing like 8850, 9850 or 9650 to let u tune that 30hz rumbling bass, the new ranges cut at 50hz which is too high for me atleast
Most importantly , u need a professionally designed box with cross bracing and reinforced well coz lows require tuning and alot of enclosure strength to shine,
any more help if u like, feel free to pm