most with hd3's tune to 36-40, everyone says those subs behave like they're tuned about 8 hz lower than what they actually are. but with any subs, wow, 25 hz is LOW, cabin gain makes most anything under 30 unnecessary.
yea mark can build a better box than i can..especially one that big..and yes i learned that after making the mistake that anything under thirty is unecessary.
ha thanks..someone gave me the suggestion of using those batteries. and they were 35 dollars a piece..they have 1000 cranking amps and 875 cca..so for 35 dollars i thought it would hold me over until my next install which will be coming soon