And remember effeciency. they make subs today based on things that they did NOT back in the early 90s.
1. Stiff suspension. In the 90s, subs had moderately weak suspension, thats why the bad ass kicker competition (kicker outline in gold) only handled 300wrms.
2. Effeciency. Look at subs, made today, that people compete with. The effeciency is horrid because they need so much power to move the stiff suspension.
3. Motor Structure/Cooling system. They will tell you that the big motor is to better cool for playing hard for extended periods. Bl-Mfkn-sht. Its to need/use more power.
I've had subs...lets say the Orion XTR2s, for example...outlast some of todays best subs. I had my system at about 65% to 75% for over 6 hours one day, no break. (huge outdoor party) and these subs sounded the same at the beginning as they did after. Now today. I've had 4 Sundown SA15s. They got stinky after 15 minutes of play, and faded hard. Same for DD. So many, SOOOOOO MMMMAAAAAAANNNNNNYYYYY people dont truly know what makes a sub "good" anymore.3
Sure, lets say you got a single 12 that tips 156.6 dB in the kicks. I'd bet after a consecutive hour of play...you MIGHT do 148. They make subs today to burp. Simple as that.
The next sub(s) I buy will be modified to infinite baffle specs and I'll show what can happen on VERY little power. Now, dont take this as me being a dck. Im truly sorry if I come across as that. Its totally not meant to be. But from my limited experience....
Small + Effecient + Vented/Ported = Bass with less power.
Port the stock enclosure and see what happens.