We normally run a Digital Designs Z15 woofer in the Boswell's Metro. While getting a facelift to include new upgrades, and changing the face to all platinum we decided for fun to toss in a Powerbass M154 subwoofer. with one Powerbass xta5000d (remember this is a 750 watt subwoofer) we got a high spl of 147.3dB. and the lowest (after 10 rolls) was a 147.1dB not bad... clamped power was 2750 with box rise of 6.6ohm (single 4 ohm woofer).
then i strapped the other Powerbass 5k for a total of two!!! wow... amazingly enough this subwoofer still took the power and 10 rolls later was still kicking!!
the lowest spl score was a 150.7 with a high of a 151.0dB with clamped power at 5330 with box rise of 6.01ohm.
all scores are sealed on dash (legal).
2009 MECA Mid-Atlantic Team of the Year
2010 MECA Mid-Atlantic Team of the Year
48 State Records
22 World Records