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<blockquote data-quote="baaaa1233333" data-source="post: 7237932" data-attributes="member: 630906">My first post on the forum so I&#039;ll try and make it as complete as possible. I have a 2002 330ci with the harman kardon system. I bought an Alpine MRP-M500 amp and an Apline SWR-1243D Type-R 12&quot; DVC sub. I used a Stinger SGN11 line output converter, 4 gauge power and ground, and 8 gauge speaker wire from the amp to the sub (overkill but I orignally was using 18 and I thought that could have been the problem). The sub is wired up at 2 ohms. The problem I&#039;m having is that the sub isn&#039;t loud, like at all. Even when the volumes up the factory system puts out a lot more power than the sub. I think theres a little whine coming from the sub but I&#039;m not sure if it&#039;s still there or not. So the main problem I&#039;m having is that it comes on but does not sound very loud. I had an older car with a cheap setup, 150w P1 and 150W amp and when that sub hit it actualllllllly hit.If someone could help me out that would be great. I&#039;m in Norfolk, VA if anyones local and I live at ODU.</blockquote>

[QUOTE="baaaa1233333, post: 7237932, member: 630906"] My first post on the forum so I'll try and make it as complete as possible. I have a 2002 330ci with the harman kardon system. I bought an Alpine MRP-M500 amp and an Apline SWR-1243D Type-R 12" DVC sub. I used a Stinger SGN11 line output converter, 4 gauge power and ground, and 8 gauge speaker wire from the amp to the sub (overkill but I orignally was using 18 and I thought that could have been the problem). The sub is wired up at 2 ohms. The problem I'm having is that the sub isn't loud, like at all. Even when the volumes up the factory system puts out a lot more power than the sub. I think theres a little whine coming from the sub but I'm not sure if it's still there or not. So the main problem I'm having is that it comes on but does not sound very loud. I had an older car with a cheap setup, 150w P1 and 150W amp and when that sub hit it actualllllllly hit. If someone could help me out that would be great. I'm in Norfolk, VA if anyones local and I live at ODU. [/QUOTE]

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