FIRST of all the amp itself has NOTHING directly to do with the number of DB's you can get. The amount of SPL you achieve has more to do with the driver, enclosure and their installation in relationship to the acoustics of the vehicle than the power you run. To say you saw in this forum that AMP CAN HIT XXX.X DB's is worthless to say. Now, if you're looking to get louder it's possible a re-tune of the port may help, moving the enclosure (not always possible) is another way to increase spl. Put a volt meter on the amp and watch your voltage, if it's dipping very much you may need to rethink your electrical. What we need is this: 1. Tuning of your enclosure. 2. Type of vehicle. 3. Placement in said vehicle. 4. Port/Driver relationship. (i.e. Sub up, port up; sub forward, port forward) This kind of info can help us figure out what your setup really is and what ways that we've seen, used, heard of to improve numbers in your situation. Also, where did your enclosure come from? Is it a pre-fab, you built it, professionally built? There's more reasons than you can fathom as to why numbers go up or down in any given setup. thanks for the quik answer well the tuning of the enclosure is 50hz i got a grand vitara 2004 when i hit my biggest num. the sub was facing foward with the port to the left side of the enclosure and the box was made by me and a friend of mine and about the volt when i hit my best num drop 14.3 to 12.3