If your subwoofer is louder at the front of the room than at the back, it's probably because it is positioned farther from the listener. The subwoofer's port location has nothing to do with the sound quality, but it does affect the way it's heard. A subwoofer's port location must be able to permit air to circulate freely in order to avoid cancellation and to deliver the proper bass. If possible, try to move the subwoofer a few feet to the front of the room.

If your subwoofer isn't loud enough, check your amplifier and speaker cables. If the amp is working properly, you might have a bad subwoofer cable. A bad Pre-Out jack is another potential cause for a low-pitched sound. To check this, connect a second sub to test it. Otherwise, the problem could be with your amp. In any case, you should check the amp before making any changes.

Another common problem is that your subwoofer is too close to the back of your room. This is the most common cause for this problem. If your subwoofer is too close to the back of your room, you might want to try putting it at the back of the room. The sound quality will be better this way. Also, it's important to test the subwoofer in the back of the room - if it's too close to the back of the room, it won't work as well as it does at the front.