Basically, it makes it so you can have CLEAN bass and a flat bass response throughout the whole room.
I know you may have heard about how hard it can be to find a good spot in a room for a sub. This is because bass frequencies are very long and create what is known as "peaks" and "valleys" in the frequency graph. These peaks and valleys can change significantly depending on where someone is sitting in a room.
For example, if you sit in the front of the HT, There may be a bass "hole" at 50Hz, which means that in the position you are sitting in the room, you are sitting in a valley of a sound wave (from the reflections off all the walls). You will hear very little bass at the 50Hz frequency. In another seat (let's say the back row) you might have a bass spike at 50Hz, which means that the bass sound at 50Hz is much louder than it should be.
Depending on the combination of bass holes and spikes in certain sitting positions, the bass can sound empty (like something is missing) or bloated (like there is too much bass).
Now, when you set up a sub you try to keep all these hills and valleys to a minimum, but in some rooms it really isn't possible to get a flat bass response for all the seating positions.
When you have two subs, you can have a flatter bass response because you have two positions to work with rather than just one. This allows for the whole room to get a nice, even bass response. There are many strategies out there in placing two subs. You can place one sub in the front of the room, one in the back. You can have the subs in diagonal corners of the room, you can have them against the same wall, etc. Basically, it allows you to have clean, consistent bass throughout the room.
Two subs doesn't really mean louder, it just means cleaner sound.
While I am no expert in the field, I've tried to lay out what I know.
Many of the members on here know a lot more about me on this subject, but I think I got the gist of it.
There are TONS of articles on placing subs and stuff...it really can get complicated.
I hope that helped!
Last edited by danmagicman7; 11/17/06 11:19 PM.
