Originally Posted by Ironmike86
I read the link. Yes I understand it's not hard.
I'm just posting if you have 2 different subs that are similar all you can do is try. Sure the same is probably better but this post make it seem like it would never work.
I'm not alluding to your particular situation, but what would be the point of someone adding a dissimilar sub that could go 5Hz lower than what they currently owned if those extra 5Hz were never properly utilized and were always being produced at a lower output level than they should be relative to what their level would be were the more capable subwoofer used alone? There wouldn't be. It'd be much better to simply use the more capable subwoofer, alone, and hear those extra 5Hz correctly, at the proper output level.
Just because you have 2 subs on hand doesn't mean that you should use them. In almost all cases the extra output that a lesser sub would provide can easily be achieved by simply increasing the output of the more capable sub, used alone, by 3 to 6 dB. This, very obviously, would also raise the volume of that extra 5Hz on the bottom end by 3 to 6dB relative to the level it would have been were both subs used together. That extra 5Hz was one of the main reasons a more capable sub was purchased in the first place. Why pay for it and then, not use it? One single, more capable sub is better than one more capable sub paired with a lesser sub. It's a no-brainer.
Unless you have EQ (or are very, very lucky), there is no way to adjust both subs' levels so that your response is flat beyond the low-end capability of the lesser sub and on down through to the low-end capability of the more capable sub. There just isn't. It's impossible. You can't break the laws of physics.