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Two subwoofers??

I have an MX-700 sub. I love the speed that the twin 8" drivers deliver, but I could use more "impact". I know that this sub is room sensitive, and it has been placed with care, so I am fairly certain that I am getting all I can from the sub. I have been toying with the idea of adding a second MX-700 (my wife does not know this). I know that you can gain up to 6db from a second sub, but I am worried about sound cancellation. My question is this:

Has anyone tried a second sub, and what were the overall effects?

and

For anyone that has a second sub, what placement is the best to avoid sound cancellation?

Love to hear from anyone whose wife is more understanding of this fun hobby.......
skidrhow

Showing 3 responses by sean

sean
6,231 posts
 
Stehno, out of curiosity, do you know where the 18" driver in the Bag End "bottoms out" at ? For the record, it's something like 70+ Hz. They electronically manipulate the signal from there. While their specific approach is slightly different, this can be done with nearly any design. How effective it is depends on how well the designer does their homework. Sean
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sean
6,231 posts
 
I was referring to your comment about an 8" that bottoms out at 30 Hz being a woofer rather than a subwoofer. As i mentioned, the 18" driver in the Bag End actually resonates at 70+ Hz. As you might guess, this makes it worse in "stand alone" performance than many "good" 8" woofers.

The designer chose to use a driver that resonated outside of the audio band that it would actually be used in. This is common practice for most drivers, but is quite rare for a sub. By crossing over below the point of resonance and EQ'ing the response accordingly, he is able to achieve more linear output ( due to the pre-determined sloping output level ) without any in-band resonances or amplifier loading / driver control problems. The major drawback to this is that it takes a LOT more power to do this effectively. Given the ease that one can pick up a high wattage amp nowadays, that factor is almost a moot point though. Sean
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sean
6,231 posts
 
Bottom line ? I like the Bag End. Like anything else though, you have to play with the installation to get best performance from it. Sean
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