Should I upgrade to the 1050?

I have a modest sound system.
Yamaha receiver, 100 watts per channel,
5 speaker surround,
100 watt yamaha sub.
I don't listen to music, use it strickly for HT.
I'm thinking about preordering the LFM-1, but wasn't sure if it would over-power my whole system. Would it be too much power?
Also, if I did get the LFM-1, should I keep my other sub, or would having two different brands of subs screw up the effect or something?
Any suggestions would be appreciated.

Oops, somehow screwed up the topic, sorry bout that.

When properly set up (calibrated and such), a good sub should not overpower the rest of a system. Depending on the size of your room, you may not need the Yamaha sub anymore, but you can always experiment with it a bit.

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