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Here's its frequency response (measuring system is flat).
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Yeah, that's not too good a response.
The line driver I use is a Paradigm X-30. It offers about +13dB variable voltage gain along with two subwoofer outputs, one with full phase control. It also allows mono or stereo input and mixes the signals together. It even has three high pass outputs if you need them.
It's only fault I find is that there isn't a bypass switch to defeat the crossover when it's not required, although you can dial it fully clockwise and it takes it past the bass management that most people would use.
I use this device when my processor is in bypass, because the subwoofer signal is a full range analog mix of the left and right channel and requires bass management. When I'm in HT mode I dial the crossover fully clockwise.
Here's a response curve (since we're posting them). The crossover was set at full.
x-30 response.jpg
brucek