I have one of these filters for many years, it really works pretty good.

This is a filter with a 2-way stereo sub output common. It's really what it takes for most applications and it's really cheap! BUT ...
<ul> The biggest problem: the low pass filter (filter for the sub) takes its signal in the Low section AFTER the crossover filters for each channel. In other words, when adjusting the crossover of 44Hz and the filter 'sub' to 200 Hz, the signal for the sub is limited to 44Hz (not 200Hz as it should!) I made a change on mine to fix the thing ... To learn how to: giniaip@birutele.be (remove all "i" in this address the problem of spam!) Or send me a private message stating your e-mail. This is a simple re-routing of the signal, it should not scare those who have used the soldering iron. </ul>

All inputs and outputs are balanced, while XLR3.
Comes in small shallow 1U rack does not heat.