Hi all my tempest is done and it is now running! But I would like it crossovered at 50 Hz like my Hsu VTF-3. I compared both of them but Im not able now to tell you all in detail how they do compare, I will do it later :wink: ! I use a Paradigm X-Over so my mains are cut at 50 Hz and I just have to dial the low pass filter to 50 Hz for the subwoofer too. It worked with my VTF-3 because its amp had a defeatable internal crossover so its internal crossover wasnt used at all and it blended beautifully with my mains. But the big problem is that Im not able to do that with the Adire DT300 amp on the Tempest. It features a variable low pass filter from 50 to 150 Hz but even if I turn the button to 50 Hz on my sub plate amp and the same thing with the Paradigm X-Over, I can hear quite a lot of bass above 50 Hz. I dont know what to do, can someone help me?