DB Technologies DVA S09 sub vs RCF 905AS sub.m4v

Mini review of the RCF 905AS or RCF 905 AS subwoofer and the DB Technologies DVA S09 subwoofer. Speakers are sometimes judged on youtube by how the sound is in the video. Of course there are far too many variables involved in testing gear this way, and there is simply no substitute for actually physically standing in front of equipment and listening for yourself, but i&got 15 years experience in sound and sound pressure levels, so i&try and explain what the gear is like as quickly and concisely as possible in case you&contemplating decisions similar to those i&had to make when investing in my own gear. I&new to doing reviews and i&sure i&got a lot to learn, but if you have a constructive comment or criticism then i am all ears. I&try and answer questions when i can as well.