Hello,\n\nI recently traded in one HSU 15 inch ported subwoofer VTF3 MK5 for two smaller SVS micro 3000's due to space issues. I have it set up in my 5.1 surround sound system. I used a calibration tool called Room EQ Wizard (REW) to get the frequency range for the sub from 20-100Hz as flat as possible. I set the crossover from the 2 main Monitor Audio silver 300's to 80Hz. Now when I play in stereo it seems like I get better and deeper bass when I use the direct mode in my Marantz SR7015. Using the direct mode sets my front speakers to full range vs. crossing over at 80Hz and turns off the subwoofer. Since my Monitor Audios main speakers only go down to about 45Hz I am wondering why when my subwoofer is turned off in stereo mode I get stronger and fuller bass. I always got more bass with the 15 inch ported when it played along with the main speakers.\n\nI am hoping someone has had this experience and can shed some light on why this is happening. I can't believe the 2 SVS micro 3000 subwoofers can't play as deep as my main Monitor audio speakers? In 5.1 movie mode they will shake the sub floor.