I think the LFM-1 is the better sub. It has a similar design to the VTF-2 but it has a larger 12" driver.
Here's a good review on the LFM-1:
http://www.audioholics.com/productre...lawLFM-1_1.php
Here's a good review on the LFM-1:
http://www.audioholics.com/productre...lawLFM-1_1.php