Are those the only subwoofers you'd consider? Is it the Servo-15 or Servo-15v2?
BTW, here is a punch of measurements on both. I think the guy you talked it was trying to get the sale.
Velodyne DD-18 Frequency response ground plain at 2m.
Velodyne DD-18 Power Compression Magnitude Ref. 85dB..
Velodyne DD-18 Total harmonic Distortion % (sum of harmonics 2 thru 10).
Velodyne DD-18 Group Delay (ms).
Now the Paradigm Servo-15.
Paradigm Servo-15 frequency Response ground plain at 2m.
Paradigm Servo-15 Power Compression Magnitude Ref. 85dB.
Paradigm Servo-15 Total Harmonic Distortion % (Sum of harmonics 2 thru 10).
Paradigm Servo-15 Group Delay.
SheepStar